Is the First ExcitedO+State inCa44of 6p-2h Character?

Abstract

The ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}({}_{}{}^6{}_{}{}^{}\mathrm{Li},d)$ reaction has been used to investigate the structure of the low-lying states of ${}_{}{}^{44}{}_{}{}^{}\mathrm{Ca}$. Cross sections are small (a few μb/sr) but angular-distribution shapes are consistent with a direct process. The results suggest considerable mixing between low-lying fourparticle and six-particle-two-hole states in ${}_{}{}^{44}{}_{}{}^{}\mathrm{Ca}$.