Abstract
The decays of the three isomers of $^{131}\mathrm{In}$ and the total decay energies of the two isomers of $^{131}\mathrm{Sn}$ have been studied in high sensitivity experiments at the OSIRIS mass separator. The main purpose of the investigation was to determine the position of the neutron hole ${h}_{11∕2}$ state, since a previous determination appeared to be in error. The present results support a small separation of the ${d}_{3∕2}$ and ${h}_{11∕2}$ neutron hole states. The new value obtained from measurements of decay energies is $69\ifmmode\pm\else\textpm\fi{}14\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$. A more precise value of $65.1\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$ may be deduced from the level scheme of $^{131}\mathrm{Sn}$ obtained currently, however without firm support from coincidence data. This relatively low excitation energy of the ${h}_{11∕2}$ state is in agreement with systematics and in disagreement with the previous determination. A re-evaluation of the ${Q}_{\ensuremath{\beta}}$ values and isomer spacings of $^{131}\mathrm{In}$ has been made.
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