Parity Mixed Doublets in A = 36 Nuclei

Abstract

The $γ$-circular polarizations ($P_γ$) and asymmetries ($A_γ$) of the parity forbidden M1 + E2 $γ$-decays: $^{36}Cl^{\ast} (J^π = 2^{-}; T = 1; E_{x} = 1.95 $ MeV) $\rightarrow$ $^{36}Cl (J^π = 2^{+}; T = 1; g.s.)$ and $^{36}Ar^{\ast} (J^π = 2^{-}; T = 0; E_{x} = 4.97 $ MeV) $\rightarrow$ $^{36}Ar^{\ast} (J^π = 2^{+}; T = 0; E_{x} = 1.97 $ MeV) are investigated theoretically. We use the recently proposed Warburton-Becker-Brown shell-model interaction. For the weak forces we discuss comparatively different weak interaction models based on different assumptions for evaluating the weak meson-hadron coupling constants. The results determine a range of $P_γ$ values from which we find the most probable values: $P_γ$ = $1.1 \cdot 10^{-4}$ for $^{36}Cl$ and $P_γ$ = $3.5 \cdot 10^{-4}$ for $^{36}Ar$.