$β$ -Decay Asymmetries in Polarized ${}^{12}B$ and ${}^{12}N$ and the $G$ -Parity-Nonconserving Weak Interaction

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16 June 1975

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 34 (24) , 1533-1537
DOI:10.1103/physrevlett.34.1533

Abstract

The decay asymmetries (

a

) in polarized

{}^{12}B

and

{}^{12}N

have been measured as a function of

β

-ray energy (

E

). The coefficients

α_{\mp}

, in a form of

a = \mp P (\frac{p}{E}) (1 + α_{\mp} E)

, have been determined to be

α_{-} ({}^{12}B) = + (0.31 \pm 0.06) % / MeV

and

α_{+} ({}^{12}N) = - (0.21 \pm 0.07) % / MeV

. The experimental value,

α_{-} - α_{+} = (0.52 \pm 0.09) % / MeV

. is larger than the prediction of conserved-vector-current theory,

{(α_{-} - α_{+})}_{CVC} ≃ 0.27 % / MeV

, and in favor of the existence of the second-class induced-tensor current.

Keywords

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