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New limits on the neutrino mass, lepton conservation, and no-neutrino double beta decay of /sup 76/Ge

Journal Article · · Phys. Rev. Lett.; (United States)
; ; ; ; ;
A continuing search for the no-neutrino mode of the double beta decay of /sup 76/Ge has resulted in a new lower limit T/sub 1/2//sup 0nu/ > or =1.7 x 10/sup 22/ yr. This value corresponds to a 90% confidence level determined with a maximum-likelihood analysis of the energy interval 2041 +- 2 keV. Combined with recent shell-model calculations, the data imply m/sub ..nu../< or =10 eV and a limit on lepton nonconservation Vertical BaretaVertical Bar< or =2.4 x 10/sup -5/. In the context of the shell model, the data imply that the electron neutrino is not a Majorana mass eigenstate.
Research Organization:
Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208
DOE Contract Number:
AC06-76RL01830
OSTI ID:
6235597
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 50:10; ISSN PRLTA
Country of Publication:
United States
Language:
English

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Related Subjects

645102 -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Weak Interactions &amp; Properties
651622* -- Nuclear Properties &amp; Reactions
A=59-89
Experimental-- Radioactive Decay-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA DECAY
BETA-MINUS DECAY
DATA
DECAY
EIGENSTATES
ELECTRON NEUTRINOS
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FERMIONS
GERMANIUM 76
GERMANIUM ISOTOPES
HALF-LIFE
INFORMATION
INTERMEDIATE MASS NUCLEI
INVARIANCE PRINCIPLES
ISOTOPES
LEPTON NUMBER
LEPTONS
LIMITING VALUES
MAJORANA THEORY
MASS
MASSLESS PARTICLES
MATHEMATICAL MODELS
NEUTRINOS
NUCLEAR MODELS
NUCLEI
NUMERICAL DATA
SHELL MODELS
STABLE ISOTOPES
TELLURIUM 128
TELLURIUM 130
TELLURIUM ISOTOPES