Formulation of a shell–cluster overlap integral with the Gaussian expansion method

Abstract We formulate a computational method to evaluate the overlap integral of shell-model and cluster-model wave functions. The framework is applied system core plus two neutrons, magnitude configuration (core + $n$ $n$) di-neutron cluster one $2n$) explored. have found that prominently enhanced when neutrons occupy orbits with low orbital angular momenta, such as $s$- $p$-wave orbits. shell–cluster calculated in systems $jj$-closed cores enhancement due occupation $s$ or $p$ orbit also occurs systematic calculation. effect interaction on integrals discussed.