Excited states of the neutron-rich N = 21 37 S nucleus have been studied using binary grazing reactions produced by the interaction of a 215-MeV beam of 36 S ions with a thin 208 Pb target. The magnetic spectrometer, PRISMA, and the γ -ray array, CLARA, were used in the measurements. The level scheme of 37 S was established to an excitation energy of 4196 keV and a number of new transitions were observed, in particular that corresponding to the decay of the proposed J π = (11/2 − ) level at an excitation energy of 2776 keV. The structure of the state is discussed within the context of state-of-the-art shell-model calculations using the SDPF-U effective interaction; the main component of the wave function corresponds to the coupling of the odd 1f 7/2 neutron to the first 2 + state of the 36 S core. The electromagnetic decay properties of the state are discussed within the context of a particle-core coupling model and the shell model. The other members of the multiplet of states are also discussed.
The neutron-rich 39 S nucleus has been studied using binary grazing reactions produced by the interaction of a 215-MeV beam of 36 S ions with a thin 208 Pb target. The magnetic spectrometer, PRISMA, and the γ -ray array, CLARA, were used in the measurements. Gamma-ray transitions of the following energies were observed: 339, 398, 466, 705, 1517, 1656, and 1724 keV. Five of the observed transitions have been tentatively assigned to the decay of excited states with spins up to (11/2 − ). The results of a state-of-the-art shell-model calculation of the level scheme of 39 S using the SDPF-U effective interaction are also presented. The systematic behavior of the excitation energy of the first 11/2 − states in the odd-A isotopes of sulfur and argon is discussed in relation to the excitation energy of the first excited 2 + states of the adjacent even-A isotopes. The states of 39 S that have the components in their wave functions corresponding to three neutrons in the 1f 7/2 orbital outside the N = 20 core have also been discussed within the context of the 0 ω shell-model calculations presented here.
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