Total Gamow-Teller strength and effect of configuration mixing and proton-neutron correlation in the even-evensd-shell nuclei

We have calculated the total Gamow-Teller strength $S_{\pm }$ in the even-even sd-shell nuclei making use of the sum rule technique. The ground state wave function is obtained from the shell model calculation in the full (sd${)}^n$ space. It is shown that the proton-neutron correlation effect causes a considerable amount of reduction of the total Gamow-Teller strength. It is also shown that the reduction of the isospin component in $S_{\mathrm{-}}$ induced by the configuration mixing becomes more significant with increasing isospin.