The $\gamma$-circular polarizations ($P_{ \gamma}$) and asymmetries ($A_{ \gamma}$) of the parity forbidden M1 + E2 $\gamma$-decays: $^{ 36}Cl^{ \ast} (J^{ \pi} = 2^{ -}; T = 1; E_{ x} = 1.95 $ MeV) $\rightarrow$ $^{ 36}Cl (J^{ \pi} = 2^{ +}; T = 1; g.s.)$ and $^{ 36}Ar^{ \ast} (J^{ \pi} = 2^{ -}; T = 0; E_{ x} = 4.97 $ MeV) $\rightarrow$ $^{ 36}Ar^{ \ast} (J^{ \pi} = 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 $P_{ \gamma}$ values from which we find the most probable values: $P_{ \gamma}$ = $1.1 \cdot 10^{ -4}$ for $^{ 36}Cl$ and $P_{ \gamma}$ = $3.5 \cdot 10^{ -4}$ for $^{ 36}Ar$.
Categories: nucl-th