Abstract
Recent experimental data about the 30P(p, $ \gamma$ ) reaction have been reported, where a list of confirmed 31S excited states within 500 keV of the 30P(p, $ \gamma$ )31S threshold at $ E_{x} = 6131$ keV and their properties were studied. Definitive constraints on $ J^{\pi}$ are only given for two levels; the other ones are either tentative (five states) or undefined (six states). In order to confirm the proposed spin/parity assignments and to determine the unknown ones a comparison with shell-model calculations is crucial. We have performed a shell-model calculation using the $ (0+1)\hbar\omega$ PSDPF interaction to calculate the excitation energy spectrum of mass 31 ( 31S - 31P up to 7000 keV. Between 6100 and 6700 keV, an excitation energy region of astrophysical interest, we obtain a set of negative-parity states that are good candidates for the observed ones. A complete spectrum of positive- and negative-parity states can now be proposed based also on a comparison with the 31P spectrum up to 7000 keV.
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