Electromagnetic transitions in neutron-richCl40

In-beam γ-rays from excited states of the neutron-rich ($T_z$=3) nucleus ${}_{}{}^{40}{}_{}{}^{}\mathrm{Cl}$ have been identified in a threefold coincidence experiment in which γ rays and light charged particles were observed. The resulting decay scheme is presented, and implications for the structure of low-lying levels in ${}_{}{}^{40}{}_{}{}^{}\mathrm{Cl}$ are discussed in light of recent data from charge-exchange and β-decay work. The ordering of levels would seem to be quite different from the predictions of recent shell-model calculations.