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Grocutt, L.; Chapman, R.; Bouhelal, M.; Haas, F.; Goasduff, A.; Smith, J. F.; Lubna, R. S.; Courtin, S.; Bazzacco, D.; Braunroth, T.; Capponi, L.; Corradi, L.; Derkx, X.; Desesquelles, P.; Doncel, M.; Fioretto, E.; Gottardo, A.; Liberati, V.; Melon, B.; Mengoni, D.; Michelagnoli, C.; Mijatović, T.; Modamio, V.; Montagnoli, G.; Montanari, D.; Mulholland, K. F.; Napoli, D. R.; Petrache, C. M.; Pipidis, A.; Recchia, F.; Sahin, E.; Singh, P. P.; Stefanini, A. M.; Szilner, S.; Valiente-Dobón, J. J.
Physical review. C, 08/2022, Volume: 106, Issue: 2Journal Article
Lifetimes or lifetime limits of a small number of excited states of the sulfur isotopes with mass numbers A=35, 36, 37, and 38 have been measured using the differential recoil-distance method. The isotopes of sulfur were populated in binary grazing reactions initiated by a beam of 36S ions of energy 225 MeV incident on a thin 208Pb target which was mounted in the Cologne plunger apparatus. The combination of the PRISMA magnetic spectrometer and an early implementation of the AGATA γ-ray tracking array was used to detect γ rays in coincidence with projectile-like nuclear species. Lifetime measurements of populated states were measured within the range from about 1 to 100 ps. The number of states for which lifetime measurements or lifetime limits were possible was limited by statistics. For 35S, the lifetime was determined for the first 1/2+ state at 1572 keV; the result is compared with a previous published lifetime value. The lifetime of the 3− state of 36S at 4193 keV was determined and compared with earlier measurements. No previous lifetime information exists for the (6+) state at 6690 keV; a lifetime measurement with large associated error was made in the present work. For 37S, the states for which lifetime limits were established were those at 646 keV with Jπ=3/2− and at 2776 keV with Jπ=11/2−; there are no previously published lifetime values for excited states of 37S. Finally, a lifetime limit was established for the Jπ=(6+) state of 38S at 3675 keV; no lifetime information exists for this state in the literature. Measured lifetime values were compared with the results of state-of-the-art shell-model calculations based on the PSDPF, SDPF-U, and FSU effective interactions. In addition, nuclear magnetic-dipole and electric-quadrupole moments, branching ratios, mixing ratios, and electromagnetic transition rates, where available, have been compared with shell-model values. The current work suffers from poor statistics; nevertheless, lifetime values and limits have been possible, allowing a useful discussion of the ability of state-of-the-art shell-model calculations to reproduce the experimental results.
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