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

Research output: Contribution to journalArticlepeer-review

  • Authors:
  • R. Chapman
  • Z. M. Wang
  • M. Bouhelal
  • F. Haas
  • X. Liang
  • And 34 others
  • External authors:
  • F. Azaiez
  • B. R. Behera
  • M. Burns
  • E. Caurier
  • L. Corradi
  • D. Curien
  • A. N. Deacon
  • Zs Dombrádi
  • E. Farnea
  • E. Fioretto
  • A. Gadea
  • A. Hodsdon
  • F. Ibrahim
  • A. Jungclaus
  • K. Keyes
  • V. Kumar
  • S. Lunardi
  • N. MǍrginean
  • G. Montagnoli
  • D. R. Napoli
  • F. Nowacki
  • J. Ollier
  • D. O'Donnell
  • A. Papenberg
  • G. Pollarolo
  • M. D. Salsac
  • F. Scarlassara
  • J. F. Smith
  • K. M. Spohr
  • M. Stanoiu
  • A. M. Stefanini
  • S. Szilner
  • M. Trotta
  • D. Verney


The neutron-rich S39 nucleus has been studied using binary grazing reactions produced by the interaction of a 215-MeV beam of S36 ions with a thin Pb208 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 S39 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 S39 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 ω shell-model calculations presented here.

Bibliographical metadata

Original languageEnglish
Article number024325
JournalPhysical Review C - Nuclear Physics
Issue number2
Publication statusPublished - 17 Aug 2016