Beta-Decay Asymmetry and Nuclear Magnetic Moment of Argon-35

The asymmetry in beta emission from polarized ${\mathrm{Ar}}^{35}$ nuclei and the nuclear magnetic moment of ${\mathrm{Ar}}^{35}$ have been determined by an atomic-beam method used previously for similar measurements on ${\mathrm{Ne}}^{19}$. The results are: for the asymmetry parameter, $A=+0.16\mathrm{}\pm 0.04$; and for the nuclear moment, $\mu =+0.632\mathrm{}\pm 0.002$ nm. The experimental value of $A$ is used to obtain the Gamow-Teller beta-decay matrix element: $〈\sigma 〉=0.10\mathrm{}\pm 0.05$. This result is consistent with the measured $\mathrm{ft}$ value and electron-neutrino angular correlation coefficient in the decay of ${\mathrm{Ar}}^{35}$. The results are also consistent with a rotational model of ${\mathrm{Ar}}^{35}$ using a deformation parameter close to that of ${\mathrm{Cl}}^{35}$.