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

Publisher Website

16 June 1975

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

Vol. 34 (24) , 1533-1537
https://doi.org/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

This publication has 11 references indexed in Scilit:

Recoil effects in allowed beta decay: The elementary particle approach
Reviews of Modern Physics, 1974
Limits to second-class currents
Physics Letters B, 1974
The second-class current problem in nuclear beta decay
Nuclear Physics B, 1973
Radiative Corrections to Asymmetry and Energy Spectrum of β Rays from Polarized Nuclei
Progress of Theoretical Physics, 1973
?-Rays Emitted from the Polarized Nuclei and ?-Decay Interactions on the Strong Meson-Dominance Model
Progress of Theoretical Physics, 1972
Mirror asymmetry, meson exchanges and second class currents
Nuclear Physics B, 1971
Quadrupole Effects in NMR Spectra on Short-Lived β-Radioactive Nuclei, ¹²B and ¹²N
Journal of the Physics Society Japan, 1971
Magnetic Moments of Short-Lived β-Radioactive Nuclei, ¹²B and ¹²N
Journal of the Physics Society Japan, 1968
The Universal Fermi Interaction and the Conserved Vector Current in Beta Decay
Reviews of Modern Physics, 1964
Charge Symmetry of Weak Interactions
Physical Review B, 1958