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

Autori
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, Tea ; 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, Suzana ; Valiente-Dobon, J. J.

Izvornik
Physical review. C (2469-9985) 106 (2022), 2; 024314, 17

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
nuclear structure ; lifetimes ; shell model

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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