Test of the conserved vector current hypothesis by a β-ray angular distribution measurement in the mass-8 system

T. Sumikama, K. Matsuta, T. Nagatomo, M. Ogura, T. Iwakoshi, Y. Nakashima, H. Fujiwara, M. Fukuda, M. Mihara, K. Minamisono, T. Yamaguchi, T. Minamisono

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Abstract

The β-ray angular correlations for the spin alignments of Li8 and B8 have been observed in order to test the conserved vector current (CVC) hypothesis. The alignment correlation terms were combined with the known β-α angular correlation terms to determine all the matrix elements contributing to the correlation terms. The weak magnetism term, 7.5±0.2, deduced from the β-ray correlation terms was consistent with the CVC prediction 7.3±0.2, deduced from the analog-γ decay measurement based on the CVC hypothesis. However, there was no consistent CVC prediction for the second-forbidden term associated with the weak vector current. The experimental value for the second-forbidden term was 1.0±0.3, while the CVC prediction was 0.1±0.4 or 2.1±0.5.

Original languageEnglish
Article number065501
JournalPhysical Review C - Nuclear Physics
Volume83
Issue number6
DOIs
Publication statusPublished - 2011 Jun 15

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Sumikama, T., Matsuta, K., Nagatomo, T., Ogura, M., Iwakoshi, T., Nakashima, Y., Fujiwara, H., Fukuda, M., Mihara, M., Minamisono, K., Yamaguchi, T., & Minamisono, T. (2011). Test of the conserved vector current hypothesis by a β-ray angular distribution measurement in the mass-8 system. Physical Review C - Nuclear Physics, 83(6), [065501]. https://doi.org/10.1103/PhysRevC.83.065501