Fermi-Gamow-Teller mixing in the allowed isospin-hindered positron decay of /sup 56/Co

Journal Article · Mon Jul 12 04:00:00 EDT 1982 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.49.109· OSTI ID:6711469

Groves, J L; Lee, W P; Sabbas, A M; Chen, M E; Kravitz, P S; Chirovsky, L M; Wu, C S

A new high-precision measurement of the asymmetry coefficient, A/sub ..beta../, for the positron decay of polarized /sup 56/Co is reported: A/sub ..beta../ = +0.359 +- 0.009. If one assumes the V-A form of the weak interaction and time-reversal invariance, the Fermi-Gamow-Teller mixing ratio, y = C/sub V/M/sub F//C/sub A/M/sub GT/ is then -0.091 +- 0.005. Since y is nonzero and isospin is not conserved, /sup 56/Co ..beta../sup +/ decay is a good candidate for sensitive time-reversal invariance tests of the weak interaction.

• Research Organization: Physics Department, Columbia University, New York, New York 10027
• OSTI ID: 6711469
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 49:2; ISSN PRLTA
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ASYMMETRY
BASIC INTERACTIONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY
BETA-PLUS DECAY RADIOISOTOPES
COBALT 56
COBALT ISOTOPES
DATA
DAYS LIVING RADIOISOTOPES
DECAY
DISTRIBUTION
ELECTRON CAPTURE RADIOISOTOPES
EXPERIMENTAL DATA
FERMI INTERACTIONS
GAMOW-TELLER RULES
INFORMATION
INTERACTIONS
INTERMEDIATE MASS NUCLEI
INVARIANCE PRINCIPLES
ISOTOPES
MIXING RATIO
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORIENTED NUCLEI
RADIOISOTOPES
T INVARIANCE
V-A THEORY
WEAK INTERACTIONS