Study of N and M electron capture by holmium-163 and group theoretic studies of nuclear collective states
An investigation of the electron capture decay of isotope WTHo is reported. The WTHo nucleus decays by electron capture with the lowest Q value of any known US -decay process. This decay is sensitive to the effects of a finite electron neutrino mass. Very low energy N and M orbital electron capture events observed from a gaseous form of WTHo internally dispersed in a heated gas counter are studied. The design and construction of the high temperature gas proportional detector are presented. The preparation of volatile radioactive metal sources is discussed. The ratio lambda/sub N//lambda/sub M/ = 3.86 +/- 0.12 provides a constraint on Q/sub ec/ and M/sub nu/. For M/sub nu/ = 0, Q/sub ec/ is calculated to be 2600 +/- 30 eV. Using an independent value for Q/sub ec/, the range for M/sub nu/ is 1200 eV. The combination of this N-to-M ratio and an independent study of the M-x-ray inner bremsstrahlung radiation by another member of the research group is used to place an upper limit on m/sub nu/ of 225 eV. An interacting cylindrical phonon model, describing rotating cylindrical intrinsic states is presented.
- Research Organization:
- Princeton Univ., NJ (USA)
- OSTI ID:
- 6220894
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
A=150-189
Experimental-- Radioactive Decay-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA DECAY
BRANCHING RATIO
DATA
DECAY
ELECTRON CAPTURE DECAY
ELECTRON NEUTRINOS
ELECTRONIC STRUCTURE
ELEMENTARY PARTICLES
ENERGY
EXPERIMENTAL DATA
FERMIONS
HALF-LIFE
HOLMIUM 163
HOLMIUM ISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEPTONS
LIE GROUPS
LIMITING VALUES
M SHELL
MASS
MASSLESS PARTICLES
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
N SHELL
NEUTRINOS
NUCLEAR MODELS
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
PHONONS
PROPORTIONAL COUNTERS
Q-VALUE
QUASI PARTICLES
RADIATION DETECTORS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
REST MASS
SECONDS LIVING RADIOISOTOPES
SU GROUPS
SU-3 GROUPS
SYMMETRY GROUPS
YEARS LIVING RADIOISOTOPES