Abstract
The decay of $^{156}\mathrm{Pm}$ has been studied resulting in the first detailed information on the excited states of $^{156}\mathrm{Sm}$. About 25 levels were found, of which two were \ensuremath{\gamma}-decaying isomers. The expected low-lying quadrupole vibrational levels could not be identified. The observed decay rates for \ensuremath{\beta} and \ensuremath{\gamma} transitions have enabled the classification of some levels, including the \ensuremath{\beta}-decaying ground state of $^{156}\mathrm{Pm}$, in terms of specific two-quasiparticle states. The total beta-decay energy of $^{156}\mathrm{Pm}$ was obtained as 5.155(35) MeV.
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