Proton single-particle states in the neutron-rich 23F nucleus

S. Michimasa, S. Shimoura, H. Iwasaki, M. Tamaki, S. Ota, N. Aoi, H. Baba, N. Iwasa, S. Kanno, S. Kubono, K. Kurita, M. Kurokawa, T. Minemura, T. Motobayashi, M. Notani, H. J. Ong, A. Saito, H. Sakurai, E. Takeshita, S. TakeuchiY. Yanagisawa, A. Yoshida

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

The proton shell structure in neutron-rich fluorine 23F was investigated using the in-beam γ-ray spectroscopy technique via the proton transfer reaction onto the 22O nucleus. We also measured the α inelastic scattering on 23F, the neutron knockout from 24F, and the two-nucleon knockout from 25Ne using a cocktail secondary beam. By comparison of the population strengths for excited states in these reactions, we deduced the character of the excited states. The levels and γ-decay scheme in 23F were proposed based on de-excitation γ-rays and the products of these reactions. We found that the 2268- and 4059-keV levels have strong proton single-particle nature of the s1 / 2 and d3 / 2 orbitals, respectively, by analysis of the population strengths and the angular distributions of the states. These single-particle states are located at higher excitation energies than the shell model predictions for the USD and SDPF-M interactions, which indicates that the centroid energy gaps for π d5 / 2 - π s1 / 2 and π d5 / 2 - π d3 / 2 are wider than predicted.

Original languageEnglish
Pages (from-to)146-152
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume638
Issue number2-3
DOIs
Publication statusPublished - 2006 Jul 6

Keywords

  • Single-particle states
  • α-induced stripping reactions
  • γ-ray spectroscopy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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