Further, a novel approach for determining the effective axial-vector coupling constant is proposed. The theoretical and experimental issues relevant to neutrinoless double-beta decay are reviewed. In this context an improved formula for the 2ν ββ-decay is presented. Experiments studying the 2ν ββ-decay are currently approaching a qualitatively new level, where high-precision measurements are performed not only for half-lives but for all other observables of the process. ![]() That will allow to determine masses of neutrinos once the 0ν ββ-decay, which occurs if the neutrino is a massive Majorana particle and the total lepton number is not onserved, will be observed. The theoretical and experimental study of the two-neutrino double-beta decay (2ν ββ-decay) is of crucial importance for reliable calculation of matrix elements governing the neutrinoless double-beta decay (0ν ββ-decay). ![]() 1069–1086 New Parameterization in Muon Decay and the Type of Emitted Neutrino.Fedor Šimkovic 1 ,2 ,3 *, Rastislav Dvornický 1 ,2 ** and Dušan Štefánik 1 ***Ĭomenius University, Mlynská dolina F1, SK-842 48 Bratislava, Slovakiaĭzhelepov Laboratory of Nuclear Problems, JINR, 141980 Dubna, Russiaīogoliubov Laboratory of Theoretical Physics, JINR, 141980 Dubna, RussiaĬzech Technical University in Prague, 128-00 Prague, Czech Republic 845–871 New Parameterization in Muon Decay and the Type of Emitted Neutrino Masaru Doi, Tsuneyuki Kotani and Hiroyuki Nishiura The emission of beta radiation provides evidence that neutrons and protons are made up of quarks. Lim, Eiichi Takasugi and Motohiko Yoshimura 1367–1375 A Variety of Lepton Number Violating Processes Related to Majorana Neutrino Masses C. 219–231 Single and Double β Decay in N ≈ Z Nuclei Kazunari Kaneko and Munetake Hasegawa ![]() 977–985 Double Beta Decay Constraint on Composite Neutrinos Eiichi Takasugi 1097–1103 Compoiste Neutrinos and Double Beta Decay Eiichi Takasugi With the realization that neutrinos play a key role in a number of astrophysical processes, a new and massive field of research known as 'neutrino astronomy' has emerged in the past two decades. (In fact, it is an electron anti-neutrino that is produced in beta decay). 139–159 Neutrinoless Modes of Double Beta Decay Masaru Doi and Tsuneyuki Kotani The neutrino is also known to have its own anti-particle, the anti-neutrino. 1207–1231 Neutrino Emitting Modes of Double Beta Decay Masaru Doi and Tsuneyuki Kotani In 1911 Lise Meitner and Otto Hahn performed an experiment that. 183–191 Production and Decay of a Pair of Heavy Neutrinos Jun Kogo and S. Historically, the study of beta decay provided the first physical evidence of the neutrino. 2101–2127 Double Beta Decays and Neutrino Masses Hiroyasu Ejiri Journal of the Physical Society of Japan 74 (2005) pp. 7–10 Nuclear Matrix Elements for Two-Neutrino Double Beta Decays Hiroyasu Ejiri and Hiroshi Toki Journal of the Physical Society of Japan 65 (1996) pp. 339–343 Double Beta Decays of 116Cd Hiroyasu Ejiri, Ken-ichi Fushimi, Ryuta Hazama, Michio Kawasaki, Vasiliy Kouts, Nobuyuki Kudomi, Kyo Kume, Koichiro Nagata, Hideaki Ohsumi, Kenji Okada, Hirokazu Sano, Toshio Senoo, Tokushi Shibata, Tatsushi Shima, Jun-ichi Tanaka and Yuri Zdesenko First it will signal that lepton number is not conserved and the neutrinos are Majorana particles. Journal of the Physical Society of Japan 64 (1995) pp. beta decay (DBD) will have important consequences. The possible mixing schemes of the neutrino system are explored. Neutrinoless double beta decay (0) is a posited lepton number violating decay whose search is an increasingly active field in modern astroparticle physics. In part III, the above bounds are compared with those from other processes like the 3H decay, the neutrino oscillation, the π-µ-e decay, etc. Why are we interested in neutrinoless double beta decay The recent discovery of neutrino oscillations clearly indicates that neutrinos do have mass. The constraints on the effective neutrino mass and the effective right-handed weak interaction parameters are derived from the present experimental data. Previously, it has been repeatedly suggested that the radioactive decay of nuclei is not a random phenomenon and can occur under the influence of a neutrino. ![]() Various corrections due to the vanishing terms in the closure approximation and the higher spherical waves of leptons are estimated. Part II is devoted to the theoretical investigation of the double beta decay and the analysis on the experimental data. It is shown why the Dirac neutrino has a freedom of the phase transformation to guarantee the lepton number conservation, while the Majorana neutrino does not. This review consists of three parts: Various properties of the quantized neutrino fields are summarized in part I from the viewpoint that a Dirac neutrino consists of two Majorana neutrinos with a degenerate mass but with opposite CP sings.
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