Proton Shell Structure in Neutron-rich 23F

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

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8 Citations (Scopus)


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. The excited states were identified by de-excitation γ-rays coincident with outgoing 23F, and we found the proton single-particle states at 2268 and 4059 keV by comparison of the population strengths among these reactions. These states were respectively assigned to have ℓ = 0 and ℓ = 2 by the angular distributions obtained in the transfer reaction, and therefore they were considered to have the configurations of π s1 / 2 and π d3 / 2. The excitation energies of these states are located at higher excitation energies than the shell model predictions for the USD and SDPF-M interactions, which may indicate that the centroid energy gaps between π d5 / 2 and π s1 / 2 are wider than predictions.

Original languageEnglish
Pages (from-to)569-574
Number of pages6
JournalNuclear Physics A
Issue number1-4 SPEC. ISS.
Publication statusPublished - 2007 May 1

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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