Lifetime measurements of states of 35S, 36S 37S, and 38S using the AGATA γ -ray tracking spectrometer

L. Grocutt, R. Chapman*, M. Bouhelal, F. Haas, A. Goasduff, J. F. Smith, R. S. Lubna, S. Courtin, D. Bazzacco, T. Braunroth, L. Capponi, L. Corradi, X. Derkx, P. Desesquelles, M. Doncel, E. Fioretto, A. Gottardo, V. Liberati, B. Melon, D. MengoniC. Michelagnoli, T. Mijatović, V. Modamio, G. Montagnoli, D. Montanari, K. F. Mulholland, D. R. Napoli, C. M. Petrache, A. Pipidis, F. Recchia, E. Sahin, P. P. Singh, A. M. Stefanini, S. Szilner, J. J. Valiente-Dobón

*Corresponding author for this work

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Abstract

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 S36 ions of energy 225 MeV incident on a thin Pb208 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 S35, 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 S36 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 S37, 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 S37. Finally, a lifetime limit was established for the Jπ=(6+) state of S38 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.

Original languageEnglish
Article number024314
JournalPhysical Review C
Volume106
Issue number2
DOIs
Publication statusPublished - 16 Aug 2022

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