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Artigos de revistas sobre o tema "Neutrinoless double-Beta decays"

Autor: Grafiati

Publicado: 23 de novembro de 2024

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1

Xing, Z. Z., e Z. H. Zhao. "Neutrinoless double-beta decays: New insights". Modern Physics Letters A 32, n.º 14 (2 de maio de 2017): 1730011. http://dx.doi.org/10.1142/s0217732317300117.

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We give some new insights into the effective Majorana neutrino mass [Formula: see text] responsible for the neutrinoless double-beta [Formula: see text] decays. We put forward a three-dimensional way of plotting [Formula: see text] against the lightest neutrino mass and the Majorana phases, which can provide more information as compared with the two-dimensional one. With the help of such graphs we discover a novel threshold of [Formula: see text] in terms of the neutrino masses and flavor mixing angles: [Formula: see text] in connection with [Formula: see text] and [Formula: see text], which can be used to signify observability of the future [Formula: see text]-decay experiments. Fortunately, the possibility of [Formula: see text] turns out to be very small, promising a hopeful prospect for the [Formula: see text]-decay searches.

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2

Maalampi, Jukka, e Jouni Suhonen. "Neutrinoless Doubleβ+/EC Decays". Advances in High Energy Physics 2013 (2013): 1–18. http://dx.doi.org/10.1155/2013/505874.

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The relation of neutrino masses to neutrino oscillations and the nuclear double beta decay is highlighted. In particular, the neutrinolessβ+β+,β+EC, and resonant ECEC decays are investigated using microscopic nuclear models. Transitions to the ground state and excited 0+states are analyzed. Systematics of the related nuclear matrix elements are studied and the present status of the resonant ECEC decays is reviewed.

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3

Suhonen, Jouni. "Neutrinoless double beta decays of 106Cd revisited". Physics Letters B 701, n.º 4 (julho de 2011): 490–95. http://dx.doi.org/10.1016/j.physletb.2011.06.016.

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4

Shirai, Junpei. "Double Beta Decay". International Journal of Modern Physics: Conference Series 46 (janeiro de 2018): 1860002. http://dx.doi.org/10.1142/s2010194518600029.

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Double beta decay is a key process to reveal a fundamental property of neutrinos. If neutrinos are Majorana particles, that is they are equivalent to their antiparticles, neutrinoless double beta ([Formula: see text]) decay, [Formula: see text], would occur. The process is beyond the standard model and would lead to a scenario which can explain the extremely small masses of neutrinos and provide a solution to the current matter dominance of the world. In this talk experimental efforts searching for [Formula: see text] decays are presented. Then, major [Formula: see text] experiments together with searches using [Formula: see text]Xe nuclei are described, followed by the current status of the KamLAND-Zen experiment.

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5

Caurier, E., F. Nowacki, A. Poves e J. Retamosa. "Shell model study of the neutrinoless double beta decays". Nuclear Physics A 654, n.º 1 (julho de 1999): 973c—976c. http://dx.doi.org/10.1016/s0375-9474(00)88583-8.

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6

Xing, Zhi-Zhong, e Ye-Ling Zhou. "On the Majorana neutrinos and neutrinoless double beta decays". Modern Physics Letters A 30, n.º 25 (30 de julho de 2015): 1530019. http://dx.doi.org/10.1142/s0217732315300190.

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The neutrinoless double-beta [Formula: see text] decay is a lepton-number-violating process which is experimentally unique for identifying the Majorana nature of massive neutrinos. We give a brief overview of some theoretical aspects of this process. In particular, a novel “coupling-rod” diagram is introduced to describe the effective Majorana mass [Formula: see text] in the complex plane. Possible contributions of new physics to [Formula: see text] are also discussed.

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7

FALCONE, D. "LEPTON NUMBER AND LEPTON FLAVOR VIOLATIONS IN SEESAW MODELS". Modern Physics Letters A 17, n.º 37 (7 de dezembro de 2002): 2467–75. http://dx.doi.org/10.1142/s0217732302009180.

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We discuss the impact of fermion mass matrices on some lepton number violating processes, namely baryogenesis via leptogenesis and neutrinoless double beta decay, and on some lepton flavor violating processes, namely radiative lepton decays in supersymmetric seesaw models.

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8

Pascoli, S., e S. T. Petcov. "Majorana neutrinos, CP violation, neutrinoless double beta and tritium beta decays". Physics of Atomic Nuclei 66, n.º 3 (março de 2003): 444–51. http://dx.doi.org/10.1134/1.1563702.

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9

Salamida, Francesco. "Search for neutrinoless double-beta decays in Ge-76 in the LEGEND experiment". Journal of Physics: Conference Series 1643, n.º 1 (1 de dezembro de 2020): 012026. http://dx.doi.org/10.1088/1742-6596/1643/1/012026.

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Abstract The search for neutrinoless double-beta decay is the most sensitive technique to establish the Majorana nature of neutrinos. Two operating experiments that look for such decays in Ge-76, GERDA and MAJORANA DEMONSTRATOR have achieved the lowest backgrounds and the best energy resolution in the signal region. These are two of the most important detector characteristics for sensitive searches of this undiscovered decay. The Large Enriched Germanium Experiment for Neutrinoless Double-Beta Decay (LEGEND) Collaboration has been formed to pursue a tonne-scale Ge-76 experiment that integrates the best technologies from these two experiments and others in the field. The Collaboration is developing a phased experimental program that uses existing resources as appropriate to expedite physics results, with the ultimate discovery potential at a decay half-life beyond 1028 years.

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10

Alduino, C., K. Alfonso, F. T. Avignone, O. Azzolini, G. Bari, F. Bellini, G. Benato et al. "Study of rare nuclear processes with CUORE". International Journal of Modern Physics A 33, n.º 09 (30 de março de 2018): 1843002. http://dx.doi.org/10.1142/s0217751x18430029.

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TeO2 bolometers have been used for many years to search for neutrinoless double beta decay in [Formula: see text]Te. CUORE, a tonne-scale TeO2 detector array, recently published the most sensitive limit on the half-life, [Formula: see text] yr, which corresponds to an upper bound of 140–400 meV on the effective Majorana mass of the neutrino. While it makes CUORE a world-leading experiment looking for neutrinoless double beta decay, it is not the only study that CUORE will contribute to in the field of nuclear and particle physics. As already done over the years with many small-scale experiments, CUORE will investigate both rare decays (such as the two-neutrino double beta decay of [Formula: see text]Te and the hypothesized electron capture in [Formula: see text]Te), and rare processes (e.g. dark matter and axion interactions). This paper describes some of the achievements of past experiments that used TeO2 bolometers, and perspectives for CUORE.

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11

Dracos, Marcos. "Possibility of detecting neutrinoless double beta decays using nuclear emulsions". Radiation Measurements 44, n.º 9-10 (outubro de 2009): 729–32. http://dx.doi.org/10.1016/j.radmeas.2009.10.061.

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12

Mustonen, M. T., e J. Suhonen. "Neutrino mass, neutrinoless double electron capture and rare beta decays". Journal of Physics: Conference Series 203 (1 de janeiro de 2010): 012066. http://dx.doi.org/10.1088/1742-6596/203/1/012066.

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13

van Kolck, U. "Lepton- and baryon-number violation in nuclear effective field theory". Journal of Physics: Conference Series 2453, n.º 1 (1 de março de 2023): 012014. http://dx.doi.org/10.1088/1742-6596/2453/1/012014.

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Abstract Lepton and baryon numbers are accidental symmetries in the effective field theory (EFT) of the Standard Model. Their violation would lead to spectacular nuclear decays which can be described with nuclear EFTs. I discuss ways in which two such decays — the neutrinoless double-beta decay of heavy nuclei and the disappearance of the deuteron — provide complementary information to processes that take place outside the nuclear environment — neutrino masses, nucleon decay, and neutron-antineutron oscillations.

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14

Zhang, Jue. "Neutrino mass ordering in future neutrinoless double beta decay experiments". Modern Physics Letters A 31, n.º 22 (14 de julho de 2016): 1630020. http://dx.doi.org/10.1142/s0217732316300202.

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Motivated by recent intensive experimental efforts on searching for neutrinoless double beta decays, we present a detailed quantitative analysis on the prospect of resolving neutrino mass ordering in the next generation [Formula: see text]Ge-type experiments.

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15

Sevestrean, Vasile-Alin, e Sabin Stoica. "Theoretical Advances in Beta and Double-Beta Decay". Symmetry 16, n.º 4 (26 de março de 2024): 390. http://dx.doi.org/10.3390/sym16040390.

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Weak interaction processes continue to be hot topics in fundamental physics research. In this paper, we briefly review some recent advances in the theoretical study of beta and double-beta decays that include both the nuclear and atomic part of these processes. On the nuclear side, we present a statistical approach for the computation of the nuclear matrix elements (NME) for neutrinoless double-beta (0νββ). A range of NME values, the most probable value for NME, and the associated theoretical uncertainty are given. Correlations with other related observables are shown as well. On the atomic side, we first briefly review the methods used to obtain the electrons’ wave functions. Further, we use them for the computation of some relevant kinematic quantities such as Fermi functions, electron spectra, and angular correlation between the emitted electrons. Then, we present applications of these calculations to the experimental data analysis related to the search of the Lorentz invariance violation in two-neutrino double-beta (2νββ) decay and description of the decay rates and decay rate ratios for allowed and unique forbidden electron capture (EC) processes.

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16

RODEJOHANN, WERNER, e KATHRIN A. HOCHMUTH. "LEPTON FLAVOR VIOLATION, LEPTOGENESIS AND NEUTRINO MIXING IN QUARK-LEPTON COMPLEMENTARITY SCENARIOS". International Journal of Modern Physics A 22, n.º 31 (20 de dezembro de 2007): 5875–88. http://dx.doi.org/10.1142/s0217751x07039092.

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We conduct a detailed analysis of the phenomenology of two predictive see-saw scenarios which lead to the Quark-Lepton Complementarity relation θ12+θC = π/4. The neutrino mixing observables and their correlations, neutrinoless double beta decay, lepton flavor violating decays such as μ → eγ and leptogenesis are discussed. The features which allow to distinguish the scenarios are identified.

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17

WANG, YIFANG. "RECENT RESULTS OF NON-ACCELERATOR-BASED NEUTRINO EXPERIMENTS". International Journal of Modern Physics A 20, n.º 22 (10 de setembro de 2005): 5244–53. http://dx.doi.org/10.1142/s0217751x05028752.

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Recent results of non-accelerator-based experiments, including those of solar, atmospheric, and reactor neutrinos oscillations, neutrinoless double-beta decays, and neutrino magnetic moments, are reviewed. Future projects and their respective prospects are summarized.

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18

Chun, E. J., G. Cvetič, P. S. B. Dev, M. Drewes, C. S. Fong, B. Garbrecht, T. Hambye et al. "Probing leptogenesis". International Journal of Modern Physics A 33, n.º 05n06 (28 de fevereiro de 2018): 1842005. http://dx.doi.org/10.1142/s0217751x18420058.

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The focus of this paper lies on the possible experimental tests of leptogenesis scenarios. We consider both leptogenesis generated from oscillations, as well as leptogenesis from out-of-equilibrium decays. As the Akhmedov–Rubakov–Smirnov (ARS) mechanism allows for heavy neutrinos in the GeV range, this opens up a plethora of possible experimental tests, e.g. at neutrino oscillation experiments, neutrinoless double beta decay, and direct searches for neutral heavy leptons at future facilities. In contrast, testing leptogenesis from out-of-equilibrium decays is a quite difficult task. We comment on the necessary conditions for having successful leptogenesis at the TeV-scale. We further discuss possible realizations and their model specific testability in extended seesaw models, models with extended gauge sectors, and supersymmetric leptogenesis. Not being able to test high-scale leptogenesis directly, we present a way to falsify such scenarios by focusing on their washout processes. This is discussed specifically for the left–right symmetric model and the observation of a heavy [Formula: see text], as well as model independently when measuring [Formula: see text] washout processes at the LHC or neutrinoless double beta decay.

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19

Liu, Jun-Hao, Jue Zhang e Shun Zhou. "Majorana neutrino masses from neutrinoless double-beta decays and lepton-number-violating meson decays". Physics Letters B 760 (setembro de 2016): 571–76. http://dx.doi.org/10.1016/j.physletb.2016.07.043.

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20

KEUM, YONG-YEON. "Neutrino mass bounds from neutrinoless double beta-decays and cosmological probes". Pramana 86, n.º 2 (21 de janeiro de 2016): 437–51. http://dx.doi.org/10.1007/s12043-015-1164-8.

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21

Wu, H. F., C. L. Song e H. Q. Song. "Neutrinoless double beta decays and nuclear matrix elements of 76Ge and 82Se". Physics Reports 242, n.º 4-6 (julho de 1994): 495–503. http://dx.doi.org/10.1016/0370-1573(94)90183-x.

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22

Kotila, Jenni. "Rare weak decays and neutrino mass". Journal of Physics: Conference Series 2453, n.º 1 (1 de março de 2023): 012012. http://dx.doi.org/10.1088/1742-6596/2453/1/012012.

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Abstract The question whether neutrinos are Majorana fermions (i.e., their own anti-particles) remains among the most fundamental open questions of subatomic physics. If neutrinos are Majorana particles it would revolutionize our understanding of physics. Although neutrinoless double beta decay, 0νββ, was proposed more than 80 years ago to establish the nature of neutrinos, it remains the most sensitive probe into the non-conservation of lepton number. 0νββ-decay is a postulated extremely slow and yet unobserved radioactive process in which two neutrons (or protons) inside a nucleus transform into two protons (or neutrons) emitting two electrons (or positrons), respectively, but no neutrinos. Its observation would be a breakthrough in the description of elementary particles and would provide fundamental information on the neutrino masses, their nature, and origin. In this paper double beta decay, its connection to neutrino mass, and mechanisms beyond the standard mass mechanism are discussed from a theoretical point of view. The current situation is then addressed by combining theoretical results with recent experimental limits.

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23

SUHONEN, JOUNI. "NUCLEAR-STRUCTURE EFFECTS ON DOUBLE BETA DECAYS TO 0+ STATES IN 76Ge". International Journal of Modern Physics E 20, n.º 02 (fevereiro de 2011): 451–58. http://dx.doi.org/10.1142/s0218301311017843.

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Neutrinoless double beta (0νββ) decay of 76 Ge to the ground state and first excited 0+ state in 76 Se is discussed in terms of the associated nuclear matrix elements. The effects arizing from the size of the single-particle model space and the occupancies of the individual orbits are discussed in the framework of the (higher) quasiparticle random-phase approximation with effective, G -matrix-derived nuclear forces. It is found that the orbital occupancies play a role for the size of the nuclear matrix element. Contrary to the ground-state transition the transition to the first excited 0+ state does not depend sensitively on the size of the model space.

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24

HEUSCH, CLEMENS A., e PETER MINKOWSKI. "HEAVY MAJORANA NEUTRINOS IN HIGH-ENERGY e-e- COLLISIONS COMPARED WITH THEIR EFFECTS INDUCING NEUTRINOLESS DOUBLE BETA DECAY". International Journal of Modern Physics A 15, n.º 16 (30 de junho de 2000): 2429–46. http://dx.doi.org/10.1142/s0217751x00002500.

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We discuss the potential of e-e- collisions at energies comparable to the masses of heavy Majorana neutrinos to reveal their mass and mixing parameters. This potential is compared with the low-energy environment in neutrinoless double beta decay of complex nuclei. We give estimates for the short-range repulsion between any pair of valence quarks bound inside two different nucleons giving rise to suppression factors in the range of 50–100 in amplitude for decays mediated by heavy flavors.

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25

Hyvärinen, Juhani, e Jouni Suhonen. "Analysis of the Intermediate-State Contributions to Neutrinoless Doubleβ−Decays". Advances in High Energy Physics 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/4714829.

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A comprehensive analysis of the structure of the nuclear matrix elements (NMEs) of neutrinoless double beta-minus (0νβ-β-) decays to the0+ground and first excited states is performed in terms of the contributing multipole states in the intermediate nuclei of0νβ-β-transitions. We concentrate on the transitions mediated by the light (l-NMEs) Majorana neutrinos. As nuclear model we use the proton-neutron quasiparticle random-phase approximation (pnQRPA) with a realistic two-nucleon interaction based on the Bonn one-boson-exchangeGmatrix. In the computations we include the appropriate short-range correlations, nucleon form factors, and higher-order nucleonic weak currents and restore the isospin symmetry by the isoscalar-isovector decomposition of the particle-particle proton-neutron interaction parametergpp.

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26

Campani, A. "The search for neutrinoless positron emitting electron capture (0υECβ ⁺) of ¹²⁰Te with CUORE". Journal of Physics: Conference Series 2156, n.º 1 (1 de dezembro de 2021): 012208. http://dx.doi.org/10.1088/1742-6596/2156/1/012208.

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Abstract CUORE (Cryogenic Underground Observatory for Rare Events) is a tonne-scale experiment located at the LNGS with the main scientific goal of searching for neutrinoless double beta decay in 130Te. The detector consists of TeO2 crystals operated as cryogenic calorimeters. The use of natural tellurium allows us to search for other isotopes rare decays. The neutrinoless positron emitting electron capture (0υECβ +) of 120Te (natural abundance 0.09(1)%) has a clear signature from the 511-keV annihilation γ rays. We present an analysis of this process based on a new algorithm to perform the simultaneous spectral fit over five selected decay scenarios. Each scenario is characterized by a set of crystals simultaneously interested by a detectable energy release. We describe the background structure modeling and tests of linearity we performed on the fit algorithm. We finally present the limit setting sensitivity and the next steps of this study, including systematics accounting.

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27

HE, XIAO-GANG, e A. ZEE. "GEOMETRIC MEAN NEUTRINO MASS RELATION". Modern Physics Letters A 22, n.º 25n28 (14 de setembro de 2007): 2107–12. http://dx.doi.org/10.1142/s0217732307025352.

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Present experimental data from neutrino oscillations have provided much information about the neutrino mixing angles. Since neutrino oscillations only determine the mass squared differences [Formula: see text], the absolute values for neutrino masses mi, can not be determined using data just from oscillations. In this work we study implications on neutrino masses from a geometric mean mass relation [Formula: see text] which enables one to determined the absolute masses of the neutrinos. We find that the central values of the three neutrino masses and their 2σ errors to be m1 = (1.58 ± 0.18) meV , m2 = (9.04 ± 0.42) meV , and m3 = (51.8 ± 3.5) meV . Implications for cosmological observation, beta decay and neutrinoless double beta decays are discussed.

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Ciraldo, Irene, F. Cappuzzello, M. Cavallaro, D. Carbone, S. Burrello, A. Spatafora, A. Gargano et al. "Study of the one-neutron transfer reaction in ¹⁸O + ⁷⁶Se collision at 275 MeV in the context of the NUMEN project". Journal of Physics: Conference Series 2453, n.º 1 (1 de março de 2023): 012013. http://dx.doi.org/10.1088/1742-6596/2453/1/012013.

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Abstract Heavy-ion one-nucleon transfer reactions are promising tools to investigate single-particle configurations in nuclear states, with and without the excitation of the core degrees of freedom. An accurate determination of the spectroscopic amplitudes of these configurations is essential for the study of other direct reactions as well as beta-decays. In this context, the 76Se(18O,17O)77Se one-neutron transfer reaction gives a quantitative access to the relevant single particle orbitals and core polarization transitions built on 76Se. This is particularly relevant, since it provides data-driven information to constrain nuclear structure models for the 76Se nucleus. The excitation energy spectrum and the differential cross section angular distributions of this nucleon transfer reaction was measured at 275 MeV incident energy for the first time using the MAGNEX large acceptance magnetic spectrometer. The data are compared with calculations based on distorted wave Born approximation and coupled channel Born approximation adopting spectroscopic amplitudes for the projectile and target overlaps derived by large-scale shell model calculations and interacting boson-fermion model. These reactions are studied in the frame of the NUMEN project. The NUMEN (NUclear Matrix Elements for Neutrinoless double beta decay) project was conceived at the Istituto Nazionale di Fisica Nucleare–Laboratori Nazionali del Sud (INFN-LNS) in Catania, Italy, aiming at accessing information about the nuclear matrix elements (NME) of neutrinoless double beta decay (0νββ) through the study of the heavy-ion induced double charge exchange (DCE) reactions on various 0νββ decay candidate targets. Among these, the 76Se nucleus is under investigation since it is the daughter nucleus of 76Ge in the 0νββ decay process.

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Bellini, Fabio. "Potentialities of the future technical improvements in the search of rare nuclear decays by bolometers". International Journal of Modern Physics A 33, n.º 09 (30 de março de 2018): 1843003. http://dx.doi.org/10.1142/s0217751x18430030.

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Bolometers are cryogenic calorimeters which feature excellent energy resolution, low energy threshold, high detection efficiency, flexibility in choice of materials, particle identification capability if operated as hybrid devices. After 30 years of rapid progresses, they represent nowadays a leading technology in several fields: particle and nuclear physics, X-ray astrophysics, cosmology. However, further and substantial developments are required to increase the sensitivity to the levels envisioned by future researches. A review of the challenges to be addressed and potentialities of bolometers in the search for rare nuclear decays is given, with particular emphasis to the neutrinoless double beta decay physics case.

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Cao, Jun, Guo-yuan Huang, Yu-Feng Li, Yifang Wang, Liang-Jian Wen, Zhi-zhong Xing, Zhen-hua Zhao e Shun Zhou. "Towards the meV limit of the effective neutrino mass in neutrinoless double-beta decays". Chinese Physics C 44, n.º 3 (março de 2020): 031001. http://dx.doi.org/10.1088/1674-1137/44/3/031001.

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31

Borah, Debasish, Arnab Dasgupta e Sudhanwa Patra. "Neutrinoless double beta decay in minimal left–right symmetric model with universal seesaw". International Journal of Modern Physics A 33, n.º 35 (20 de dezembro de 2018): 1850198. http://dx.doi.org/10.1142/s0217751x18501981.

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We present a detailed discussion on neutrinoless double beta decay [Formula: see text] within left–right symmetric models based on the gauge symmetry of type [Formula: see text] as well as [Formula: see text] where fermion masses including that of neutrinos are generated through a universal seesaw mechanism. We find that one or more of the right-handed neutrinos could be as light as a few keV if left–right symmetry breaking occurs in the range of a few TeV to 100 TeV. With such light right-handed neutrinos, we perform a detailed study of new physics contributions to [Formula: see text] and constrain the model parameters from the latest experimental bound on such a rare decay process. We find that the new physics contribution to [Formula: see text] in such a scenario, particularly the heavy–light neutrino mixing diagrams, can individually saturate the existing experimental bounds, but their contributions to total [Formula: see text] half-life cancel each other due to unitarity of the total [Formula: see text] mass matrix. The effective contribution to half-life therefore, arises from the purely left and purely right neutrino and gauge boson mediated diagrams. We find that the parameter space saturating the [Formula: see text] bounds remains allowed from the latest experimental bounds on charged lepton flavor violating decays like [Formula: see text]. We finally include the bounds from cosmology and supernova to constrain the parameter space of the model.

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GU, PEI-HONG, e UTPAL SARKAR. "COMMON ORIGIN OF BARYON ASYMMETRY AND PROTON DECAY". Modern Physics Letters A 28, n.º 34 (17 de outubro de 2013): 1350159. http://dx.doi.org/10.1142/s0217732313501599.

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A successful baryogenesis theory requires a baryon-minus-lepton number violation if it works before the electroweak phase transition. The leading dimension-6 baryon number violating interactions conserve baryon-minus-lepton number, which dissociated baryogenesis from baryon number violation. We show that in some models, in which the baryon-minus-lepton number is violated in the proton and neutron decays, the baryogenesis and the nucleon decay could have a common origin. We extend the canonical seesaw model with an isotriplet leptoquark scalar and two isotriplet Higgs scalars and allow the Higgs triplet to have a quartic coupling with three leptoquark triplets and a cubic coupling with two Higgs doublets. The decays of the Higgs triplets can thus generate a baryon-minus-lepton asymmetry. The tiny vacuum expectation values of the Higgs triplets can naturally induce a testable proton decay even if the leptoquark is around the TeV scale. The leptoquark associated with any flavor neutrinos can mediate a neutrinoless double beta decay.

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Yates, S. W., E. E. Peters, B. P. Crider, S. Mukhopadhyay e A. P. D. Ramirez. "Relevance of the Nuclear Structure of the Stable Ge Isotopes to the Neutrino-less Double-Beta Decay of 76Ge". EPJ Web of Conferences 232 (2020): 04011. http://dx.doi.org/10.1051/epjconf/202023204011.

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Gamma-ray detection following the inelastic neutron scattering reaction on isotopically enriched material was used to study the nuclear structure of 74Ge. From these measurements, low-lying, low-spin excited states were characterized, new states and their decays were identified, level lifetimes were measured with the Doppler-shift attenuation method (DSAM), multipole mixing ratios were established, and transition probabilities were determined. New structural features in 74Ge were identified, and the reanalysis of older 76Ge data led to the placement of the 2+ member of the intruder band. In addition, a number of previously placed states in 74Ge were shown not to exist. A procedure for future work, which will lead to meaningful data for constraining calculations of the neutrinoless double-beta decay matrix element, is suggested.

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34

KEUM, YONG-YEON. "NEUTRINO MASS BOUNDS". International Journal of Modern Physics: Conference Series 01 (janeiro de 2011): 140–50. http://dx.doi.org/10.1142/s2010194511000195.

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We investigate the way how the total mass sum of neutrinos can be constrained from the neutrinoless double beta decay and cosmological probes with cosmic microwave background (WMAP 3-year results), large scale structures including 2dFGRS and SDSS data sets. First we discuss, in brief, on the current status of neutrino mass bounds from neutrino beta decays and cosmic constrain within the flat ΛCMD model. In addition, we explore the interacting neutrino dark-energy model, where the evolution of neutrino masses is determined by quintessence scalar filed, which is responsable for cosmic acceleration today. Assuming the flatness of the universe, the constraint we can derive from the current observation is ∑ mν < 0.87 eV at the 95 % confidence level, which is consistent with ∑ mν < 0.68 eV in the flat ΛCDM model. Finally we discuss the future prospect of the neutrino mass bound with weak-lensing effects.

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35

Huang, Guo-yuan, e Shun Zhou. "Impact of an eV-mass sterile neutrino on the neutrinoless double-beta decays: A Bayesian analysis". Nuclear Physics B 945 (agosto de 2019): 114691. http://dx.doi.org/10.1016/j.nuclphysb.2019.114691.

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36

Rho, Mannque. "Multifarious Roles of Hidden Chiral-Scale Symmetry: “Quenching” gA in Nuclei". Symmetry 13, n.º 8 (30 de julho de 2021): 1388. http://dx.doi.org/10.3390/sym13081388.

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I discuss how the axial current coupling constant gA renormalized in scale symmetric chiral EFT defined at a chiral matching scale impacts on the axial current matrix elements on beta decays in nuclei with and without neutrinos. The “quenched” gA observed in nuclear superallowed Gamow–Teller transitions, a long-standing puzzle in nuclear physics, is shown to encode the emergence of chiral-scale symmetry hidden in QCD in the vacuum. This enables one to explore how trace-anomaly-induced scale symmetry breaking enters in the renormalized gA in nuclei applicable to certain non-unique forbidden processes involved in neutrinoless double beta decays. A parallel is made between the roles of chiral-scale symmetry in quenching gA in highly dense medium and in hadron–quark continuity in the EoS of dense matter in massive compact stars. A systematic chiral-scale EFT, presently lacking in nuclear theory and potentially crucial for the future progress, is suggested as a challenge in the field.

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37

GUO, WAN-LEI, ZHI-ZHONG XING e SHUN ZHOU. "NEUTRINO MASSES, LEPTON FLAVOR MIXING AND LEPTOGENESIS IN THE MINIMAL SEESAW MODEL". International Journal of Modern Physics E 16, n.º 01 (janeiro de 2007): 1–50. http://dx.doi.org/10.1142/s0218301307004898.

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We present a review of neutrino phenomenology in the minimal seesaw model (MSM), an economical and intriguing extension of the Standard Model with only two heavy right-handed Majorana neutrinos. Given current neutrino oscillation data, the MSM can predict the neutrino mass spectrum and constrain the effective masses of the tritium beta decay and the neutrinoless double-beta decay. We outline five distinct schemes to parameterize the neutrino Yukawa-coupling matrix of the MSM. The lepton flavor mixing and baryogenesis via leptogenesis are investigated in some detail by taking account of possible texture zeros of the Dirac neutrino mass matrix. We derive an upper bound on the CP-violating asymmetry in the decay of the lighter right-handed Majorana neutrino. The effects of the renormalization-group evolution on the neutrino mixing parameters are analyzed, and the correlation between the CP-violating phenomena at low and high energies is highlighted. We show that the observed matter-antimatter asymmetry of the Universe can naturally be interpreted through the resonant leptogenesis mechanism at the TeV scale. The lepton-flavor-violating rare decays, such as μ→e+γ, are also discussed in the supersymmetric extension of the MSM.

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38

Behera, Mitesh Kumar, e Rukmani Mohanta. "Inverse seesaw in A5′ modular symmetry". Journal of Physics G: Nuclear and Particle Physics 49, n.º 4 (22 de fevereiro de 2022): 045001. http://dx.doi.org/10.1088/1361-6471/ac4d7a.

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Abstract We make an investigation of modular Γ 5 ′ ≃ A 5 ′ group in inverse seesaw framework. Modular symmetry is advantageous because it reduces the usage of extra scalar fields significantly. Moreover, the Yukawa couplings are expressed in terms of Dedekind eta functions, which also have a q expansion form, generally utilized to achieve numerical simplicity. Our proposed model includes six heavy fermion superfields i.e., N R i , S L i and a weighton. The study of neutrino phenomenology becomes simplified and effective by the usage of A 5 ′ modular symmetry, which provides us a well defined mass structure for the lepton sector. Here, we observe that all the neutrino oscillation parameters, as well as the effective electron neutrino mass in neutrinoless double beta decay can be successfully accommodated in this model. We also briefly discuss the lepton flavor violating decays ℓ i → ℓ j γ, the collider bound on Z′ mass and comment on non-unitarity of lepton mixing matrix.

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39

Bouet, R., J. Busto, V. Cecchini, C. Cerna, P. Charpentier, M. Chapellier, A. Dastgheibi-Fard et al. "R2D2 TPC: first Xenon results". Journal of Instrumentation 18, n.º 10 (1 de outubro de 2023): T10001. http://dx.doi.org/10.1088/1748-0221/18/10/t10001.

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Abstract Radial time projection chambers (TPC), already employed in the search for rare phenomena such as light Dark Matter candidate, could provide a new detection approach for the search of neutrinoless double beta decay (ββ0ν). The assessment of the performances of such a detector for ββ0ν search is indeed the goal of the Rare Decays with Radial Detector (R2D2) R&D. Promising results operating a spherical TPC with argon up to 1 bar have been published in 2021. Supplementary measurements were recently taken extending the gas pressure range up to 3 bar. In addition, a comparison between two detector geometries, namely spherical (SPC for spherical proportional counter) and cylindrical (CPC for cylindrical proportional counter), was performed. Using a relatively simple gas purification system the CPC detector was also operated with xenon at 1 bar: an energy resolution of 1.4% full-width at half-maximum was achieved for drift distances up to 17 cm. Much lower resolution was observed with the SPC. These results are presented in this article.

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40

Arnold, R., C. Augier, J. Baker, A. S. Barabash, V. Brudanin, A. J. Caffrey, E. Caurier et al. "Limits on different majoron decay modes of 100Mo and 82Se for neutrinoless double beta decays in the NEMO-3 experiment". Nuclear Physics A 765, n.º 3-4 (fevereiro de 2006): 483–94. http://dx.doi.org/10.1016/j.nuclphysa.2005.11.015.

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Liu, Jun-Hao, e Shun Zhou. "Another look at the impact of an eV-mass sterile neutrino on the effective neutrino mass of neutrinoless double-beta decays". International Journal of Modern Physics A 33, n.º 02 (20 de janeiro de 2018): 1850014. http://dx.doi.org/10.1142/s0217751x18500148.

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The possible existence of an eV-mass sterile neutrino, slightly mixing with ordinary active neutrinos, is not yet excluded by neutrino oscillation experiments. Assuming neutrinos to be Majorana particles, we explore the impact of such a sterile neutrino on the effective neutrino mass of neutrinoless double-beta decays [Formula: see text], where [Formula: see text] and [Formula: see text] (for [Formula: see text]) denote respectively the absolute masses and the first-row elements of the [Formula: see text] neutrino flavor mixing matrix [Formula: see text], for which a full parametrization involves three Majorana-type CP-violating phases [Formula: see text]. A zero effective neutrino mass [Formula: see text] is possible, no matter whether three active neutrinos take the normal or inverted mass ordering, and its implications for the parameter space are examined in great detail. In particular, given the best-fit values of [Formula: see text] and [Formula: see text] from the latest global analysis of neutrino oscillation data, a three-dimensional view of [Formula: see text] in the [Formula: see text]-plane is presented and further compared with that of the counterpart [Formula: see text] in the absence of any sterile neutrino.

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Carbone, D., F. Cappuzzello, C. Agodi, M. Cavallaro, L. Acosta, D. Bonanno, D. Bongiovanni et al. "The nuclear matrix elements of 0νββ decay and the NUMEN project at INFN-LNS". EPJ Web of Conferences 194 (2018): 02001. http://dx.doi.org/10.1051/epjconf/201819402001.

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The goal of NUMEN project is to access experimentally driven information on Nuclear Matrix Elements (NME) involved in the neutrinoless double beta decay (0νββ), by high-accuracy measurements of the cross sections of Heavy Ion (HI) induced Double Charge Exchange (DCE) reactions. The knowledge of the nuclear matrix elements is crucial to infer the neutrino average masses from the possible measurement of the half-life of 00νββ decay and to compare experiments on different isotopes. In particular, the (18O, 18Ne) and (20Ne, 20O) reactions are performed as tools for β+β+ and β-β- decays, respectively. The experiments are performed at INFN - Laboratory Nazionali del Sud (LNS) in Catania using the Superconducting Cyclotron (CS) to accelerate the beams and the MAGNEX magnetic spectrometer to detect the reaction products. The measured cross sections are very low, limiting the present exploration to few selected isotopes of interest in the context of typically low-yield experimental runs. In order to make feasible a systematic study of all the candidate nuclei, a major upgrade of the LNS facility is foreseen to increase the experimental yield of about two orders of magnitude. To this purpose, frontier technologies are going to be developed for both the accelerator and the detection systems. In parallel, advanced theoretical models will be developed to extract the nuclear structure information from the measured cross sections.

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43

Pereira, G., C. Silva e V. N. Solovov. "Energy resolution of the LZ detector for high-energy electronic recoils". Journal of Instrumentation 18, n.º 04 (1 de abril de 2023): C04007. http://dx.doi.org/10.1088/1748-0221/18/04/c04007.

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Abstract The LUX-ZEPLIN (LZ) detector is a dual-phase liquid xenon time projection chamber (TPC) installed at the Sanford Underground Research Facility (Lead, South Dakota) at a depth of 1478 meters. Although the main objective of LZ is the direct detection of dark matter, its low background environment allows for the search of other rare processes, such as the neutrinoless double beta decay of xenon isotopes 134Xe and 136Xe with the respective Q-values of 826 keV and 2458 keV. The sensitivity of the detector to these decays is directly determined by the energy resolution, which, in turn, is degraded by non-uniformities in detector response. In this work, we present a novel method to correct, in the data, the non-uniformity of the light collected by an array of photosensors in a scintillation detector. This method is based on the knowledge of the light response functions of individual photosensors. With these techniques, we report, at a very early phase of the detector operations, a state-of-the-art energy resolution (σ/μ) of (0.67 ± 0.01)% at 2614 keV for the fiducial volume of 5.6 tonnes of liquid xenon.

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44

Arnold, R., C. Augier, J. Baker, A. Barabash, D. Blum, V. Brudanin, A. J. Caffrey et al. "Limits on different Majoron decay modes of Mo, Cd, Se and Zr for neutrinoless double beta decays in the NEMO-2 experiment". Nuclear Physics A 678, n.º 3 (outubro de 2000): 341–52. http://dx.doi.org/10.1016/s0375-9474(00)00326-2.

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Jokiniemi, Lotta, Jouni Suhonen e Hiroyasu Ejiri. "Magnetic HexadecapoleγTransitions and Neutrino-Nuclear Responses in Medium-Heavy Nuclei". Advances in High Energy Physics 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/8417598.

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Neutrino-nuclear responses in the form of squares of nuclear matrix elements, NMEs, are crucial for studies of neutrino-induced processes in nuclei. In this work we investigate magnetic hexadecapole (M4) NMEs in medium-heavy nuclei. The experimentally derived NMEs,MEXP(M4), deduced from observed M4γtransition half-lives are compared with the single-quasiparticle (QP) NMEs,MQP(M4), and the microscopic quasiparticle-phonon model (MQPM) NMEsMMQPM(M4). The experimentally derived M4 NMEs are found to be reduced by a coefficientk≈0.29with respect toMQP(M4) and byk≈0.33with respect toMMQPM(M4). The M4 NMEs are reduced a little by the quasiparticle-phonon correlations of the MQPM wave functions but mainly by other nucleonic and nonnucleonic correlations which are not explicitly included in the MQPM. The found reduction rates are of the same order of magnitude as those for magnetic quadrupoleγtransitions and Gamow-Teller (GT) and spin-dipole (SD)βtransitions. The impacts of the found reduction coefficients on the magnitudes of the NMEs involved in astroneutrino interactions and neutrinoless double beta decays are discussed.

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Tang, Po Yu Boey. "Analysis of Dark Matter Searching Based on Liquid Xenon: XENON, LUX-ZEPLIN and DARWIN". Highlights in Science, Engineering and Technology 88 (29 de março de 2024): 604–11. http://dx.doi.org/10.54097/r3jq5d19.

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This paper delves into the ongoing quest to uncover the mysteries of dark matter, an endeavor that has captivated the scientific community for nearly a century. Focusing on the utilization of liquid xenon scintillators, specifically in the XENONnT and LZ experiments, it explores the remarkable properties of liquid xenon that make it a prime candidate for detecting Weakly Interacting Massive Particles (WIMPs), a leading dark matter candidate. These experiments have achieved significant milestones, placing stringent constraints on the WIMP-nucleon interaction cross section, yet face the challenge of the “neutrino fog” at lower energies, necessitating innovative solutions like advanced statistical methods and machine learning. The paper also highlights the promising future of dark matter detection through projects like DARWIN and the XLZD Consortium, which aim to construct next-generation liquid xenon detectors with increased target masses. These endeavors hold the potential to significantly enhance sensitivity, potentially unraveling the nature of dark matter. Furthermore, the versatility of liquid xenon detectors extends to the study of neutrinos, encompassing neutrinoless double-beta decays and solar pp neutrinos. These results shed light on guiding further exploration of dark matter searching.

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Horoi, Mihai. "Double Beta Decay: A Shell Model Approach". Physics 4, n.º 4 (26 de setembro de 2022): 1135–49. http://dx.doi.org/10.3390/physics4040074.

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Studies of weak interaction in nuclei are important tools for testing different aspects of the fundamental symmetries of the Standard Model. Neutrinoless double beta decay offers an unique venue of investigating the possibility that neutrinos are Majorana fermions and that the lepton number conservation law is violated. Here, I use a shell model approach to calculate the nuclear matrix elements needed to extract the lepton-number-violating parameters of a few nuclei of experimental interest from the latest experimental lower limits of neutrinoless double beta decay half-lives. The analysis presented here could reveal valuable information regarding the dominant neutrinoless double beta decay mechanism if experimental half-life data become available for different isotopes. A complementary shell model analysis of the two-neutrino double beta decay nuclear matrix elements and half-lives is also presented.

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Zavarise, Paolo. "THE GERDA EXPERIMENT: STATUS AND FUTURE PLANS". Acta Polytechnica 53, A (18 de dezembro de 2013): 786–89. http://dx.doi.org/10.14311/ap.2013.53.0786.

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The GERDA experiment is searching for the neutrinoless double beta decay of 76Ge. An observation of the neutrinoless double beta decay will not only prove lepton number violation by two units, but also that the neutrino is its own anti-particle, thus of Majorana type. The status of the experiment will be presented.

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49

Garfagnini, Alberto. "Neutrinoless double beta decay experiments". International Journal of Modern Physics: Conference Series 31 (janeiro de 2014): 1460286. http://dx.doi.org/10.1142/s2010194514602865.

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Neutrinoles double beta decay is the only process known so far able to test the neutrino intrinsic nature: its experimental observation would imply that the lepton number is violated by two units and prove that neutrinos have a Majorana mass components, being their own anti-particle. While several experiments searching for such a rare decay have been performed in the past, a new generation of experiments using different isotopes and techniques have recently released their results or are raking data and will provide new limits, should no signal be observed, in the next few years to come. The present contribution reviews the latest public results on double beta decay searches and gives an overview on the expected sensitivities of the experiments in construction which will be able to set stronger limits in the near future.

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CREMONESI, OLIVIERO. "NEUTRINOLESS DOUBLE BETA DECAY". International Journal of Modern Physics: Conference Series 12 (janeiro de 2012): 80–89. http://dx.doi.org/10.1142/s2010194512006289.

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Neutrinoless double beta decay (ββ(0ν)) is presently the only practical tool for probing the character of neutrinos. In case neutrinos are Majorana particles ββ(0ν) can provide also fundamental informations on their absolute mass scale. The present status of experiments searching for ββ(0ν) is reviewed and the most relevant results discussed. A possibility to observe ββ(0ν) at a neutrino mass scale in the range 10-50 meV looks possible according to our present knowledge of the neutrino masses and mixing parameters. A review of the future projects and of the most relevant parameters contributing to the experimental sensitivity iss finally outlined.

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