Search for neutron decoupling in O22 via the (d,d'γ) reaction

Z. Elekes, Zs Dombrádi, N. Aoi, S. Bishop, Zs Fülöp, J. Gibelin, T. Gomi, Y. Hashimoto, N. Imai, N. Iwasa, H. Iwasaki, G. Kalinka, Y. Kondo, A. A. Korsheninnikov, K. Kurita, M. Kurokawa, N. Matsui, T. Motobayashi, T. Nakamura, T. NakaoE. Yu Nikolskii, T. K. Ohnishi, T. Okumura, S. Ota, A. Perera, A. Saito, H. Sakurai, Y. Satou, D. Sohler, T. Sumikama, D. Suzuki, M. Suzuki, H. Takeda, S. Takeuchi, Y. Togano, Y. Yanagisawa

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


We have searched for valence neutron decoupling in O22, a phenomenon recently observed in neutron-rich C, B, and lighter O nuclei. From the cross section of the (d,d'γ) reaction for the transition between the ground state and the first 2+ state of O22, the neutron and proton deformation parameters have been deduced by distorted wave analysis using and reanalyzing the data of a previous Coulomb excitation measurement. The ratio of the neutron and proton multipole transition matrix elements Mn/Mp compared to the N/Z value has been derived to be around 1. This result indicates that the O22 isotope has small and similar neutron and proton deformations, which is consistent with N=14 shell closure. Thus, the concept of neutron decoupling does not hold for this nucleus.

Original languageEnglish
Article number017306
JournalPhysical Review C - Nuclear Physics
Issue number1
Publication statusPublished - 2006


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