Beta decay and muon capture in the A = 12 nuclei: Second-class currents and conserved-vector current

Journal Article · Fri Jul 01 04:00:00 EDT 1977 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.16.397· OSTI ID:7319116

Hwang, W P; Primakoff, H

A fairly detailed analysis is given of the available experimental data on /sup 12/B ..-->.. /sup 12/Ce/sup -/anti ..nu../sub e/, /sup 12/N ..-->.. /sup 12/Ce/sup +/..nu../sub e/, and ..mu../sup -12/C ..-->.. ..nu../sub ..mu../ /sup 12/B making use of the ''elementary-particle'' treatment. Our results indicate that the variation with energy of the asymmetry coefficients obtained by Sugimoto et al. cannot be reconciled with the observed value of the muon capture rate on the hypothesis (A) of gross violation of (''strong'') conserved vector current and absence of second-class axial currents and can be reconciled only with great difficulty on the alternative hypothesis (B) of validity of (strong) conserved vector current and presence of relatively large second-class axial currents. On the other hand, a good fit to the observed muon capture rate can be obtained on the hypothesis (C) of (strong) conserved vector current, (''suitably corrected'') partially conserved axial vector current, and absence of second-class axial currents. This last hypothesis leads, of course, to a prediction for the variation with energy of the asymmetry coefficients in contradiction to the results of Sugimoto et al. We also find that the magnitude of the recoil /sup 12/B polarization obtained by Possoz et al. agrees with that calculated on hypothesis (C) but not with those calculated on hypotheses (A) or (B).

• Research Organization: Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19174
• OSTI ID: 7319116
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 16:1; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651312* -- Nuclear Properties & Reactions
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALGEBRAIC CURRENTS
BASIC INTERACTIONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY
BETA-PLUS DECAY RADIOISOTOPES
BORON 12
BORON ISOTOPES
CAPTURE
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
COULOMB FIELD
CURRENTS
CVC THEORY
DECAY
ELECTRIC FIELDS
ENERGY SPECTRA
FORM FACTORS
INTERACTIONS
ISOTOPES
LEPTON REACTIONS
LEPTONIC DECAY
LIGHT NUCLEI
MUON REACTIONS
NITROGEN 12
NITROGEN ISOTOPES
NUCLEAR REACTIONS
NUCLEI
ODD-ODD NUCLEI
PARTICLE DECAY
PARTICLE PROPERTIES
RADIOISOTOPES
SECOND-CLASS CURRENTS
SECONDS LIVING RADIOISOTOPES
SPECTRA
TARGETS
WEAK INTERACTIONS
WEAK PARTICLE DECAY