Halo structure of the island of inversion nucleus Ne31

T. Nakamura, N. Kobayashi, Y. Kondo, Y. Satou, N. Aoi, H. Baba, S. Deguchi, N. Fukuda, J. Gibelin, N. Inabe, M. Ishihara, D. Kameda, Y. Kawada, T. Kubo, K. Kusaka, A. Mengoni, T. Motobayashi, T. Ohnishi, M. Ohtake, N. A. OrrH. Otsu, T. Otsuka, A. Saito, H. Sakurai, S. Shimoura, T. Sumikama, H. Takeda, E. Takeshita, M. Takechi, S. Takeuchi, K. Tanaka, K. N. Tanaka, N. Tanaka, Y. Togano, Y. Utsuno, K. Yoneda, A. Yoshida, K. Yoshida

Research output: Contribution to journalArticlepeer-review

189 Citations (Scopus)


The cross sections for single-neutron removal from the very neutron-rich nucleus Ne31 on Pb and C targets have been measured at 230MeV/nucleon using the RIBF facility at RIKEN. The deduced large Coulomb breakup cross section of 540(70) mb is indicative of a soft E1 excitation. Comparison with direct-breakup model calculations suggests that the valence neutron of Ne31 occupies a low-ρ orbital (most probably 2p3/2) with a small separation energy (Sn□0.8MeV), instead of being predominantly in the 1f7/2 orbital as expected from the conventional shell ordering. These findings suggest that Ne31 is the heaviest halo system known.

Original languageEnglish
Article number262501
JournalPhysical review letters
Issue number26
Publication statusPublished - 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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