Experimental Study of Weak Magnetism and Second-Class Interaction Effects in the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>β</mi></math></span> Decay of Polarized <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Ne</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>19</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

F. P. Calaprice; S. J. Freedman; W. C. Mead; H. C. Vantine

doi:10.1103/PhysRevLett.35.1566

Experimental Study of Weak Magnetism and Second-Class Interaction Effects in the $β$ Decay of Polarized ${}^{19}{Ne}$

F. P. Calaprice, S. J. Freedman, W. C. Mead, and H. C. Vantine

Phys. Rev. Lett. 35, 1566 – Published 8 December 1975

Abstract

The angular distribution of positrons emitted in the decay of polarized ${}^{19}{Ne}$ has been measured as a test for the second-class weak interaction. The $β$ asymmetry parameter varies linearly with the $β$ energy with slope ${(\frac{dA}{dE})}_{\exp} = (- 0.65 \pm 0.15) %$ Me $V^{- 1}$ . This result requires a second-class form factor comparable to the weak-magnetism term.