First in-beam γ -ray study of the level structure of neutron-rich 39S

Abstract : The neutron-rich S39 nucleus has been studied using binary grazing reactions produced by the interaction of a 215-MeV beam of S36 ions with a thin Pb208 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 S39 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 S39 that have the components in their wave functions corresponding to three neutrons in the 1f7/2 orbital outside the N=20 core have also been discussed within the context of the 0 ℏω shell-model calculations presented here.
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Submitted on : Wednesday, December 7, 2016 - 3:10:51 PM
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R. Chapman, M. Wang, M. Bouhelal, F. Haas, X. Liang, et al.. First in-beam γ -ray study of the level structure of neutron-rich 39S. Physical Review C, American Physical Society, 2016, 94 (2), pp.024325. ⟨10.1103/PhysRevC.94.024325⟩. ⟨in2p3-01411501⟩

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