Lifetime measurements of states of $^{35}\mathrm{S}$, $^{36}\mathrm{S}$, $^{37}\mathrm{S}$, and $^{38}\mathrm{S}$ using the AGATA $\gamma$-ray tracking spectrometer - IN2P3 - Institut national de physique nucléaire et de physique des particules Accéder directement au contenu
Article Dans Une Revue Phys.Rev.C Année : 2022

Lifetime measurements of states of $^{35}\mathrm{S}$, $^{36}\mathrm{S}$, $^{37}\mathrm{S}$, and $^{38}\mathrm{S}$ using the AGATA $\gamma$-ray tracking spectrometer

L. Grocutt
  • Fonction : Auteur
R. Chapman
  • Fonction : Auteur
M. Bouhelal
  • Fonction : Auteur
A. Goasduff
  • Fonction : Auteur
J.F. Smith
  • Fonction : Auteur
R.S. Lubna
  • Fonction : Auteur
D. Bazzacco
  • Fonction : Auteur
T. Braunroth
  • Fonction : Auteur
L. Capponi
  • Fonction : Auteur
L. Corradi
  • Fonction : Auteur
X. Derkx
  • Fonction : Auteur
M. Doncel
  • Fonction : Auteur
E. Fioretto
  • Fonction : Auteur
A. Gottardo
  • Fonction : Auteur
V. Liberati
  • Fonction : Auteur
B. Melon
  • Fonction : Auteur
D. Mengoni
  • Fonction : Auteur
T. Mijatović
  • Fonction : Auteur
V. Modamio
  • Fonction : Auteur
G. Montagnoli
  • Fonction : Auteur
D. Montanari
  • Fonction : Auteur
K.F. Mulholland
  • Fonction : Auteur
D.R. Napoli
  • Fonction : Auteur
A. Pipidis
  • Fonction : Auteur
F. Recchia
  • Fonction : Auteur
E. Sahin
  • Fonction : Auteur
P.P. Singh
  • Fonction : Auteur
A.M. Stefanini
  • Fonction : Auteur
S. Szilner
  • Fonction : Auteur
J.J. Valiente-Dobón
  • Fonction : Auteur

Résumé

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.

Dates et versions

hal-03824437 , version 1 (21-10-2022)

Identifiants

Citer

L. Grocutt, R. Chapman, M. Bouhelal, F. Haas, A. Goasduff, et al.. Lifetime measurements of states of $^{35}\mathrm{S}$, $^{36}\mathrm{S}$, $^{37}\mathrm{S}$, and $^{38}\mathrm{S}$ using the AGATA $\gamma$-ray tracking spectrometer. Phys.Rev.C, 2022, 106 (2), pp.024314. ⟨10.1103/PhysRevC.106.024314⟩. ⟨hal-03824437⟩
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