CaltechAUTHORS: Article
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A Caltech Library Repository Feedhttp://www.rssboard.org/rss-specificationpython-feedgenenTue, 23 Apr 2024 19:42:44 -0700Comparison of the β-α Angular Correlations in Li8 and B8
https://resolver.caltech.edu/CaltechAUTHORS:NORprl60b
Year: 1960
DOI: 10.1103/PhysRevLett.5.321
Although the radiations following allowed β decay of unoriented nuclei are uncorrelated in angle with the β rays, forbidden effects may produce correlations of the form 1 + B cos^2 θ, where the small coefficient B depends on on the details of the matrix elements involved. As a possible test of the conserved vector current (C.V.C.) theory, various authors [2,3] have suggested a measurement of the difference, δ, of the B coefficients in the β-α correlations of the two decays: .....https://resolver.caltech.edu/CaltechAUTHORS:NORprl60bComparison of the beta-alpha angular correlations in the Li8 and B8 beta decays, and the conserved vector current theory
https://resolver.caltech.edu/CaltechAUTHORS:NORpr62
Year: 1962
DOI: 10.1103/PhysRev.125.321
This paper describes a comparison of the beta-alpha angular correlations of the beta decays of Li8 and B8 to the 2.90-Mev alpha-unstable level of Be8. The data were fitted to an angular correlation in the laboratory system of the form W(θβα)=1+Acosθβα+Bcos2θβα, where A and B were independently determined for the Li8 and B8 beta decays from measurements at θβα=0°, 90°, and 180°. The coefficients A are due to the recoil of Be8* and have the same sign for both beta decays. The coefficients B arise from the interference of forbidden vector matrix elements with the allowed axial vector matrix element and have different signs in the two decays. The correlation for the Li8 decay was measured with average total beta energies, Wβ~5, 8, and 11 Mev. Both A and B were found to be approximately linear in Wβ. The correlation for the B8 decay was measured only with average Wβ~11 Mev. From the data with Wβ~11 Mev, the difference of the coefficients, B(Li8)-B(B8), equals (0.0070±0.0012)Wβ. This result is compared with theoretical predictions based on the older Fermi and the newer conserved vector current theories of beta decay. The experiment agrees with the prediction of the latter theory.https://resolver.caltech.edu/CaltechAUTHORS:NORpr62Search for Neutral-Weak-Current Effects in the Nucleus 18F
https://resolver.caltech.edu/CaltechAUTHORS:BARprl78
Year: 1978
DOI: 10.1103/PhysRevLett.40.840
The circular polarization of the γ rays from the 1.08→0.0 MeV transition of 18F has been measured to be (-0.7 ± 2.0) × 10^-3, a value significantly smaller than predicted by recent calculations which include the effects of neutral weak currents.https://resolver.caltech.edu/CaltechAUTHORS:BARprl78