Fermi nuclear matrix element of allowed isospin-hindered positron decay of /sup 56/Co

Journal Article · Fri Apr 01 04:00:00 EST 1988 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.37.1672· OSTI ID:5421388

Saw, E L; Yap, C T

The experimental measurement of the asymmetry parameter of the ..beta../sup +/ decay from the 4/sup +/ ground state of /sup 56/Co to the 2.085 MeV 4/sup +/ state of /sup 56/Fe not only yields a value for the Fermi nuclear matrix element M/sub F/, but also has significant Fermi-Gamow-Teller mixing and is of interest for a time-reversal invariance test of the weak interaction. To date, nine such measurements have been made and the values of the M/sub F/ fall into two groups: M/sub F/approx.10/sup -5/ and M/sub F/approx.(3--5) x 10/sup -4/. Our theoretical calculation using the Nilsson model and a one-body spheroidal Coulomb potential yields M/sub F/ = 2.3 x 10/sup -4/ for ..beta.. = 0.1 and M/sub F/ = 6 x 10/sup -4/ for ..beta.. = 0.2, which are in reasonable agreement with the experimental values of M/sub F/approx.(3--5) x 10/sup -4/.

• Research Organization: Department of Physics, National University of Singapore, Singapore 0511
• OSTI ID: 5421388
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 37:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

653005* -- Nuclear Theory-- Radioactive Decay
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BASIC INTERACTIONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY
BETA-PLUS DECAY RADIOISOTOPES
COBALT 56
COBALT ISOTOPES
COULOMB FIELD
COUPLING CONSTANTS
DAYS LIVING RADIOISOTOPES
DECAY
DEFORMED NUCLEI
ELECTRIC FIELDS
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
EVEN-EVEN NUCLEI
GAMOW-TELLER RULES
INTERACTIONS
INTERMEDIATE MASS NUCLEI
INVARIANCE PRINCIPLES
IRON 56
IRON ISOTOPES
ISOSPIN
ISOTOPES
MATHEMATICAL MODELS
MATRIX ELEMENTS
NILSSON-MOTTELSON MODEL
NUCLEAR MODELS
NUCLEI
ODD-ODD NUCLEI
PARITY
PARTICLE PROPERTIES
RADIOISOTOPES
SELECTION RULES
SPIN
STABLE ISOTOPES
T INVARIANCE
WEAK INTERACTIONS