Half-lives $T_{ 1/2}^{ 2\nu}$ for two neutrino positron double beta decay modes $\beta^{ +}$EC/ECEC are calculated for $^{ 74}$Se, a nucleus of current experimental interest, using deformed shell model based on Hartree-Fock states employing a modified Kuo interaction in ($^{ 2}p_{ 3/2}$, $^{ 1}f_{ 5/2}$, $^{ 2}p_{ 1/2}$, $^{ 1}g_{ 9/2}$) space. The calculated half-life for the ECEC mode is $\sim 10^{ 26}$yr and it may be possible to observe this in the near future with improved sensitivity of experiments.
Categories: nucl-th