Level Structures of ${}^{56,58}$Ca Cast Doubt on a doubly magic ${}^{60}$Ca

S. Chen, F. Browne, P. Doornenbal +80

Gamma decays were observed in ${}^{56}$Ca and ${}^{58}$Ca following quasi-free one-proton knockout reactions from ${}^{57,59}$Sc beams at $\approx 200$ MeV/nucleon. For ${}^{56}$Ca, a $\gamma$…