Published October 1990 | Version v1
Report Restricted

Evidence for the emission of a massive neutrino in nuclear beta decay

Creators

  • 1. California Univ., Berkeley, CA (USA). Center for Particle Astrophysics
  • 2. Lawrence Berkeley Lab., CA (USA)
  • 3. Tennessee Technological Univ., Cookeville, TN (USA). Dept. of Physics
  • 4. California Univ., Berkeley, CA (USA). Dept. of Materials Science and Mineral Engineering

Description

We have studied the β-spectrum of 14C using a germanium detector containing a crystal with 14C dissolved in it. We find a feature in the β-spectrum 17 keV below the endpoint which can be explained by the hypothesis that there is a heavy neutrino emitted in the β-decay of 14C with a mass of 17 ± 2 keV and an emission probability of 1.40 ± 0.45%. In addition, we have studied the inner bremsstrahlung spectrum of 55Fe and also find indications of the emission of a ∼ 17-keV neutrino. These results are consistent with observations of similar anomalies in the β-decays of 3H and 35S. 29 refs., 7 figs

Availability note (English)

MF available from INIS under the Report Number; OSTI as DE91009737; NTIS; INIS; US Govt. Printing Office Dep.

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Additional details

Publishing Information

Imprint Pagination
11 p.
Report number
LBL--30144

Conference

Title
rare nuclear decays and fundamental processes.
Acronym
14. Europhysics conference on nuclear physics
Dates
22-26 Oct 1990.
Place
Bratislava (Czechoslovakia).

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
22049404
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S73: NUCLEAR PHYSICS AND RADIATION PHYSICS; S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
Resource subtype / Literary indicator
Conference, Numerical Data
Descriptors DEI
BETA DECAY; BETA SPECTRA; BREMSSTRAHLUNG; CARBON 14; EXPERIMENTAL DATA; GE SEMICONDUCTOR DETECTORS; INTERNAL BREMSSTRAHLUNG; IRON 55; NEUTRINO DETECTION; NEUTRINOS
Descriptors DEC
BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CARBON ISOTOPES; DATA; DECAY; DETECTION; ELECTROMAGNETIC RADIATION; ELECTRON CAPTURE RADIOISOTOPES; ELEMENTARY PARTICLES; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; FERMIONS; INFORMATION; INTERMEDIATE MASS NUCLEI; IRON ISOTOPES; ISOTOPES; LEPTONS; LIGHT NUCLEI; MASSLESS PARTICLES; MEASURING INSTRUMENTS; NUCLEAR DECAY; NUCLEI; NUMERICAL DATA; RADIATION DETECTION; RADIATION DETECTORS; RADIATIONS; RADIOISOTOPES; SEMICONDUCTOR DETECTORS; SPECTRA; YEARS LIVING RADIOISOTOPES

Optional Information

Contract/Grant/Project number
Contract AC03-76SF00098; FG05-87ER40314
Funding organization
USDOE, Washington, DC (USA); National Science Foundation, Washington, DC (USA).
Secondary number(s)
CONF-9010128--4.