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Measurement of the correlation between nuclear alignment and electron direction in /sup 12/B decay as a direct search for the second-class axial-vector current

Journal Article · · Phys. Rev. Lett.; (United States)
; ; ; ; ; ; ;
The alignment correlation term A..cap alpha../sub -/EP/sub 2/(costheta) has been measured in the ..beta../sup -/ decay /sup 12/B ..-->.. /sup 12/C(g.s) by a novel technique. The result, ..cap alpha../sub -/(E/sub 0/) = - (0.1 +- 0.2)/GeV, indicates that the conserved vector current weak-magnetism form factor, F/sub M/, is essentially compensated here by the weak electricity (induced tensor) form factor F/sub E/. Using the decomposition of F/sub E/ = F/sub E//sup(1) + F/sub E//sup(2) into first- and second-class parts, as well as a reliable estimate of F/sub E//sup(1), we conclude that F/sub E//sup(2) is small compared to F/sub M/, and compatible with zero.
Research Organization:
Institut de Physique Corpusculaire, Universite Catholique de Louvain, Louvain, Louvain-la-Neuve, Belgium
OSTI ID:
5166924
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 40:5; ISSN PRLTA
Country of Publication:
United States
Language:
English

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Related Subjects

645302 -- High Energy Physics-- Particle Invariance Principles & Symmetries-- Applications to Electromagnetic & Weak Interactions-- (-1987)
651322* -- Nuclear Properties & Reactions
A=6-19
Experimental-- Radioactive Decay-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALGEBRAIC CURRENTS
ANGULAR DISTRIBUTION
AXIAL-VECTOR CURRENTS
BASIC INTERACTIONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY
BETA-MINUS DECAY RADIOISOTOPES
BORON 12
BORON ISOTOPES
CARBON 12
CARBON ISOTOPES
CORRELATIONS
CURRENTS
DECAY
DISTRIBUTION
ELECTROMAGNETIC FORM FACTORS
ENERGY LEVELS
EVEN-EVEN NUCLEI
FORM FACTORS
GROUND STATES
INTERACTIONS
ISOTOPES
LEPTONIC DECAY
LIGHT NUCLEI
NUCLEAR ALIGNMENT
NUCLEI
ODD-ODD NUCLEI
ORIENTED NUCLEI
PARTICLE DECAY
PARTICLE PROPERTIES
POLARIZATION
RADIOISOTOPES
SECOND-CLASS CURRENTS
SECONDS LIVING RADIOISOTOPES
STABLE ISOTOPES
WEAK INTERACTIONS
WEAK PARTICLE DECAY
ZEEMAN EFFECT