Fermi to Gamow-Teller mixing ratios in the nuclear beta decays of /sup 58/Co and /sup 56/Co
Thesis/Dissertation
·
OSTI ID:6244755
The Fermi to Gamow-Teller mixing ratios, y = C/sub v/M/sub f//Ca/sub A/M/sub GT/, in the isospin-hindered beta decays (..delta..J = 0, T = /sup + -/1) of /sup 58/Co and /sup 56/Co have been accurately determined from extensive and detailed studies of the directional distributions of beta rays and gamma rays emitted from oriented /sup 58/Co and /sup 56/Co nuclei. The cobalt nuclei were oriented in a thin foil of permendur (49% Co, 49% Fe, and 2% V) magnetically saturated at ultralow temperatures (10/sup -20/K). Beta-ray and gamma-ray spectra were measured, with a Si(Li) detector and a Ge(Li) detector respectively, at four different angles with respect to the nuclear orientation axis. The gamma-ray background in the beta-ray spectra is removed by means of a mechanical shutter. The beta-ray asymmetries and the gamma-ray anisotropies were determined independently at each angle by normalizing the cold (approx. = 10/sup -20/K) spectra by the corresponding warm (4.2/sup 0/K) spectra taken at the same angle. Necessary corrections made on the beta-ray spectra due to the various experimental effects are described in detail. The experimental beta-ray asymmetries after the proper corrections were found to be in very good agreement with the theoretical expectations over a wide energy region. Including all estimated systematic errors, the beta-ray asymmetry parameters, A/sub ..beta../, were determined to be A/sub ..beta..//sup 58/ = 0.341 +- 0.020 for /sup 58/Co and A/sup 56/ = 0.352 +- 0.015 for /sup 56/Co. The Fermi to Gamow-Teller mixing ratios y corresponding to these A/sub ..beta../'s are y/sup 58/ = -0.005 +- 0.012 for /sup 58/Co and y/sup 56/ = -0.086 +- 0.008 for /sup 56/Co. The obtained result of y/sup 56/ is in very serious disagreement with the latest measurement.
- Research Organization:
- Columbia Univ., New York (USA)
- OSTI ID:
- 6244755
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
651522* -- Nuclear Properties & Reactions
A=39-58
Experimental-- Radioactive Decay-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY COEFFICIENTS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA SPECTRA
BETA-PLUS DECAY RADIOISOTOPES
COBALT 56
COBALT 58
COBALT ISOTOPES
DATA
DAYS LIVING RADIOISOTOPES
DECAY
ELECTRON CAPTURE RADIOISOTOPES
EXPERIMENTAL DATA
GAMMA SPECTRA
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MIXING RATIO
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
RADIOISOTOPES
SPECTRA
A=39-58
Experimental-- Radioactive Decay-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY COEFFICIENTS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA SPECTRA
BETA-PLUS DECAY RADIOISOTOPES
COBALT 56
COBALT 58
COBALT ISOTOPES
DATA
DAYS LIVING RADIOISOTOPES
DECAY
ELECTRON CAPTURE RADIOISOTOPES
EXPERIMENTAL DATA
GAMMA SPECTRA
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MIXING RATIO
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
RADIOISOTOPES
SPECTRA