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), Vol. 50:10
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
GERMANIUM 76
BETA-MINUS DECAY
NEUTRINOS
MASS
EIGENSTATES
ELECTRON NEUTRINOS
EXPERIMENTAL DATA
HALF-LIFE
INVARIANCE PRINCIPLES
LEPTON NUMBER
LIMITING VALUES
MAJORANA THEORY
SHELL MODELS
TELLURIUM 128
TELLURIUM 130
BETA DECAY
DATA
DECAY
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
FERMIONS
GERMANIUM ISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
LEPTONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEI
NUMERICAL DATA
STABLE ISOTOPES
TELLURIUM ISOTOPES
651622* - Nuclear Properties & Reactions
A=59-89
Experimental- Radioactive Decay- (-1987)
645102 - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
GERMANIUM 76
BETA-MINUS DECAY
NEUTRINOS
MASS
EIGENSTATES
ELECTRON NEUTRINOS
EXPERIMENTAL DATA
HALF-LIFE
INVARIANCE PRINCIPLES
LEPTON NUMBER
LIMITING VALUES
MAJORANA THEORY
SHELL MODELS
TELLURIUM 128
TELLURIUM 130
BETA DECAY
DATA
DECAY
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
FERMIONS
GERMANIUM ISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
LEPTONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEI
NUMERICAL DATA
STABLE ISOTOPES
TELLURIUM ISOTOPES
651622* - Nuclear Properties & Reactions
A=59-89
Experimental- Radioactive Decay- (-1987)
645102 - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties