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

R. Chapman, Z. M. Wang, M. Bouhelal, F. Haas, X. Liang, F. Azaiez, B. R. Behera, M. Burns, E. Caurier, L. Corradi, D. Curien, A. N. Deacon, Zs. Dombradi, E. Farnea, E. Fioretto, A. Gadea, A. Hodsdon, F. Ibrahim, A. Jungclaus, K. KeyesV. Kumar, S. Lunardi, N. Marginean, G. Montagnoli, D. R. Napoli, F. Nowacki, J. Ollier, D. O'Donnell, A. Papenberg, G. Pollarolo, M. -D. Salsac, F. Scarlassara, J. F. Smith, Klaus Spohr, M. Stanoiu, A. M. Stefanini, S. Szilner, M. Trotta, D. Verney

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The neutron-rich 39S nucleus has been studied using binary grazing reactions produced by the interaction of a 215-MeV beam of 36S ions with a thin 208Pb 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 39S 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 39S 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.
Original languageEnglish
Article number024325
JournalPhysical Review C
Issue number2
Publication statusPublished - 17 Aug 2016


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