Elsevier

Physics Letters B

Volume 70, Issue 1, 12 September 1977, Pages 23-26
Physics Letters B

Search for second-class current: The measurement of the β-γ directional correlation in the decay of 20Na

https://doi.org/10.1016/0370-2693(77)90335-5Get rights and content

Abstract

The β(E0 = 11.76 MeV) − γ(1.63 MeV) directional correlation has been measured as a function of the β-energy in the decay of 20Na. Denoting the correlation function by W+(θ) = 1 + α+(E) cos2θ, our result can be expressed phenomenologically as α+(E) = [(−4.0 ± 0.7) × 10−3 E + (1.3 ± 0.9) × 10−4 E2] (p/E)2, where E is the positron total energy in MeV and p its momentum in MeV/c. Assuming the correctness of nuclear structure calculations and the validity of the conserved vector current theory, it indicates the presence of a second-class current in the nuclear weak interaction.

References (11)

  • D.H. Wilkinson

    Phys. Lett.

    (1974)
  • H. Genz et al.

    Nucl. Phys.

    (1976)
  • P.D. Ingalls

    Nucl. Phys.

    (1976)
  • S. Weinberg

    Phys. Rev.

    (1958)
  • J. Delorme et al.

    Nucl. Phys.

    (1971)
There are more references available in the full text version of this article.

Cited by (0)

1

In partial fulfilment of the requirements of a Ph.D. degree.

View full text