Journal articles on the topic 'Neutrino oscillation'
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1
Louis, W. C. "Evidence and Search for Sterile Neutrinos at Accelerators." Advances in High Energy Physics 2013 (2013): 1–14. http://dx.doi.org/10.1155/2013/439532.
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The LSND short-baseline neutrino experiment has published evidence for antineutrino oscillations at a mass scale of ~1 eV2. The MiniBooNE experiment, designed to test this evidence for oscillations at an order of magnitude higher neutrino energy and distance, observes excesses of events in both neutrino mode and antineutrino mode. While the MiniBooNE neutrino excess has a neutrino energy spectrum that is softer than expected from LSND, the MiniBooNE antineutrino excess is consistent with neutrino oscillations and with the LSND oscillation signal. When combined with oscillation measurements at the solar and atmospheric mass scales, assuming that the LSND and MiniBooNE signals are due to neutrino oscillations, these experiments imply the existence of more than three neutrino mass states and, therefore, one or more sterile neutrinos. Such sterile neutrinos, if proven to exist, would have a big impact on particle physics, nuclear physics, and astrophysics and would contribute to the dark matter of the universe. Future experiments under construction or proposed at Fermilab, ORNL, CERN, and in Japan will provide a definitive test of short-baseline neutrino oscillations and will have the capability of proving the existence of sterile neutrinos.
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BILENKY, S. M. "NEUTRINOS: A BRIEF REVIEW." Modern Physics Letters A 19, no. 33 (October 30, 2004): 2451–77. http://dx.doi.org/10.1142/s0217732304015944.
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The major steps in the development of our knowledge about neutrinos are reviewed. The basics of neutrino oscillation formalism is presented. Neutrino oscillations in the framework of three-neutrino mixing are considered. The evidence for neutrino oscillations is discussed. Neutrinoless double β-decay is briefly considered.
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Abdullaeva, Umsalimat, Vadim Shakhov, Alexander Studenikin, and Alexander Tsvirov. "Dirac and Majorana neutrino oscillations in magnetized moving and polarized matter." Journal of Physics: Conference Series 2156, no. 1 (December 1, 2021): 012229. http://dx.doi.org/10.1088/1742-6596/2156/1/012229.
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Abstract In the present paper we develop the quantum theory of neutrino spin and spin-flavour oscillations in moving magnetized matter with a special focus on the effects of matter polarization. We derive an effective neutrino evolution Hamiltonian and corresponding expressions for the neutrino oscillation probabilities. Both the case of Dirac and Majorana neutrinos are considered. From the comparison of the neutrino spin oscillation probabilities in the transversally moving matter for the Dirac and Majorana neutrinos it follows that the oscillation patterns is different for theses two cases. In particular, the conditions for the resonances in these two cases are realized at different densities of matter.
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BILENKY, S. M., C. GIUNTI, and C. W. KIM. "FINALLY NEUTRINO HAS MASS." International Journal of Modern Physics A 15, no. 05 (February 20, 2000): 625–50. http://dx.doi.org/10.1142/s0217751x00000318.
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The present status of the problem of neutrino mass, mixing and neutrino oscillations is briefly summarized. The evidence for oscillations of atmospheric neutrinos found recently in the Super-Kamiokande experiment is discussed. Indications in favor of neutrino oscillations obtained in solar neutrino experiments and in the accelerator LSND experiment are also considered. Implications of existing neutrino oscillation data for neutrino masses and mixing are discussed.
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MA, BO-QIANG. "NEUTRINO OSCILLATIONS: FROM STANDARD AND NON-STANDARD VIEWPOINTS." International Journal of Modern Physics: Conference Series 01 (January 2011): 291–96. http://dx.doi.org/10.1142/s2010194511000420.
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In the standard model of neutrino oscillations, the neutrino flavor states are mixtures of mass-eigenstates, and the phenomena are well described by the neutrino mixing matrix, i.e., the PMNS matrix. I review the recent progress on parametrization of the neutrino mixing matrix. Besides that I also discuss on the possibility to describe the neutrino oscillations by a non-standard model in which the neutrino mixing is caused by the Lorentz violation (LV) contribution in the effective field theory for LV. We assume that neutrinos are massless and that neutrino flavor states are mixing states of energy eigenstates. In our calculation the neutrino mixing parts depend on LV parameters and neutrino energy. The oscillation amplitude varies with the neutrino energy, thus neutrino experiments with energy dependence may test and constrain the Lorentz violation scenario for neutrino oscillation.
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Kajita, Takaaki. "Atmospheric Neutrinos." Advances in High Energy Physics 2012 (2012): 1–24. http://dx.doi.org/10.1155/2012/504715.
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Atmospheric neutrinos are produced as decay products in hadronic showers resulting from collisions of cosmic rays with nuclei in the atmosphere. Electron-neutrinos and muon-neutrinos are produced mainly by the decay chain of charged pions to muons to electrons. Atmospheric neutrino experiments observed zenith angle and energy-dependent deficit of muon-neutrino events. It was found that neutrino oscillations between muon-neutrinos and tau-neutrinos explain these data well. This paper discusses atmospheric neutrino experiments and the neutrino oscillation studies with these neutrinos.
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INOUE, K. "REACTOR NEUTRINO EXPERIMENTS." International Journal of Modern Physics A 19, no. 08 (March 30, 2004): 1157–66. http://dx.doi.org/10.1142/s0217751x04019081.
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Previous searches for neutrino oscillations with reactor neutrinos have been done only with baselines less than 1 km. The observed neutrino flux was consistent with the expectation and only excluded regions were drawn on the neutrino-oscillation-parameter space. Thus, those experiments played important roles in understanding neutrinos from fission reactors. Based on the knowledge from those experiments, an experiment with about a 180 km baseline became possible. Results obtained from this baseline experiment showed evidence for reactor neutrino disappearance and finally provide a resolution for the long standing solar neutrino problem when combined with results from the solar neutrino experiments. Several possibilities to explore the last unmeasured mixing angle θ13 with reactor neutrinos have recently been proposed. They will provide complementary information to long baseline accelerator experiments when one tries to solve the degeneracy of oscillation parameters. Reactor neutrinos are also useful to study the neutrino magnetic moment and the most stringent limits from terrestrial experiments are obtained by measuring the elastic scattering cross section of reactor neutrinos.
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Kisslinger, Leonard S. "Review of neutrino oscillations with sterile and active neutrinos." International Journal of Modern Physics A 31, no. 23 (August 20, 2016): 1630037. http://dx.doi.org/10.1142/s0217751x16300374.
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Recently neutrino oscillation experiments have shown that it is very likely that there are one or two sterile neutrinos. In this review neutrino oscillations with one, two, three sterile and three active neutrinos, and parameters that are consistent with experiments, are reviewed.
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BARGER, V., D. MARFATIA, and K. WHISNANT. "PROGRESS IN THE PHYSICS OF MASSIVE NEUTRINOS." International Journal of Modern Physics E 12, no. 05 (October 2003): 569–647. http://dx.doi.org/10.1142/s0218301303001430.
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The current status of the physics of massive neutrinos is reviewed with a forward-looking emphasis. The article begins with the general phenomenology of neutrino oscillations in vacuum and matter and documents the experimental evidence for oscillations of solar, reactor, atmospheric and accelerator neutrinos. Both active and sterile oscillation possibilities are considered. The impact of cosmology (BBN, CMB, leptogenesis) and astrophysics (supernovae, highest energy cosmic rays) on neutrino observables and vice versa, is evaluated. The predictions of grand unified, radiative and other models of neutrino mass are discussed. Ways of determining the unknown parameters of three-neutrino oscillations are assessed, taking into account eight-fold degeneracies in parameters that yield the same oscillation probabilities, as well as ways to determine the absolute neutrino mass scale (from beta-decay, neutrinoless double-beta decay, large scale structure and Z-bursts). Critical unknowns at present are the amplitude of νμ→νe oscillations and the hierarchy of the neutrino mass spectrum; the detection of CP violation in the neutrino sector depends on these and on an unknown phase. The estimated neutrino parameter sensitivities at future facilities (reactors, superbeams, neutrino factories) are given. The overall agenda of a future neutrino physics program to construct a bottom-up understanding of the lepton sector is presented.
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Pascoli, Silvia, and Thomas Schwetz. "Prospects for Neutrino Oscillation Physics." Advances in High Energy Physics 2013 (2013): 1–29. http://dx.doi.org/10.1155/2013/503401.
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Recently the last unknown lepton mixing angleθ13has been determined to be relatively large, not too far from its previous upper bound. This opens exciting possibilities for upcoming neutrino oscillation experiments towards addressing fundamental questions, among them the type of the neutrino mass hierarchy and the search for CP violation in the lepton sector. In this paper we review the phenomenology of neutrino oscillations, focusing on subleading effects, which will be the key towards these goals. Starting from a discussion of the present determination of three-flavour oscillation parameters, we give an outlook on the potential of near-term oscillation physics as well as on the long-term program towards possible future precision oscillation facilities. We discuss accelerator-driven long-baseline experiments as well as nonaccelerator possibilities from atmospheric and reactor neutrinos.
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Zhang, Jinnan. "JUNO Oscillation Physics." Journal of Physics: Conference Series 2156, no. 1 (December 1, 2021): 012110. http://dx.doi.org/10.1088/1742-6596/2156/1/012110.
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Abstract The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kton multi-purpose liquid scintillator detector with an expected 3 % / E [ Mev ] energy resolution, under construction in a 700 m underground laboratory in the south of China (Jiangmen city, Guangdong province). The exceptional energy resolution and the massive fiducial volume of the JUNO detector offer great opportunities for addressing many essential topics in neutrino and astroparticle physics. JUNO’s primary goals are to determine the neutrino mass ordering and precisely measure the related neutrino oscillation parameters. With six years of data taking with reactor antineutrinos, JUNO can determine the mass ordering at a 3-4σ significance and the neutrino oscillation parameters sin2 θ 12, Δ m 21 2 , and | Δ m 31 2 | to a precision of better than 0.6%. In addition, the atmospheric neutrino and solar neutrino measurement at JUNO can also provide complementary and important information for neutrino oscillation physics. This work focuses on the oscillation physics of JUNO, which includes measurement and analysis of the reactor neutrinos, the atmospheric neutrinos, and the solar neutrinos. With the delicate energy response calibration and event reconstruction potential, JUNO will make a world-leading measurement on the neutrino oscillation parameters and neutrino mass ordering in the near future.
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Pestel, V., Z. Aly, and L. Nauta. "Analysis of the first KM3NeT-ORCA data." Journal of Instrumentation 16, no. 11 (November 1, 2021): C11010. http://dx.doi.org/10.1088/1748-0221/16/11/c11010.
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Abstract ORCA, Oscillation Research with Cosmics in the Abyss, is the low energy KM3NeT neutrino underwater detector, located in the French Mediterranean Sea. It comprises a dense array of optical modules designed to detect Cherenkov light emitted from charged particles resulting from neutrino interactions in the vicinity of the detector. Its main physics goal is the determination of the neutrino mass hierarchy by quantifying the matter-induced effect on the oscillation probabilities of atmospheric neutrinos in the energy range, 3–50 GeV, where the effects of neutrino oscillation phenomena are dominant. In 2019, four detection units were operational. Two more had been added in early 2020. This work presents an overview of the detector performance in the 2019 configuration, as well as its sensitivity to neutrino oscillations.
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Nakarmi, Prabandha, and Jeevan Jyoti Nakarmi. "Significance of neutrino-neutrino interaction in neutrino oscillation in core-collapse supernova." BIBECHANA 12 (December 17, 2014): 89–95. http://dx.doi.org/10.3126/bibechana.v12i0.11780.
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We study the possibility of neutrino-neutrino interaction inside the neutrino core of supernova (ρ ≥ 1010 g/cc) and outside the neutrinosphere. The angular dependence of the neutrino-neutrino interaction Hamiltonian causes multi-angle effects that can lead either to oscillation or free streaming of neutrinos. If the angle between interactions is π/2, the neutrinos are trapped inside neutrino core and chances of oscillation increases due to interaction. As the angle gradually changes, the chance of oscillation decreases and free streaming of neutrino can be observed out of core of supernova as shock waves.DOI: http://dx.doi.org/10.3126/bibechana.v12i0.11780 BIBECHANA 12 (2015) 89-95
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Ternes, Christoph Andreas. "CPT violation in neutrino oscillations." Journal of Physics: Conference Series 2156, no. 1 (December 1, 2021): 012108. http://dx.doi.org/10.1088/1742-6596/2156/1/012108.
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Abstract In this talk I consider CPT violating neutrino oscillations in its most general form, i.e. assuming different oscillation parameters for neutrinos and antineutrinos. In this scenario the measurement of oscillation parameters is much more difficult than in the standard case. I will discuss the implication on the recent CP measurements in T2K and NOυA, and also discuss how well current experiments can bound different neutrino and antineutrino parameters. Finally, I will discuss how well the upcoming DUNE experiment might improve the current bounds.
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Upadhyay, A., and M. Batra. "Phenomenology of Neutrino Mixing in Vacuum and Matter." ISRN High Energy Physics 2013 (February 13, 2013): 1–15. http://dx.doi.org/10.1155/2013/206516.
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The current status and some perspectives of the phenomenology of massive neutrinos is reviewed. We start with the phenomenology of neutrino oscillations in vacuum and in matter. We summarize the results of neutrino experiments using solar, atmospheric. The fundamental theory of flavor changing neutrinos that has confirmed the neutrino oscillations and the various parameters affecting these oscillations have been discussed in detail. Specifically we will take the solar and atmospheric neutrino case. The oscillation plots will be discussed in detail, based on their behavior in vacuum and matter. Both normal and inverted mass hierarchy hypotheses are tested and both are consistent with observation. Finally the sensitivity of theta 13 over these probability oscillations has been analyzed and commented.
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Quek, Zhi Hao, Wei Khim Ng, Aik Hui Chan, and Choo Hiap Oh. "Nonlinear Dirac Neutrino Oscillations." EPJ Web of Conferences 240 (2020): 07010. http://dx.doi.org/10.1051/epjconf/202024007010.
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Neutrino oscillations are a possible way to probe beyond Standard Model physics. The propagation of Dirac neutrinos in a massive medium is governed by the Dirac equation modified with an effective Hamiltonian that de- pends on the number density of surrounding matter fields. At the same time, quantum nonlinearities may contribute to neutrino oscillations by further mod- ifying the Dirac equation. A possible nonlinearity is computationally studied using Mathematica at low energies. We find that the presence of a uniform, static background matter distribution may significantly alter the oscillation am- plitude and wavelength; the considered nonlinearity may further reduce both oscillation amplitude and wavelength. In addition, the presence of matter al- lows the effects of the nonlinearity to be more readily observed for the chosen background densities and neutrino energy.
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Agarwalla, Sanjib Kumar. "Physics Potential of Long-Baseline Experiments." Advances in High Energy Physics 2014 (2014): 1–29. http://dx.doi.org/10.1155/2014/457803.
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The discovery of neutrino mixing and oscillations over the past decade provides firm evidence for new physics beyond the Standard Model. Recently,θ13has been determined to be moderately large, quite close to its previous upper bound. This represents a significant milestone in establishing the three-flavor oscillation picture of neutrinos. It has opened up exciting prospects for current and future long-baseline neutrino oscillation experiments towards addressing the remaining fundamental questions, in particular the type of the neutrino mass hierarchy and the possible presence of a CP-violating phase. Another recent and crucial development is the indication of non-maximal 2-3 mixing angle, causing the octant ambiguity ofθ23. In this paper, I will review the phenomenology of long-baseline neutrino oscillations with a special emphasis on sub-leading three-flavor effects, which will play a crucial role in resolving these unknowns. First, I will give a brief description of neutrino oscillation phenomenon. Then, I will discuss our present global understanding of the neutrino mass-mixing parameters and will identify the major unknowns in this sector. After that, I will present the physics reach of current generation long-baseline experiments. Finally, I will conclude with a discussion on the physics capabilities of accelerator-driven possible future long-baseline precision oscillation facilities.
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SHUKLA, P. K. "Amplification of neutrino oscillations by a density ripple in dense plasmas." Journal of Plasma Physics 77, no. 3 (January 21, 2011): 289–91. http://dx.doi.org/10.1017/s002237781000070x.
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AbstractIt is shown that a pre-existing electron density ripple in a dense plasma can excite electron neutrino oscillations. For our purposes, we use the dispersion relation for neutrino oscillations and derive the Mathieu equation for the propagation of neutrino oscillations in the presence of a spatially oscillating electron density ripple. The Mathieu equation predicts instability of neutrino oscillations. The criterion under which instability occurs is presented. Analytical expressions for the neutrino oscillation frequency and the growth rate are obtained. The possible relevance of our investigation to non-thermal neutrino oscillations in dense plasma environments (e.g. the supernovae, the core of white dwarf stars etc.) is briefly mentioned.
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Johns, Lucas. "Neutrino oscillations in a trapping potential." International Journal of Modern Physics A 34, no. 28 (October 10, 2019): 1950160. http://dx.doi.org/10.1142/s0217751x19501604.
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A number of derivations of the standard neutrino oscillation formula are known, each one providing its own unique insights. Common to all treatments is the assumption that neutrinos propagate freely between source and detector, as indeed they do in all experiments thus far conducted. Here, we consider how neutrinos oscillate when contrary to the usual setup, they are bound in a potential well. The focus in particular is on nonrelativistic neutrinos with quasi-degenerate masses, for which oscillations in free space are described by the same formula, to lowest order, as relativistic neutrinos. Trapping these particles engenders corrections to their oscillation frequencies because the interference terms are between discrete energy levels rather than continuous spectra. Especially novel is the frequency shift that occurs due to the dependence of the energy levels on the mass of the neutrino: this part of the correction is nonvanishing even in the extremely nonrelativistic limit, reflecting the fact that the neutrino mass states have different zero-point energies in the well. Building an apparatus that can trap neutrinos is a futuristic prospect to say the least, but these calculations nonetheless shine a light on certain basic aspects of the flavor-oscillation phenomenon.
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Anchordoqui, Luis A. "Using Neutrino Oscillations to Measure H0?" Universe 8, no. 7 (July 11, 2022): 377. http://dx.doi.org/10.3390/universe8070377.
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Recently, the idea of using neutrino oscillations to measure the Hubble constant was introduced. We show that such a task is unfeasible because for typical energies of cosmic neutrinos, oscillations average out over cosmological distances and so the oscillation probability depends only on the mixing angles.
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MAJUMDAR, DEBASISH, AMITAVA RAYCHAUDHURI, KAMALES KAR, ALAK RAY, and FIROZA K. SUTARIA. "OSCILLATION EFFECTS ON NEUTRINOS FROM THE EARLY PHASE OF A NEARBY SUPERNOVA." International Journal of Modern Physics A 15, no. 14 (June 10, 2000): 2105–20. http://dx.doi.org/10.1142/s0217751x00000872.
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Recent observations of atmospheric and solar neutrinos strongly support the phenomenon of neutrino oscillations — a manifestation of a nonzero and nondegenerate mass spectrum. Neutrinos emitted during stellar core collapse leading to a supernova are of the electron neutrino type at source — as for solar and reactor (anti-)neutrinos — and provide another useful tool in the search for flavor oscillations. Their propagation to an earth-bound detector involves length scales that can uniquely probe very small neutrino mass differences hitherto unobservable. Although the number of neutrinos emitted during the collapse phase is much smaller than that emitted in the post-bounce epoch (in which all flavors of neutrinos are emitted), a nearby supernova event may nevertheless register a substantial number of detections from the collapse phase at SuperKamiokande (SK) and the Sudbury Neutrino Observatory (SNO). The measurement of the fluence of these neutrinos at SNO and the distortion of the spectrum detected at SK can yield valuable information about neutrino mass difference and mixing which are illustrated here in terms of two- and three-flavor oscillation models. In particular, we find that R SNO , the ratio of the calorimetric detection of the neutrino fluence via the neutral current channel to the total energy integrated fluence observed via the charged current channel at SNO, is a sensitive probe for oscillations. We also find that αn, the ratio of the nth central moments of the distributions seen at SK and SNO (charged current), can be a useful tool (especially for n=3) to look for neutrino oscillations.
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Lu, Jianlong, Aik Hui Chan, and Choo Hiap Oh. "A Phenomenological Model of Effectively Oscillating Massless Neutrinos and Its Implications." EPJ Web of Conferences 240 (2020): 02002. http://dx.doi.org/10.1051/epjconf/202024002002.
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We discuss an alternative picture of neutrino oscillation. In this phenomenological model, the flavor-changing phenomena of massless neutrinos arise from scattering processes between neutrinos and four types of undetected spin-0 massive particles pervading throughout the Universe, instead of neutrinos’ own nature. These scattering processes are kinematically similar to Compton scattering. One type of left-handed massless sterile neutrino is needed in order to reproduce the neutrino oscillation modes predicted in the theory of neutrino mixing. Implications of our model include the existence of sterile neu- trinos, the nonconservation of active neutrinos, the possible mismatch among three neutrino mass squared differences ∆m2ij interpreted in the theory of neutrino mixing, the spacetime dependence of neutrino oscillation, and the impossibility of neutrinoless double beta decay. Several important open problems in neutrino physics become trivial or less severe in our model, such as the smallness of neutrino masses, neutrino mass hierarchy, the mechanism responsible for neutrino masses, and the Dirac/Majorana nature of neutrinos.
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Chakraborty, Madhurima. "Dense neutrino oscillations : beyond two flavor." Journal of Physics: Conference Series 2156, no. 1 (December 1, 2021): 012106. http://dx.doi.org/10.1088/1742-6596/2156/1/012106.
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Abstract In a dense supernova environment, neutrinos can undergo flavor conversions known as the collective oscillations. These self induced neutrino flavor conversions (collective oscillations) are almost exclusively studied in the standard two flavor scenario. We study these oscillations in the complete three flavor scenario. The ‘fast’ conversions are fascinating distinctions of the dense neutrino systems. In the fast modes the collective oscillation dynamics are independent of the neutrino mass, growing at the scale of the large neutrino-neutrino interaction strength (105 km−1 ) of the dense core. This is extremely fast, as compared to the usual ‘slow’ collective modes driven by much smaller vacuum oscillation frequencies (100 km−1). We perform the first non-linear simulations of fast conversions in the presence of three neutrino flavors which is motivated from the recent supernova simulations with muon production. We relax the standard ν μ , τ = ν ¯ μ , τ (two-flavor) assumption. Our results show the significance of muon and tau lepton number angular distributions, together with the traditional electron lepton number ones and thus explain the need for a complete three flavor analysis.
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Goswami, Srubabati, Amitava Raychaudhuri, and Kamales Kar. "Accelerator, Reactor and Atmospheric Neutrino Data: A Three-Flavor Oscillation Analysis." International Journal of Modern Physics A 12, no. 04 (February 10, 1997): 781–99. http://dx.doi.org/10.1142/s0217751x97000621.
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We perform a three-flavor oscillation analysis of accelerator, reactor and atmospheric neutrino results. Motivated by the experimental data, the mass squared differences are chosen to be Δ12 = Δ13 in the range 0.5–10 eV2 and Δ23 = 10-2 eV2. In such a scenario, the oscillation probabilities for the accelerator and reactor neutrinos involve only two of the mixing angles and one mass scale. But the atmospheric neutrino oscillation is governed by both mass scales and all the three mixing angles. The greater latitude allowed by the scheme leads to some new and interesting solution regions for atmospheric neutrinos in addition to the two-flavor limits usually discussed. However, incorporating the constraints from the previous accelerator searches for neutrino oscillations, a very narrow range of allowed mixing angles survives. This zone is beyond the reach of the on-going accelerator experiments CHORUS and NOMAD with their projected sensitivity.
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Brunner, Jürgen. "Measurement of Neutrino Oscillations with Neutrino Telescopes." Advances in High Energy Physics 2013 (2013): 1–16. http://dx.doi.org/10.1155/2013/782538.
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IceCube and ANTARES are the world-largest neutrino telescopes. They are successfully taking data, producing a wealth of scientific results. Whereas their main goal is the detection of cosmic neutrinos with energies in the TeV-PeV range, both have demonstrated their capability to measure neutrino oscillations by studying atmospheric neutrinos with energies of 10–50 GeV. After recalling the methods of these measurements and the first published results of these searches, the potential of existing, and planned low-energy extensions of IceCube and KM3Net are discussed. These new detectors will be able to improve the knowledge of the atmospheric neutrino oscillation parameters, and in particular they might help to understand the neutrino mass hierarchy. Such studies, which use atmospheric neutrinos, could be complemented by measurements in a long-baseline neutrino beam, which is discussed as a long-term future option.
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Giunti, Carlo, and Thierry Lasserre. "eV-Scale Sterile Neutrinos." Annual Review of Nuclear and Particle Science 69, no. 1 (October 19, 2019): 163–90. http://dx.doi.org/10.1146/annurev-nucl-101918-023755.
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We address the phenomenology of light sterile neutrinos, with an emphasis on short-baseline neutrino oscillations. After reviewing the observed short-baseline neutrino oscillation anomalies, we discuss the global fit of the data and the current appearance–disappearance tension. We also review briefly the effects of light sterile neutrinos in β decay, neutrinoless double-β decay, and cosmology. Finally, we discuss future perspectives of the search for the effects of eV-scale sterile neutrinos.
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LIU, T. C., KWANG-CHANG LAI, and GUEY-LIN LIN. "NEUTRINO FLAVOR RATIOS ON THE EARTH FOR DECAY AND OSCILLATION SCENARIOS." Modern Physics Letters A 28, no. 02 (January 20, 2013): 1340005. http://dx.doi.org/10.1142/s0217732313400051.
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Due to flavor transition mechanisms in neutrino propagations, both neutrino oscillation and decay, neutrinos flavor ratio at astrophysical sources can quite different from observed ratios on the Earth.1 We use the recent global fitting result of the mixing angle values2 to determine the allowed neutrino flavor ratios on the Earth for standard neutrino oscillation and general decay mechanisms. In this analysis, four types of the neutrino decay mechanisms can be distinguished from the oscillation case easily with arbitrary initial neutrino flavor ratio and the other four types of neutrino decay mechanisms can be distinguished from the oscillation case with the specified source. The rest types of neutrino decays strongly overlap with the oscillation and cannot be identified.
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Wagner, D. J., and Thomas J. Weiler. "Neutrino Oscillations from Cosmic Sources: A Nu Window to Cosmology." Modern Physics Letters A 12, no. 33 (October 30, 1997): 2497–501. http://dx.doi.org/10.1142/s0217732397002624.
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Neutrino astrophysics promises a wealth of information about neutrinos and the history of the universe through which they have traveled. In this letter, we extend the standard neutrino qoscillation discussion to neutrinos propagating through expanding curved space. This extension introduces a new cosmological parameter in the oscillation phase. The new parameter ℐ records cosmic history in much the same manner as the redshift variable z or the apparent luminosity distance DL. Measuring ℐ through neutrino oscillations may help to determine cosmological parameters and distinguish between different cosmologies.
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GOLDMAN, T. "STERILE NEUTRINOS IN A 6 × 6 MATRIX APPROACH." International Journal of Modern Physics A 22, no. 27 (October 30, 2007): 4967–78. http://dx.doi.org/10.1142/s0217751x07038323.
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Quark-lepton symmetry invites consideration of the existence of sterile neutrinos. Long ago, we showed that this approach predicts large neutrino mixing amplitudes. Using a Weyl spinor approach, we show, in an analytic example, how this, and pseudo-Dirac pairing, can develop within a reduced rank version of the conventional see-saw mechanism, from small intrinsic mixing strengths. We show by numerical examples that mixing of active and sterile neutrinos can affect the structure of oscillations relevant to extraction of neutrino mixing parameters from neutrino oscillation data.
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Luo, Shu. "Search for direct and indirect unitarity violation in neutrino oscillation experiments." International Journal of Modern Physics A 29, no. 21 (August 20, 2014): 1444006. http://dx.doi.org/10.1142/s0217751x14440060.
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If three standard neutrinos mix with other degree of freedoms like sterile neutrinos, no matter how heavy the sterile neutrino masses are, it could result in the unitarity violation in the MNSP matrix. Nevertheless, the unitarity violation induced by the existence of light or heavy sterile neutrinos can have very different effects on neutrino oscillations, we call the former case direct unitarity violation and the later case the indirect unitarity violation. We will explain in this paper the difference of these two kinds of unitarity violations, then focus on the possibilities of searching the unitarity violation in neutrino oscillation experiments, of which the precision reactor experiments with multiple baselines are discussed in detail.
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Archidiacono, Maria, and Stefano Gariazzo. "Two Sides of the Same Coin: Sterile Neutrinos and Dark Radiation, Status and Perspectives." Universe 8, no. 3 (March 10, 2022): 175. http://dx.doi.org/10.3390/universe8030175.
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The presence of light sterile neutrinos is one of the unanswered questions of particle physics. The cosmological counterpart is represented by dark radiation, i.e., any form of radiation present in the early Universe besides photons and standard (active) neutrinos. This short review provides a comprehensive overview of the two problems and of their connection. We review the status of neutrino oscillation anomalies, commenting on the most recent oscillation data and their mutual tensions, and we discuss the constraints from other terrestrial probes. We show the shortcomings of translating light sterile neutrinos in cosmology as additional thermalised relativistic species, produced by neutrino oscillations, and we detail alternative solutions, specifically focusing on neutrino nonstandard interactions, and on their link to the Hubble constant problem. The impact of a new force leading to dark radiation–dark matter interactions is also discussed in the realm of new physics in the dark sector.
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Jean-Jacques, Kendra, Anna Roland, Christelle Billan, and Preet Sharma. "A Review on Neutrino Oscillation Probabilities and Sterile Neutrinos." Emerging Science Journal 6, no. 2 (March 9, 2022): 418–28. http://dx.doi.org/10.28991/esj-2022-06-02-015.
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In the past decades, there have been many groundbreaking discoveries and advancements in the field of particle physics. One of the important elementary breakthroughs is the phenomenology of neutrino oscillations. This includes the properties of neutrinos in the Standard Model (SM) and how neutrino oscillations and their properties have been so important in strengthening the SM. Neutrino oscillations also play a vital role in understanding the current nature of our Universe and the way it behaves. There is also a great interest in neutrino oscillations and their connection with dark matter. In this review, we start with the introduction and discuss the theoretical background of neutrino oscillations and some experiments, which are working to detect the properties of neutrinos. Then the fundamentals of neutrino oscillations and their interactions were described. Since there are multiple sources of neutrinos, we have described the three sectors through which we can expect neutrinos to be produced. These are the atmospheric, solar, and reactor sectors. A brief section on the important milestones in neutrino oscillations is included because of the experiments and what they use to detect neutrino properties. Finally, we also include a section on sterile neutrinos since they have been under study for a long time and there is a possibility of them being connected to dark matter interactions. Doi: 10.28991/ESJ-2022-06-02-015 Full Text: PDF
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Settanta, Giulio. "JUNO Non-oscillation Physics." Journal of Physics: Conference Series 2156, no. 1 (December 1, 2021): 012109. http://dx.doi.org/10.1088/1742-6596/2156/1/012109.
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Abstract The JUNO observatory, a 20 kt liquid scintillator detector to be completed in 2021 in China, belongs to the next-generation of neutrino detectors, which share the common features of having a multi-ton scale and an energy resolution at unprecedented levels. Beside the ambitious goal of neutrino mass ordering determination, the JUNO Collaboration plans also to perform a wide series of other measurements in the neutrino and astroparticle fields, rare processes and searches for new physics. The detector characteristics will allow the detection of neutrinos from many sources, like supernovae, the Sun, atmospheric and geoneutrinos. Other potential studies accessible to JUNO include the search for exotic processes, such as nucleon decays, Dark Matter and magnetic monopoles interactions, light sterile neutrinos production. This work reviews the physics potential of JUNO about non-reactor neutrino sources, highlighting the unique contributions that the experiment will give to the various fields in the forthcoming years.
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Evans, J. J. "The MINOS Experiment: Results and Prospects." Advances in High Energy Physics 2013 (2013): 1–18. http://dx.doi.org/10.1155/2013/182537.
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The MINOS experiment has used the world’s most powerful neutrino beam to make precision neutrino oscillation measurements. By observing the disappearance of muon neutrinos, MINOS has made the world’s most precise measurement of the larger neutrino mass splitting and has measured the neutrino mixing angleθ23. Using a dedicated antineutrino beam, MINOS has made the first direct precision measurements of the corresponding antineutrino parameters. A search forνeandν-eappearance has enabled a measurement of the mixing angleθ13. A measurement of the neutral-current interaction rate has confirmed oscillation between three active neutrino flavours. MINOS will continue as MINOS+ in an upgraded beam with higher energy and intensity, allowing precision tests of the three-flavour neutrino oscillation picture, in particular a very sensitive search for the existence of sterile neutrinos.
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Bibek, Koirala, and Dhobi Saddam Husain. "Oscillation of neutrino in a vacuum with mixing flavor." International Journal of Physics Research and Applications 5, no. 1 (August 4, 2022): 018–26. http://dx.doi.org/10.29328/journal.ijpra.1001046.
Full textAbstract:
We developed multiple equations to observe the two and three flavors of neutrino oscillation with the mixing angle based on L/E=0.1 to 0.9 in this study. In different settings, the nature of the neutrino oscillation probability was discovered to be varied in different equations. The observation indicates increasing likelihood in one equation and decreasing probability in the other equations in two flavor oscillation neutrinos. To characterize the probability of neutrino oscillation, we use four distinct angles: 50, 100, 150, and 200. The probability of neutrino oscillation was determined to be highest at an angle of 150 degrees. However, with increasing mixing angles, the likelihood of oscillation increases on the basis of created equation (25) and decreases on the basis of equations (26) and (27) in the three-flavor neutrino oscillation. From generated equations (25) and (26) the maximum neutrino oscillation of probability is discovered at an angle of 150, however, from equation (27), the maximum probability is observed at 50. The greatest neutrino oscillation is found to be 0.9999 and the minimum is zero in all of these two and three flavors of oscillation.
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Decowski, Michal Patrick. "MEASUREMENT OF ANTI-NEUTRINO SPECTRAL DISTORTION BY KAMLAND." International Journal of Modern Physics A 20, no. 14 (June 10, 2005): 3051–54. http://dx.doi.org/10.1142/s0217751x05025723.
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The KamLAND experiment uses reactor anti-neutrinos to study the solar neutrino oscillation parameters. KamLAND recently updated the reactor neutrino measurement, with almost a factor 5 more statistics than previously reported. The measured spectral distortion in the anti-neutrino spectrum favors neutrino oscillation as the explanation for neutrino disappearance and gives the best value of [Formula: see text] to date.
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SUZUKI, YOICHIRO. "ATMOSPHERIC AND ACCELERATOR NEUTRINOS." International Journal of Modern Physics A 21, no. 08n09 (April 10, 2006): 1844–54. http://dx.doi.org/10.1142/s0217751x06032800.
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Recent results from the atmospheric neutrino measurements are discussed. The best constraint oscillation parameters of Δm2=2.5×10-3eV2 and sin 22θ=1.0 was obtained by a new treatment of the atmospheric neutrino data. An evidence for the ντ appearance in the atmospheric neutrino events was shown by statistical methods. The long baseline oscillation experiment using man-made neutrinos has confirmed the atmospheric neutrino oscillation and obtained consistent parameter regions. The prospects for future accelerator experiments are presented.
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Giunti, Carlo. "Phenomenology of light sterile neutrinos." Modern Physics Letters A 30, no. 20 (June 10, 2015): 1530015. http://dx.doi.org/10.1142/s0217732315300153.
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We consider the extension of standard three-neutrino mixing with the addition of one or two light sterile neutrinos which can explain the anomalies found in short-baseline neutrino oscillation experiments. We review the results of the global analyses of short-baseline neutrino oscillation data in [Formula: see text] and [Formula: see text] neutrino mixing schemes.
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Banik, Amit Dutta, and Debasish Majumdar. "Velocity-induced neutrino oscillation and its possible implications for long baseline neutrinos." Modern Physics Letters A 30, no. 01 (January 7, 2015): 1550001. http://dx.doi.org/10.1142/s0217732315500017.
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If the three types of active neutrinos possess different maximum attainable velocities and the neutrino eigenstates in the velocity basis are different from those in the flavor (and mass) basis, then this will induce a flavor oscillation in addition to the normal mass-flavor oscillation. Here we study such an oscillation scenario in three neutrino framework including also the matter effect and apply our results to demonstrate its consequences for long baseline (LBL) neutrinos. We also predict the possible signatures in terms of yields in a possible LBL neutrino experiment.
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CAMPBELL, SARAH C., SARAH R. NUSS-WARREN, LORETTA M. JOHNSON, and DOUGLAS W. MCKAY. "NEUTRINO FLAVOR AND CP/T VIOLATION." International Journal of Modern Physics A 16, supp01b (September 2001): 767–69. http://dx.doi.org/10.1142/s0217751x01008047.
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We investigate the implications of direct flavor-violating interactions in addition to neutrino oscillations for neutrino oscillations for neutrino oscillation experiments. We show that MINOS and neutrino factories could achieve at least order of magnitude improvements in constraining neutrino flavor-violating parameters.
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Naumov, Dmitry V. "The Sterile Neutrino: A short introduction." EPJ Web of Conferences 207 (2019): 04004. http://dx.doi.org/10.1051/epjconf/201920704004.
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This is a pedagogical introduction to the main concepts of the sterile neutrino - a hypothetical particle, coined to resolve some anomalies in neutrino data and retain consistency with observed widths of the W and Z bosons. We briefly review existing anomalies and the oscillation parameters that best describe these data. We discuss in more detail how sterile neutrinos can be observed, as well as the consequences of its possible existence. In particular, we pay attention to a possible loss of coherence in a model of neutrino oscillations with sterile neutrinos, where this effect might be of a major importance with respect to the 3ν model. The current status of searches for a sterile neutrino state is also briefly reviewed.
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Bellini, G., L. Ludhova, G. Ranucci, and F. L. Villante. "Neutrino Oscillations." Advances in High Energy Physics 2014 (2014): 1–28. http://dx.doi.org/10.1155/2014/191960.
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In the last decades, a very important breakthrough has been brought about in the elementary particle physics by the discovery of the phenomenon of the neutrino oscillations, which has shown neutrino properties beyond the Standard Model. But a full understanding of the various aspects of the neutrino oscillations is far to be achieved. In this paper the theoretical background of the neutrino oscillation phenomenon is described, referring in particular to the paradigmatic models. Then the various techniques and detectors which studied neutrinos from different sources are discussed, starting from the pioneering ones up to the detectors still in operation and to those in preparation. The physics results are finally presented adopting the same research path which has been crossed by this long saga. The problems not yet fixed in this field are discussed, together with the perspectives of their solutions in the near future.
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MOTIE, IMAN, and SHE-SHENG XUE. "HIGH ENERGY NEUTRINO OSCILLATION AT THE PRESENCE OF THE LORENTZ INVARIANCE VIOLATION." International Journal of Modern Physics A 27, no. 19 (July 26, 2012): 1250104. http://dx.doi.org/10.1142/s0217751x12501047.
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Due to quantum gravity fluctuations at the Planck scale, the space–time manifold is no longer continuous, but discretized. As a result the Lorentz symmetry is broken at very high energies. In this paper, we study the neutrino oscillation pattern due to the Lorentz invariance violation (LIV), and compare it with the normal neutrino oscillation pattern due to neutrino masses. We find that at very high energies, neutrino oscillation pattern is very different from the normal one. This could provide an possibility to study the Lorentz invariance violation by measuring the oscillation pattern of very high energy neutrinos from a cosmological distance.
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Domi, Alba, Simon Bourret, and Liam Quinn. "Particle Physics with ORCA." EPJ Web of Conferences 207 (2019): 04003. http://dx.doi.org/10.1051/epjconf/201920704003.
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KM3NeT is a Megaton-scale neutrino telescope currently under construction at the bottom of the Mediterranean Sea. When completed, it will consist of two separate detectors: ARCA (Astroparticle Research with Cosmics in the Abyss), optimised for high-energy neutrino astronomy, and ORCA (Oscillation Research with Cosmics in the Abyss) for neutrino oscillation studies of atmospheric neutrinos. The main goal of ORCA is the determination of the neutrino mass ordering (NMO). Nevertheless it is possible to exploit ORCA’s configuration to make other important measurements, such as sterile neutrinos, non standard interactions, tau-neutrino appearance, neutrinos from Supernovae, Dark Matter and Earth Tomography studies. Part of these analyses are summarized here.
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CUESTA, HERMAN J. MOSQUERA, and GAETANO LAMBIASE. "NEUTRINO MASS SPECTRUM FROM NEUTRINO SPIN-FLIP-DRIVEN GRAVITATIONAL WAVES." International Journal of Modern Physics D 18, no. 03 (March 2009): 435–43. http://dx.doi.org/10.1142/s0218271809014571.
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Neutrino (ν) oscillations during the core collapse and bounce of a supernova (SN) are shown to generate the most powerful detectable gravitational wave (GW) bursts. The SN neutronization phase produces mainly electron (νe) neutrinos, the oscillations of which must take place within a few mean-free paths of their resonance surface located near their neutrinosphere. Here we characterize the GW signals produced by spin-flip oscillations inside the fast-rotating protoneutron star in the SN core. In this novel mechanism, the release of both the oscillation-produced νμ's, ντ's and the spin-flip-driven GW pulse provides a unique emission offset [Formula: see text] for measuring the ν travel time to Earth. As massive ν's get noticeably delayed on its journey to Earth with respect to the GW, they generate over the oscillation transient, the accurate measurement of this time-of-flight delay by SNEWS + LIGO, VIRGO, BBO, DECIGO, etc. can assess the absolute ν mass spectrum straightforwardly.
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Gil-Botella, Inés, and Carmen Palomares. "Revealing Neutrino Oscillations Unknowns with Reactor and Long-Baseline Accelerator Experiments." Universe 8, no. 2 (January 27, 2022): 81. http://dx.doi.org/10.3390/universe8020081.
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Reactor and accelerator-based neutrino experiments have played a critical role in the understanding of neutrino oscillations and are currently dominating the high-precision measurements of neutrino oscillation parameters. The discovery of a non-zero θ13 by the reactor experiments has opened the possibility of observing CP violation in the lepton sector by long-baseline accelerator experiments. The current knowledge of the neutrino oscillation parameters will be expanded upon in the near future through more precise measurements, including the discovery of the neutrino mass ordering and the CP-violating phase. This review summarizes the distinct and complementary approach of reactor and accelerator-based neutrino experiments to measure neutrino oscillations. The main scientific achievements of the Double Chooz reactor neutrino experiment and the science program to be developed by the DUNE long-baseline neutrino experiment with the world’s most intense neutrino beam are presented in this article. Spain has strongly contributed to these results and will continue to play a prominent role in the neutrino oscillation program in the coming years.
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Yang, Guang. "The status of the Double Chooz experiment." International Journal of Modern Physics: Conference Series 31 (January 2014): 1460299. http://dx.doi.org/10.1142/s2010194514602993.
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Double Chooz is a long baseline neutrino oscillation experiment at Chooz, France. The purpose of this experiment is to measure the non-zero neutrino oscillation parameter θ13, a parameter for changing electron neutrinos into other neutrinos. This experiment uses reactors of the Chooz Nuclear Power Plant as a neutrino source. Double Chooz has published two papers with results showing the measurement of the mixing angle, and 3rd publication is processing.
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KLINKHAMER, FRANS R. "LORENTZ-NONINVARIANT NEUTRINO OSCILLATIONS: MODEL AND PREDICTIONS." International Journal of Modern Physics A 21, no. 01 (January 10, 2006): 161–83. http://dx.doi.org/10.1142/s0217751x06025298.
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We present a three-parameter neutrino-oscillation model for three flavors of massless neutrinos with Fermi-point splitting and tri-maximal mixing angles. One of these parameters is the T-violating phase ∊, for which the experimental results from K2K and KamLAND appear to favor a nonzero value. In this paper, we give further model predictions for neutrino oscillations. Upcoming experiments will be able to test this simple model and the general idea of Fermi-point splitting. Possible implications for proposed experiments and neutrino factories are also discussed.
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LIPMANOV, E. M. "ν-K0 ANALOGY, DIRAC–MAJORANA NEUTRINO DUALITY AND THE NEUTRINO OSCILLATIONS." International Journal of Modern Physics A 16, no. 30 (December 10, 2001): 4911–23. http://dx.doi.org/10.1142/s0217751x01005675.
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The intent of this paper is to convey a new primary physical idea of a Dirac–Majorana neutrino duality in relation to the topical problem of neutrino oscillations. In view of the new atmospheric, solar and the LSND neutrino oscillation data, the Pontecorvo ν - K0 oscillation analogy is generalized to the notion of neutrino duality with substantially different physical meaning ascribed to the long-baseline and the short-baseline neutrino oscillations. At the level of CP-invariance, the suggestion of dual neutrino properties defines the symmetric two-mixing-angle form of the widely discussed four-neutrino (2 +2)-mixing scheme, as a result of the lepton charge conservation selection rule and a minimum of two Dirac neutrino fields. With neutrino duality, the two-doublet structure of the Majorana neutrino mass spectrum is a vestige of the two-Dirac-neutrino origin. The fine neutrino mass doublet structure is natural because it is produced by a lepton charge symmetry violating perturbation on a zero-approximation system of two twofold mass-degenerate Dirac neutrino–antineutrino pairs. A set of inferences related to the neutrino oscillation phenomenology in vacuum is considered.
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JUNG, C. K. "RECENT RESULTS FROM K2K." International Journal of Modern Physics A 17, no. 24 (September 30, 2002): 3364–77. http://dx.doi.org/10.1142/s0217751x02012788.
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K2K is a long baseline neutrino oscillation experiment using a neutrino beam produced at the KEK 12 GeV PS, a near detector complex at KEK and a far detector (Super-Kamiokande) in Kamioka, Japan. The experiment was constructed and is being operated by an international consortium of institutions from Japan, Korea, and the US. The experiment started taking data in 1999 and has successfully taken data for about two years. K2K is the first long beseline neutrino oscillation experiment with a baseline of order hundreds of km and is the first accelerator based neutrino oscillation experiment that is sensitive to the Super-Kamiokande allowed region obtained from the atmospheric neutrino oscillation analysis. A total of 44 events have been observed in the far detector during the period of June 1999 to April 2001 corresponding to 3.85 × 1019 protons on target. The observation is consistent with the neutrino oscillation expectations based on the oscillation parameters derived from the atmospheric neutrinos, and the probability that this is a statistical fluctuation of non-oscillation expectation of [Formula: see text] is less than 3%.