TY - JOUR
T1 - Proton single-particle states in the neutron-rich 23F nucleus
AU - Michimasa, S.
AU - Shimoura, S.
AU - Iwasaki, H.
AU - Tamaki, M.
AU - Ota, S.
AU - Aoi, N.
AU - Baba, H.
AU - Iwasa, N.
AU - Kanno, S.
AU - Kubono, S.
AU - Kurita, K.
AU - Kurokawa, M.
AU - Minemura, T.
AU - Motobayashi, T.
AU - Notani, M.
AU - Ong, H. J.
AU - Saito, A.
AU - Sakurai, H.
AU - Takeshita, E.
AU - Takeuchi, S.
AU - Yanagisawa, Y.
AU - Yoshida, A.
N1 - Funding Information:
The authors thank the RIKEN Ring Cyclotron staff for cooperation during the experiment. They wish to acknowledge helpful discussions with T. Otsuka and Y. Utsuno. One of the authors (S.M.) is grateful for financial assistance from the Special Postdoctoral Researcher Program of RIKEN. The present work was partially supported by a Grant-In-Aid for Scientific Research from the Japan Ministry of Education, Culture, Sports, Science and Technology under program number (A) 15204018.
PY - 2006/7/6
Y1 - 2006/7/6
N2 - 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.
AB - 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.
KW - α-induced stripping reactions
KW - γ-ray spectroscopy
KW - Single-particle states
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U2 - 10.1016/j.physletb.2006.05.035
DO - 10.1016/j.physletb.2006.05.035
M3 - Article
AN - SCOPUS:33745087431
SN - 0370-2693
VL - 638
SP - 146
EP - 152
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 2-3
ER -