Articles de revues : « Low-energy neutrino »

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OBERAUER, L. « LOW ENERGY NEUTRINO PHYSICS AFTER SNO AND KamLAND ». Modern Physics Letters A 19, n^o 05 (20 février 2004) : 337–48. http://dx.doi.org/10.1142/s0217732304013167.

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In the recent years important discoveries in the field of low energy neutrino physics (Eν in the ≈ MeV range) have been achieved. Results of the solar neutrino experiment SNO show clearly flavor transitions from νe to νμ,τ. In addition, the long standing solar neutrino problem is basically solved. With KamLAND, an experiment measuring neutrinos emitted from nuclear reactors at large distances, evidence for neutrino oscillations has been found. The values for the oscillation parameters, amplitude and phase, have been restricted. In this paper the potential of future projects in low energy neutrino physics is discussed. This encompasses future solar and reactor experiments as well as the direct search for neutrino masses. Finally the potential of a large liquid scintillator detector in an underground laboratory for supernova neutrino detection, solar neutrino detection, and the search for proton decay p→K+ν is discussed.

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Tsakstara, V., et T. S. Kosmas. « Studying the coherent channel of neutral current ν-nucleus interaction ». HNPS Proceedings 21 (8 mars 2019) : 177. http://dx.doi.org/10.12681/hnps.2029.

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Original cross-sections calculations for neutral current neutrino scattering on 40Ar isotope are performed in the context of the quasi-particle random phase approximation (QRPA) by utilizing realistic two-nucleon forces. The incoming neutrino energy range adopted, εν ≤ 100 MeV, covers the supernova neutrinos, the low-energy beta-beam-neutrinos and the pion-muon stopped neutrino-beams existing or planned to be conducted at future neutron spallation sources. Subsequently, are the original cross sections convoluted with various supernova neutrino-energy distributions such as the two-parameter Fermi-Dirac and the power law distributions. The folded cross sections are obtained for various values of the parameters of these neutrino energy distributions corresponding to different supernova scenarios. One of the main purposes of this work is to explore the response of the 40Ar isotope as supernova neutrino detector.

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Vergados, J. D., et Y. Giomataris. « Neutral current coherent cross-sections — Implications on detecting SN and earth neutrinos with gaseous spherical TPC’s ». International Journal of Modern Physics E 26, n^o 01n02 (janvier 2017) : 1740030. http://dx.doi.org/10.1142/s0218301317400304.

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The detection of galactic supernova (SN) neutrinos represents one of the future frontiers of low energy neutrino physics and astrophysics. The neutron coherence of neutral currents (NCs) allows quite large cross-sections in the case of neutron rich targets, which can be exploited in detecting earth and sky neutrinos by measuring nuclear recoils. They are relatively cheap and easy to maintain. These (NC) cross-sections are not dependent on flavor conversions and, thus, their measurement will provide useful information about the neutrino source. In particular, they will yield information about the primary neutrino fluxes and perhaps about the spectrum after flavor conversions in neutrino sphere. They might also provide some clues about the neutrino mass hierarchy. The advantages of large gaseous low threshold and high resolution time projection counters (TPC) detectors are discussed.

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de Wasseige, G. « KM3NeT sensitivity to low energy astrophysical neutrinos ». Journal of Instrumentation 16, n^o 12 (1 décembre 2021) : C12003. http://dx.doi.org/10.1088/1748-0221/16/12/c12003.

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Abstract KM3NeT, a new generation of neutrino telescope, is currently being deployed in the Mediterranean Sea. While its two sites, ORCA and ARCA, were respectively designed for the determination of neutrino mass hierarchy and high-energy neutrino astronomy, this contribution presents a study of the detection potential of KM3NeT in the MeV-GeV energy range. At these low energies, the data rate is dominated by low-energy atmospheric muons and environmental noise due to bioluminescence and K-40 decay. The goal of this study is to characterize the environmental noise in order to optimize the selection of low-energy neutrino interactions and increase the sensitivity of KM3NeT to transient astrophysical phenomena, such as close-by core-collapse supernovae, solar flares, and extragalactic transients. In this contribution, we will study how using data science tools might improve the sensitivity of KM3NeT in these low-energy neutrino searches. We will first introduce the data sets and the different variables used to characterize KM3NeT’s response to the environmental noise. We will then compare the efficiency of various tools in identifying different components in the environmental noise and in disentangling low-energy neutrino interactions from the background events. We will conclude with the implication of low-energy neutrinos for future astrophysical transient searches.

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Bondar, Aleksandr, Alexey Buzulutskov, Aleksandr Burdakov, Evgeny Grishnyaev, Aleksandr Dolgov, Aleksandr Makarov, Sergey Polosatkin, Andrey Sokolov, Sergey Taskaev et Lev Shekhtman. « Proposal for Neutron Scattering Systems for Calibration of Dark Matter Search and Low-Energy Neutrino Detectors ». Siberian Journal of Physics 8, n^o 3 (1 octobre 2013) : 27–38. http://dx.doi.org/10.54362/1818-7919-2013-8-3-27-38.

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The proposal of two neutron scattering systems for calibration of two-phase cryogenic avalanche detectors with high sensitivity being developed at Budker INP is presented. This kind of detectors is designed for the search of dark matter and low energy neutrino detection, in particular, coherent neutrino scattering on nuclei. Detector calibration is made with a measurement of ionization yield and scintillation quenching factor for low energy recoiling nuclei (in 0.5 to 100 keV range) originating from elastic scattering of neutrons. To provide wide range of recoiling nuclei energies two systems of neutron scattering are proposed. The first one is based on small-sized DD generator of fast (2.45 MeV) monoenergetic neutrons operating on sealed neutron tube. The second one is based on tandem proton accelerator and lithium target and capable of generation of monoenergetic epithermal neutrons with energy up to 100 keV

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Andringa, S., J. Asaadi, J. T. C. Bezerra, F. Capozzi, D. Caratelli, F. Cavanna, E. Church et al. « Low-energy physics in neutrino LArTPCs ». Journal of Physics G : Nuclear and Particle Physics 50, n^o 3 (1 janvier 2023) : 033001. http://dx.doi.org/10.1088/1361-6471/acad17.

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Abstract In this paper, we review scientific opportunities and challenges related to detection and reconstruction of low-energy (less than 100 MeV) signatures in liquid argon time-projection chamber (LArTPC) neutrino detectors. LArTPC neutrino detectors designed for performing precise long-baseline oscillation measurements with GeV-scale accelerator neutrino beams also have unique sensitivity to a range of physics and astrophysics signatures via detection of event features at and below the few tens of MeV range. In addition, low-energy signatures are an integral part of GeV-scale accelerator neutrino interaction final-states, and their reconstruction can enhance the oscillation physics sensitivities of LArTPC experiments. New physics signals from accelerator and natural sources also generate diverse signatures in the low-energy range, and reconstruction of these signatures can increase the breadth of Beyond the Standard Model scenarios accessible in LArTPC-based searches. A variety of experimental and theory-related challenges remain to realizing this full range of potential benefits. Neutrino interaction cross-sections and other nuclear physics processes in argon relevant to sub-hundred-MeV LArTPC signatures are poorly understood, and improved theory and experimental measurements are needed; pion decay-at-rest sources and charged particle and neutron test beams are ideal facilities for improving this understanding. There are specific calibration needs in the low-energy range, as well as specific needs for control and understanding of radiological and cosmogenic backgrounds. Low-energy signatures, whether steady-state or part of a supernova burst or larger GeV-scale event topology, have specific triggering, DAQ and reconstruction requirements that must be addressed outside the scope of conventional GeV-scale data collection and analysis pathways. Novel concepts for future LArTPC technology that enhance low-energy capabilities should also be explored to help address these challenges.

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Sato, T. « Low energy neutrino reaction ». Nuclear Physics B - Proceedings Supplements 149 (décembre 2005) : 221–23. http://dx.doi.org/10.1016/j.nuclphysbps.2005.05.095.

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D’ANGELO, DAVIDE. « Low-energy neutrino measurements ». Pramana 79, n^o 4 (octobre 2012) : 757–80. http://dx.doi.org/10.1007/s12043-012-0385-3.

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Miramonti, Lino. « Neutrino Physics and Astrophysics with the JUNO Detector ». Universe 4, n^o 11 (16 novembre 2018) : 126. http://dx.doi.org/10.3390/universe4110126.

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The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kton liquid scintillator multi-purpose underground detector, under construction near the Chinese city of Jiangmen, with data collection expected to start in 2021. The main goal of the experiment is the neutrino mass hierarchy determination, with more than three sigma significance, and the high-precision neutrino oscillation parameter measurements, detecting electron anti-neutrinos emitted from two nearby (baseline of about 53 km) nuclear power plants. Besides, the unprecedented liquid scintillator-type detector performance in target mass, energy resolution, energy calibration precision, and low-energy threshold features a rich physics program for the detection of low-energy astrophysical neutrinos, such as galactic core-collapse supernova neutrinos, solar neutrinos, and geo-neutrinos.

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Abbasi, R., M. Ackermann, J. Adams, N. Aggarwal, J. A. Aguilar, M. Ahlers, M. Ahrens et al. « IceCube Search for Neutrinos Coincident with Gravitational Wave Events from LIGO/Virgo Run O3 ». Astrophysical Journal 944, n^o 1 (1 février 2023) : 80. http://dx.doi.org/10.3847/1538-4357/aca5fc.

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Abstract Using data from the IceCube Neutrino Observatory, we searched for high-energy neutrino emission from the gravitational-wave events detected by the advanced LIGO and Virgo detectors during their third observing run. We did a low-latency follow-up on the public candidate events released during the detectors’ third observing run and an archival search on the 80 confident events reported in the GWTC-2.1 and GWTC-3 catalogs. An extended search was also conducted for neutrino emission on longer timescales from neutron star containing mergers. Follow-up searches on the candidate optical counterpart of GW190521 were also conducted. We used two methods; an unbinned maximum likelihood analysis and a Bayesian analysis using astrophysical priors, both of which were previously used to search for high-energy neutrino emission from gravitational-wave events. No significant neutrino emission was observed by any analysis, and upper limits were placed on the time-integrated neutrino flux as well as the total isotropic equivalent energy emitted in high-energy neutrinos.

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KOSKINEN, D. JASON. « ICECUBE-DEEPCORE-PINGU : FUNDAMENTAL NEUTRINO AND DARK MATTER PHYSICS AT THE SOUTH POLE ». Modern Physics Letters A 26, n^o 39 (21 décembre 2011) : 2899–915. http://dx.doi.org/10.1142/s021773231103725x.

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The IceCube neutrino observatory at the South Pole uses 1 km3 of instrumented ice to detect both astrophysical and atmospheric neutrinos. Expanding the capabilities of the original design, the DeepCore sub-array is a low-energy extension to IceCube which will collect [Formula: see text] atmospheric neutrinos a year. The high statistics sample will allow DeepCore to make neutrino oscillation measurements at higher energies and longer baselines than current experiments. The first successful observation of neutrino induced cascades in a neutrino telescope has recently been observed in DeepCore, which upon further cultivation should help refine atmospheric neutrino flux models. Besides the fundamental neutrino physics, the low-energy reach of DeepCore, down to as low as 10 GeV, and multi-megaton effective volume will enhance indirect searches for WIMP-like dark matter. A new proposal seeking to lower the energy reach down to [Formula: see text] GeV known as the Phased IceCube Next Generation Upgrade (or PINGU) will also be described.

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Ankush, Rishu Verma, Gazal Sharma et B. C. Chauhan. « Investigating Sterile Neutrino Flux in the Solar Neutrino Data ». Advances in High Energy Physics 2019 (2 juin 2019) : 1–12. http://dx.doi.org/10.1155/2019/2598953.

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There are compelling evidences for the existence of a fourth degree of freedom of neutrinos, i.e., sterile neutrino. In the recent studies the role of sterile component of neutrinos has been found to be crucial, not only in particle physics, but also in astrophysics and cosmology. This has been proposed to be one of the potential candidates of dark matter. In this work we investigate the updated solar neutrino data available from all the relevant experiments including Borexino and KamLAND solar phase in a model independent way and obtain bounds on the sterile neutrino component present in the solar neutrino flux. The mystery of the missing neutrinos is further deepening as subsequent experiments are coming up with their results. The energy spectrum of solar neutrinos, as predicted by Standard Solar Models (SSM), is seen by neutrino experiments at different parts as they are sensitive to various neutrino energy ranges. It is interesting to note that more than 98% of the calculated standard model solar neutrino flux lies below 1 MeV. Therefore, the study of low energy neutrinos can give us better understanding and the possibility of knowing about the presence of antineutrino and sterile neutrino components in solar neutrino flux. As such, this work becomes interesting as we include the data from medium energy (~1 MeV) experiments, i.e., Borexino and KamLAND solar phase. In our study we retrieve the bounds existing in literature and rather provide more stringent limits on sterile neutrino (νs) flux available in solar neutrino data.

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de Wasseige, G. « Multi-detector approach to enhance the sensitivity of neutrino telescopes to low-energy astrophysical sources ». Journal of Instrumentation 16, n^o 12 (1 décembre 2021) : C12012. http://dx.doi.org/10.1088/1748-0221/16/12/c12012.

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Abstract While large neutrino telescopes have so far mainly focused on the detection of TeV-PeV astrophysical neutrinos, several efforts are ongoing to extend the sensitivity down to the GeV level for transient sources. Only a handful of neutrino searches have been carried out at the moment leaving the signature of astrophysical transients poorly known in this energy range. In this contribution, we discuss the motivations for high-energy neutrino telescopes to explore the GeV energy range and summarize the current limitations of detectors, such as IceCube and KM3NeT. We then present and compare different approaches for multi-detector analyses that may enhance the sensitivity to a transient GeV neutrino flux.

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Abbasi, R., M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, J. M. Alameddine et al. « Search for Astrophysical Neutrinos from 1FLE Blazars with IceCube ». Astrophysical Journal 938, n^o 1 (1 octobre 2022) : 38. http://dx.doi.org/10.3847/1538-4357/ac8de4.

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Abstract The majority of astrophysical neutrinos have undetermined origins. The IceCube Neutrino Observatory has observed astrophysical neutrinos but has not yet identified their sources. Blazars are promising source candidates, but previous searches for neutrino emission from populations of blazars detected in ≳GeV gamma rays have not observed any significant neutrino excess. Recent findings in multimessenger astronomy indicate that high-energy photons, coproduced with high-energy neutrinos, are likely to be absorbed and reemitted at lower energies. Thus, lower-energy photons may be better indicators of TeV–PeV neutrino production. This paper presents the first time-integrated stacking search for astrophysical neutrino emission from MeV-detected blazars in the first Fermi Large Area Telescope low energy (1FLE) catalog using ten years of IceCube muon–neutrino data. The results of this analysis are found to be consistent with a background-only hypothesis. Assuming an E−2 neutrino spectrum and proportionality between the blazars MeV gamma-ray fluxes and TeV–PeV neutrino flux, the upper limit on the 1FLE blazar energy-scaled neutrino flux is determined to be 1.64 × 10−12 TeV cm−2 s−1 at 90% confidence level. This upper limit is approximately 1% of IceCube’s diffuse muon–neutrino flux measurement.

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Brass, Alan, Malcolm Ellis, Steve Geer, Olga Mena et Silvia Pascoli. « The Low-Energy Neutrino Factory ». Journal of Physics : Conference Series 136, n^o 4 (1 novembre 2008) : 042032. http://dx.doi.org/10.1088/1742-6596/136/4/042032.

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Oberauer, L., D. Hellgartner, T. Lewke, T. Marrodán Undagoitia, Q. Meindl, R. Möllenstedt, W. Potzel et al. « LENA : Low Energy Neutrino Astronomy ». Nuclear Physics B - Proceedings Supplements 217, n^o 1 (août 2011) : 127–29. http://dx.doi.org/10.1016/j.nuclphysbps.2011.04.083.

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Li, Tracey. « The Low-Energy Neutrino Factory ». Nuclear Physics B - Proceedings Supplements 229-232 (août 2012) : 524. http://dx.doi.org/10.1016/j.nuclphysbps.2012.09.161.

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Halim, Odysse, Claudio Casentini, Marco Drago, Viviana Fafone, Kate Scholberg, Carlo Francesco Vigorito et Giulia Pagliaroli. « Multimessenger analysis strategy for core-collapse supernova search : gravitational waves and low-energy neutrinos ». Journal of Cosmology and Astroparticle Physics 2021, n^o 11 (1 novembre 2021) : 021. http://dx.doi.org/10.1088/1475-7516/2021/11/021.

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Abstract Core-collapse supernovae are fascinating astrophysical objects for multimessenger studies. Gravitational waves are expected to play an important role in the supernova explosion mechanism. Unfortunately, their modeling is challenging, due to the stochastic nature of the dynamics and the vast range of possible progenitors. Therefore, the gravitational wave detection from these objects is still elusive with already advanced detectors. Low-energy neutrinos will be emitted copiously during the core-collapse explosion and can help the gravitational wave counterpart search. In this work, we develop a multimessenger strategy to look for such astrophysical objects. We exploit a global network of both low-energy neutrino and gravitational wave detectors. First, we discuss how to improve the detection potential of the neutrino sub-network by exploiting the time profile of a neutrino burst from a core-collapse supernova. We show that in the proposed approach, neutrino detectors can gain at least 10% of detection efficiency at the distance where their efficiency drops. Then, we combine the information provided by gravitational wave and neutrino signals in a multimessenger analysis. In particular, by using the clusters of low-energy neutrinos observed by LVD and KamLAND detectors in combination with the gravitational wave triggers from LIGO-Virgo detector network, we obtain an increase of the probability to detect the gravitational wave signal from a core-collapse supernova at 60 kpc, from zero to ∼33% for some specific gravitational wave emission model.

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Settanta, Giulio, Stefano Maria Mari, Cristina Martellini et Paolo Montini. « e- discrimination at high energy in the JUNO detector ». EPJ Web of Conferences 209 (2019) : 01011. http://dx.doi.org/10.1051/epjconf/201920901011.

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Cosmic Ray and neutrino oscillation physics can be studied by using atmospheric neutrinos. JUNO (Jiangmen Underground Neutrino Observatory) is a large liquid scintillator detector with low energy detection threshold and excellent energy resolution. The detector performances allow the atmospheric neutrino oscillation measurements. In this work, a discrimination algorithm for different reaction channels of neutrino-nucleon interactions in the JUNO liquid scintillator, in the GeV/sub-GeV energy region, is presented. The atmospheric neutrino flux is taken as reference, considering $\mathop {{v_\mu }}\limits^{( - )} $ and $\mathop {{v_e}}\limits^{( - )} $. The different temporal behaviour of the classes of events have been exploited to build a timeprofile-based discrimination algorithm. The results show a good selection power for $\mathop {{v_e}}\limits^{( - )} $ CC events, while the $\mathop {{v_\mu }}\limits^{( - )} $ CC component suffers of an important contamination from NC events at low energy, which is under study. Preliminary results are presented.

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Sobków, W. « Right-handed neutrinos in low-energy neutrino–electron scattering ». Physics Letters B 555, n^o 3-4 (mars 2003) : 215–26. http://dx.doi.org/10.1016/s0370-2693(03)00050-9.

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Abe, Seisho. « Nuclear de-excitation associated with neutrino-carbon interactions ». Journal of Physics : Conference Series 2156, n^o 1 (1 décembre 2021) : 012189. http://dx.doi.org/10.1088/1742-6596/2156/1/012189.

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Abstract Neutrino interactions in low energy regions below 30 MeV, where the experimental searches for supernova relic neutrino are conducted, have a large uncertainty due to complicated nuclear effects such as the Pauli blocking effect and de-excitation of a residual nucleus. Understanding the effect of nuclear de-excitation is especially critical since neutrons measured by liquid scintillator detectors can be emitted via de-excitation. We build a systematic method to predict nuclear de-excitation associated with neutrino-carbon interaction using TALYS and Geant4. This prediction is combined with the results of neutrino event generators, and we find a large increase in neutron multiplicity.

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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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Ranucci, G., G. Bellini, J. Benziger, D. Bick, G. Bonfini, D. Bravo, M. Buizza Avanzini et al. « Low energy neutrinos ». International Journal of Modern Physics : Conference Series 31 (janvier 2014) : 1460285. http://dx.doi.org/10.1142/s2010194514602853.

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Low energy neutrino investigation has been one of the most active fields of particle physics research over the past decades, accumulating important and sometimes unexpected achievements. In this work some of the most recent impressive successes will be reviewed, as well as the future perspectives of this exciting area of study.

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ZHELEZNYKH, IGOR. « EARLY YEARS OF HIGH-ENERGY NEUTRINO PHYSICS IN COSMIC RAYS AND NEUTRINO ASTRONOMY (1957-1962) ». International Journal of Modern Physics A 21, supp01 (juillet 2006) : 1–11. http://dx.doi.org/10.1142/s0217751x06033271.

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Ideas of deep underground and deep underwater detection of high-energy cosmic neutrinos were firstly suggested by Moisey Markov in the end of 50th. Frederic Reines was one of those who first detected high-energy atmospheric neutrinos in underground experiments in the middle of 60th (as well as low energy reactor neutrinos 10 years earlier!). Markov and Reines closely collaborated in 70th – 80th in discussion of alternative techniques for large-scale neutrino telescopes. Some events of 50 – 80 years relating to the development of a new branch of Astronomy – the High-Energy Neutrino Astronomy, in which Markov and Reines took part, were described in my talk at ARENA Workshop. Below the first part of my talk at the Workshop is presented describing discussions and meetings the neutrino physics and astrophysics relating to the period 1957-1962 when I was Markov's student and later post-graduated student.

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WEILER, THOMAS J. « PHYSICS WITH COSMIC NEUTRINOS, PEV TO ZEV ». International Journal of Modern Physics A 18, n^o 22 (10 septembre 2003) : 4065–83. http://dx.doi.org/10.1142/s0217751x03017373.

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Neutrinos offer a particularly promising eye on the extreme Universe. Neutrinos are not attenuated by intervening radiation fields such as the Cosmic Microwave Background, and so they are messengers from the very distant and very young phase of the universe. Also, neutrinos are not deflected by cosmic magnetic fields, and so they should point to their sources. In addition, there are particle physics aspects of neutrinos which can be tested only with cosmic neutrino beams. After a brief overview of highest-energy cosmic ray data, and the present and proposed experiments which will perform neutrino astronomy, we discuss two particle physics aspects of neutrinos. They are possible long-lifetime decay of the neutrino, and a measurement of the neutrino-nucleon cross-section at a CMS energy orders of magnitude beyond what can be achieved with terrestrial accelerators. Measurement of an anomalously large neutrino cross-section would indicate new physics (e.g. low string-scale, extra dimensions, precocious unification), while a smaller than expected cross-section would reveal an aspect of QCD evolution. We then discuss aspects of neutrino-primary models for the extreme-energy (EE) cosmic ray data. Primary neutrinos in extant data are motivated by the directional clustering at EE reported by the AGASA experiment. We discuss the impact of the strongly-interacting neutrino hypothesis on lower-energy physics via dispersion relations, the statistical significance of AGASA directional clustering, and the possible relevance of the Z-burst mechanism for existing EE cosmic ray data.

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Abbasi, R., M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, C. Alispach et al. « First all-flavor search for transient neutrino emission using 3-years of IceCube DeepCore data ». Journal of Cosmology and Astroparticle Physics 2022, n^o 01 (1 janvier 2022) : 027. http://dx.doi.org/10.1088/1475-7516/2022/01/027.

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Abstract Since the discovery of a flux of high-energy astrophysical neutrinos, searches for their origins have focused primarily at TeV-PeV energies. Compared to sub-TeV searches, high-energy searches benefit from an increase in the neutrino cross section, improved angular resolution on the neutrino direction, and a reduced background from atmospheric neutrinos and muons. However, the focus on high energy does not preclude the existence of sub-TeV neutrino emission where IceCube retains sensitivity. Here we present the first all-flavor search from IceCube for transient emission of low-energy neutrinos, focusing on the energy region of 5.6-100 GeV using three years of data obtained with the IceCube-DeepCore detector. We find no evidence of transient neutrino emission in the data, thus leading to a constraint on the volumetric rate of astrophysical transient sources in the range of ∼ 705-2301 Gpc-3 yr-1 for sources following a subphotospheric energy spectrum with a mean energy of 100 GeV and a bolometric energy of 1052 erg.

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Winter, J., F. von Feilitzsch, D. Hellgartner, T. Lewke, T. Marrodán Undagoitia, Q. Meindl, R. Möllenberg, L. Oberauer, M. Tippmann et M. Wurm. « Future neutrino physics with LENA (Low Energy Neutrino Astronomy) ». Journal of Physics : Conference Series 375, n^o 4 (30 juillet 2012) : 042052. http://dx.doi.org/10.1088/1742-6596/375/1/042052.

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Nucciotti, A. « The Use of Low Temperature Detectors for Direct Measurements of the Mass of the Electron Neutrino ». Advances in High Energy Physics 2016 (2016) : 1–41. http://dx.doi.org/10.1155/2016/9153024.

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Recent years have witnessed many exciting breakthroughs in neutrino physics. The detection of neutrino oscillations has proved that neutrinos are massive particles, but the assessment of their absolute mass scale is still an outstanding challenge in today particle physics and cosmology. Since low temperature detectors were first proposed for neutrino physics experiments in 1984, there has been tremendous technical progress: today this technique offers the high energy resolution and scalability required to perform competitive experiments challenging the lowest electron neutrino masses. This paper reviews the thirty-year effort aimed at realizing calorimetric measurements with sub-eV neutrino mass sensitivity using low temperature detectors.

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Giacomelli, G., et A. Margiotta. « The MACRO Experiment ». Modern Physics Letters A 18, n^o 29 (21 septembre 2003) : 2001–18. http://dx.doi.org/10.1142/s0217732303011654.

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In this paper we describe the main results obtained by the MACRO experiment: final stringent upper limits on GUT magnetic monopoles and nuclearites, results on atmospheric neutrino oscillations, high energy muon neutrino astronomy, searches for WIMPs, search for low energy stellar gravitational collapse neutrinos, several studies with high energy downgoing muons and determination of the primary cosmic ray composition at knee energies.

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GUENDELMAN, E. I., et A. B. KAGANOVICH. « EXOTIC LOW DENSITY FERMION STATES IN THE TWO MEASURES FIELD THEORY : NEUTRINO DARK ENERGY ». International Journal of Modern Physics A 21, n^o 21 (20 août 2006) : 4373–406. http://dx.doi.org/10.1142/s0217751x06032538.

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There exist field theory models where the fermionic energy–momentum tensor contains a term proportional to [Formula: see text] which may contribute to the dark energy. We show that this new field theory effect can be achieved in the Two Measures Field Theory (TMT) in the cosmological context. TMT is an alternative gravity and matter field theory where the gravitational interaction of fermionic matter is reduced to that of General Relativity when the energy density of the fermion matter is much larger than the dark energy density. In this case also the fifth force problem is solved automatically. In the opposite limit, where the magnitudes of fermionic energy density and scalar field dark energy density become comparable, nonrelativistic fermions can participate in the cosmological expansion in a very unusual manner. Some of the features of such Cosmo-Low-Energy-Physics (CLEP) states are studied in a toy model of the late time universe filled with homogeneous scalar field and uniformly distributed nonrelativistic neutrinos, and the following results are obtained: neutrino mass increases as m ∝ a3/2 (a is the scale factor); the proportionality factor in the noncanonical contribution to the neutrino energy–momentum tensor (proportional to the metric tensor) approaches a constant as a(t) → ∞ and therefore the noncanonical contribution to the neutrino energy density dominates over the canonical one ~ m/a3 ~ a-3/2 at the late enough universe; hence the neutrino gas equation-of-state approaches w = -1, i.e. neutrinos in the CLEP regime behave as a sort of dark energy as a → ∞; the equation-of-state for the total (scalar field + neutrino) energy density and pressure also approaches w = -1 in the CLEP regime; besides the total energy density of such universe is less than it would be in the universe filled with the scalar field alone. An analytic solution is presented. A domain structure of the dark energy seems to be possible. We speculate that decays of the CLEP state neutrinos may be both an origin of cosmic rays and responsible for a late super-acceleration of the universe. In this sense the CLEP states exhibit simultaneously new physics at very low densities and for very high particle masses.

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Tsakstara, V., T. S. Kosmas et J. Sinatkas. « Nuclear response to supernova neutrino spectra ». HNPS Proceedings 18 (23 novembre 2019) : 187. http://dx.doi.org/10.12681/hnps.2551.

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In current probes searching for rare event processes, appropriate nuclear targets are employed (in the COBRA double-beta decay detector the CdZnTe semiconductor is used). In this work the response of such detectors to various low-energy neutrino spectra is explored starting from state-by-state calculations of the neutrino-nucleus reactions cross sections obtained by using the quasi particle random phase approximation (QRPA) based on realistic two-body residual interactions. As a concrete example, we examine the response of 64Zn isotope to low energy supernova neutrinos.

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RAY, SHAMAYITA. « RENORMALIZATION GROUP EVOLUTION OF NEUTRINO MASSES AND MIXING IN SEESAW MODELS ». International Journal of Modern Physics A 25, n^o 23 (20 septembre 2010) : 4339–84. http://dx.doi.org/10.1142/s0217751x10049839.

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We consider different extensions of the Standard Model which can give rise to the small active neutrino masses through seesaw mechanisms, and their mixing. These tiny neutrino masses are generated at some high energy scale by the heavy seesaw fields which then get sequentially decoupled to give an effective dimension-5 operator at the low energy. The renormalization group evolution of the masses and the mixing parameters of the three active neutrinos in the high energy as well as the low energy effective theory is reviewed in this paper.

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33

Grieb, Christian. « Low Energy Neutrinos, Neutrino Luminosity of the Sun & ; LENS ». Nuclear Physics B - Proceedings Supplements 168 (juin 2007) : 122–24. http://dx.doi.org/10.1016/j.nuclphysbps.2007.02.017.

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Abada, Asmaa, Carla Biggio, Florian Bonnet, Maria B. Gavela et Thomas Hambye. « Low energy effects of neutrino masses ». Journal of High Energy Physics 2007, n^o 12 (17 décembre 2007) : 061. http://dx.doi.org/10.1088/1126-6708/2007/12/061.

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Wurm, M., D. Bick, T. Enqvist, D. Hellgartner, M. Kaiser, K. K. Loo, S. Lorenz et al. « Low-energy Neutrino Astronomy in LENA ». Physics Procedia 61 (2015) : 376–83. http://dx.doi.org/10.1016/j.phpro.2014.12.078.

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Mitsui, Tadao. « Low-energy neutrino physics with KamLAND ». Nuclear Physics B - Proceedings Supplements 217, n^o 1 (août 2011) : 89–94. http://dx.doi.org/10.1016/j.nuclphysbps.2011.04.075.

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Sarrat, A. « HELLAZ : a low energy neutrino spectrometer ». Nuclear Physics B - Proceedings Supplements 95, n^o 1-3 (avril 2001) : 177–80. http://dx.doi.org/10.1016/s0920-5632(01)01079-9.

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Liu, Jiang. « Low-energy neutrino-two-photon interactions ». Physical Review D 44, n^o 9 (1 novembre 1991) : 2879–91. http://dx.doi.org/10.1103/physrevd.44.2879.

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Volkova, L. V. « Low energy atmospheric neutrino data interpretations ». Physics Letters B 316, n^o 1 (octobre 1993) : 178–80. http://dx.doi.org/10.1016/0370-2693(93)90676-9.

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Aksenov, Alexey G. « A Multidimensional Multicomponent Gas Dynamic with the Neutrino Transfer in Gravitational Collapse ». Universe 8, n^o 7 (7 juillet 2022) : 372. http://dx.doi.org/10.3390/universe8070372.

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The self-consistent problem of gravitational collapse is solved using 2D gas dynamics with taking into account the neutrino transfer in the flux-limited diffusion approximation. Neutrino are described by spectral energy density, and weak interaction includes a simplified physical model of neutrino interactions with nucleons. I investigate convection on the stage of the collapse and then in the center of the core, where the unstable entropy profile was probably formed. It is shown that convection has large scale. Convection appears only in the semitransparent region near the neutrinosphere due to non-equilibrium nonreversible neutronization. Convection increases the energy of emitted neutrino up to 15÷18 MeV. The obtained neutrino spectrum is important for the registration of low-energy neutrinos from a supernova.

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41

Minakata, H., et C. Peña-Garay. « Solar Neutrino Observables Sensitive to Matter Effects ». Advances in High Energy Physics 2012 (2012) : 1–15. http://dx.doi.org/10.1155/2012/349686.

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We discuss constraints on the coefficientAMSWwhich is introduced to simulate the effect of weaker or stronger matter potential for electron neutrinos with the current and future solar neutrino data. The currently available solar neutrino data leads to a boundAMSW=1.47+0.54−0.42(+1.88−0.82)at 1σ(3σ) CL, which is consistent with the Standard Model predictionAMSW=1. For weaker matter potential (AMSW<1), the constraint which comes from the flat8B neutrino spectrum is already very tight, indicating the evidence for matter effects. However for stronger matter potential (AMSW>1), the bound is milder and is dominated by the day-night asymmetry of8B neutrino flux recently observed by Super-Kamiokande. Among the list of observables of ongoing and future solar neutrino experiments, we find that (1) an improved precision of the day-night asymmetry of8B neutrinos, (2) precision measurements of the low-energy quasi-monoenergetic neutrinos, and (3) the detection of the upturn of the8B neutrino spectrum at low energies are the best choices to improve the bound onAMSW.

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42

DI GREZIA, E., S. ESPOSITO et G. SALESI. « LABORATORY BOUNDS ON LORENTZ SYMMETRY VIOLATION IN LOW ENERGY NEUTRINO PHYSICS ». Modern Physics Letters A 21, n^o 04 (10 février 2006) : 349–61. http://dx.doi.org/10.1142/s0217732306019487.

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Quantitative bounds on Lorentz symmetry violation in the neutrino sector have been obtained by analyzing existing laboratory data on neutron β decay and pion leptonic decays. In particular some parameters appearing in the energy–momentum dispersion relations for νe and νμ have been constrained in two typical cases arising in many models accounting for Lorentz violation.

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Divari, Paraskevi C., et John D. Vergados. « Heavy Sterile Neutrino in Dark Matter Searches ». Advances in High Energy Physics 2018 (2018) : 1–14. http://dx.doi.org/10.1155/2018/1479313.

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Sterile neutrinos are possible dark matter candidates. We examine here possible detection mechanisms, assuming that the neutrino has a mass of about 50 keV and couples to the ordinary neutrino. Even though this neutrino is quite heavy, it is nonrelativistic with a maximum kinetic energy of 0.1 eV. Thus new experimental techniques are required for its detection. We estimate the expected event rate in the following cases: (i) measuring electron recoil in the case of materials with very low electron binding; (ii) low temperature crystal bolometers; (iii) spin induced atomic excitations at very low temperatures, leading to a characteristic photon spectrum; (iv) observation of resonances in antineutrino absorption by a nucleus undergoing electron capture; (v) neutrino induced electron events beyond the end point energy of beta decaying systems, for example, in the tritium decay studied by KATRIN.

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Leonard DeHolton, K. « Low energy event classification in IceCube using boosted decision trees ». Journal of Instrumentation 16, n^o 12 (1 décembre 2021) : C12007. http://dx.doi.org/10.1088/1748-0221/16/12/c12007.

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Abstract The DeepCore sub-array within the IceCube Neutrino Observatory is a densely instrumented region of Antarctic ice designed to observe atmospheric neutrino interactions above 5 GeV via Cherenkov radiation. An essential aspect of any neutrino oscillation analysis is the ability to accurately identify the flavor of neutrino events in the detector. This task is particularly difficult at low energies when very little light is deposited in the detector. Here we discuss the use of machine learning to perform event classification at low energies in IceCube using a boosted decision tree (BDT). A BDT is trained using reconstructed quantities to identify track-like events, which result from muon neutrino charged current interactions. This new method improves the accuracy of particle identification compared to traditional classification methods which rely on univariate straight cuts.

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Tsakstara, Vaitsa. « Convolutedν-Signals on114Cd Isotope from Astrophysical and Laboratory Neutrino Sources ». Advances in High Energy Physics 2015 (2015) : 1–11. http://dx.doi.org/10.1155/2015/632131.

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At first, we evaluate scattering cross sections of low, and intermediate-energy neutrinos scattered off the114Cd isotope, the most abundant Cd isotope present also in the COBRA detector (CdTe and CdZnTe materials) which aims to search for double beta decay events and neutrino observations at Gran Sasso laboratory (LNGS). The coherentν-nucleus channel addressed here is the dominant reaction channel of the neutral currentν-nucleus scattering. Ourν-nucleus cross sections (calculated with a refinement of the quasiparticle random-phase approximation, QRPA) refer to thegs→gstransitions forν-energiesεν≤100 MeV. Subsequently, simulatedν-signals on114Cd isotope are derived. Towards this purpose, the required folded cross section comes out of simulation techniques by employing several low, and intermediate-energy neutrino distributions of the astrophysicalν-sources, like the solar, supernova, and Earth neutrinos, as well as the laboratory neutrinos, the reactor neutrinos, the pion-muon stopped neutrinos, and theβ-beam neutrinos.

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Donchenko, Georgy, Konstantin Kouzakov et Alexander Studenikin. « Neutrino magnetic moments in low-energy neutrino scattering on condensed matter systems ». Journal of Physics : Conference Series 2156, n^o 1 (1 décembre 2021) : 012231. http://dx.doi.org/10.1088/1742-6596/2156/1/012231.

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Abstract The cross sections of elastic neutrino scattering on electrons and nuclei in the regime of low-energy transfer are known to be very sensitive to neutrino electromagnetic properties. In particular, the magnetic moment of the neutrino can be effectively searched using liquid or solid detectors with a very low energy threshold. We present the formalism that incorporates the neutrino magnetic moment contribution in the theoretical treatment of the low-energy elastic neutrino scattering on a condensed-matter target. The concept of the dynamic structure factor is employed to describe the collective effects in the target. The differential cross section for tritium antineutrino scattering on the superfluid 4He is calculated numerically. We find that the neutrino magnetic moment of the order of 10−11 μB strongly affects the cross section. Our results can be used in the search of neutrino magnetic moments in future low-energy neutrino scattering experiments with liquid or solid targets.

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47

Blennow, Mattias, et Alexei Yu Smirnov. « Neutrino Propagation in Matter ». Advances in High Energy Physics 2013 (2013) : 1–33. http://dx.doi.org/10.1155/2013/972485.

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We describe the effects of neutrino propagation in the matter of the Earth relevant to experiments with atmospheric and accelerator neutrinos and aimed at the determination of the neutrino mass hierarchy and CP violation. These include (i) the resonance enhancement of neutrino oscillations in matter with constant or nearly constant density, (ii) adiabatic conversion in matter with slowly changing density, (iii) parametric enhancement of oscillations in a multilayer medium, and (iv) oscillations in thin layers of matter. We present the results of semianalytic descriptions of flavor transitions for the cases of small density perturbations, in the limit of large densities and for small density widths. Neutrino oscillograms of the Earth and their structure after determination of the 1–3 mixing are described. A possibility to identify the neutrino mass hierarchy with the atmospheric neutrinos and multimegaton scale detectors having low energy thresholds is explored. The potential of future accelerator experiments to establish the hierarchy is outlined.

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Miramonti, Lino, Matteo Agostini, Konrad Altenmueller, Simon Appel, Victor Atroshchenko, Zara Bagdasarian, Davide Basilico et al. « Solar Neutrinos Spectroscopy with Borexino Phase-II ». Universe 4, n^o 11 (7 novembre 2018) : 118. http://dx.doi.org/10.3390/universe4110118.

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Solar neutrinos have played a central role in the discovery of the neutrino oscillation mechanism. They still are proving to be a unique tool to help investigate the fusion reactions that power stars and further probe basic neutrino properties. The Borexino neutrino observatory has been operationally acquiring data at Laboratori Nazionali del Gran Sasso in Italy since 2007. Its main goal is the real-time study of low energy neutrinos (solar or originated elsewhere, such as geo-neutrinos). The latest analysis of experimental data, taken during the so-called Borexino Phase-II (2011-present), will be showcased in this talk—yielding new high-precision, simultaneous wide band flux measurements of the four main solar neutrino components belonging to the “pp” fusion chain (pp, pep, 7 Be, 8 B), as well as upper limits on the remaining two solar neutrino fluxes (CNO and hep).

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Pestel, V., Z. Aly et L. Nauta. « Analysis of the first KM3NeT-ORCA data ». Journal of Instrumentation 16, n^o 11 (1 novembre 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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Athar, M. Sajjad, Shakeb Ahmad et S. K. Singh. « Neutrino nucleus cross sections for low energy neutrinos at SNS facilities ». Nuclear Physics A 764 (janvier 2006) : 551–68. http://dx.doi.org/10.1016/j.nuclphysa.2005.09.017.

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