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. Orr; H. 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

doi:10.1103/PhysRevLett.103.262501

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

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Abstract

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 language	English
Article number	262501
Journal	Physical review letters
Volume	103
Issue number	26
DOIs	https://doi.org/10.1103/PhysRevLett.103.262501
Publication status	Published - 2009
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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Nakamura, T., Kobayashi, N., Kondo, Y., Satou, Y., Aoi, N., Baba, H., Deguchi, S., Fukuda, N., Gibelin, J., Inabe, N., Ishihara, M., Kameda, D., Kawada, Y., Kubo, T., Kusaka, K., Mengoni, A., Motobayashi, T., Ohnishi, T., Ohtake, M., ... Yoshida, K. (2009). Halo structure of the island of inversion nucleus Ne31. Physical review letters, 103(26), [262501]. https://doi.org/10.1103/PhysRevLett.103.262501

Nakamura, T, Kobayashi, N, Kondo, Y, Satou, Y, Aoi, N, Baba, H, Deguchi, S, Fukuda, N, Gibelin, J, Inabe, N, Ishihara, M, Kameda, D, Kawada, Y, Kubo, T, Kusaka, K, Mengoni, A, Motobayashi, T, Ohnishi, T, Ohtake, M, Orr, NA, Otsu, H, Otsuka, T, Saito, A, Sakurai, H, Shimoura, S, Sumikama, T, Takeda, H, Takeshita, E, Takechi, M, Takeuchi, S, Tanaka, K, Tanaka, KN, Tanaka, N, Togano, Y, Utsuno, Y, Yoneda, K, Yoshida, A & Yoshida, K 2009, 'Halo structure of the island of inversion nucleus Ne31', Physical review letters, vol. 103, no. 26, 262501. https://doi.org/10.1103/PhysRevLett.103.262501

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title = "Halo structure of the island of inversion nucleus Ne31",

abstract = "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.",

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

year = "2009",

doi = "10.1103/PhysRevLett.103.262501",

language = "English",

volume = "103",

journal = "Physical Review Letters",

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AU - Nakamura, T.

AU - Kobayashi, N.

AU - Kondo, Y.

AU - Satou, Y.

AU - Aoi, N.

AU - Baba, H.

AU - Deguchi, S.

AU - Fukuda, N.

AU - Gibelin, J.

AU - Inabe, N.

AU - Ishihara, M.

AU - Kameda, D.

AU - Kawada, Y.

AU - Kubo, T.

AU - Kusaka, K.

AU - Mengoni, A.

AU - Motobayashi, T.

AU - Ohnishi, T.

AU - Ohtake, M.

AU - Orr, N. A.

AU - Otsu, H.

AU - Otsuka, T.

AU - Saito, A.

AU - Sakurai, H.

AU - Shimoura, S.

AU - Sumikama, T.

AU - Takeda, H.

AU - Takeshita, E.

AU - Takechi, M.

AU - Takeuchi, S.

AU - Tanaka, K.

AU - Tanaka, K. N.

AU - Tanaka, N.

AU - Togano, Y.

AU - Utsuno, Y.

AU - Yoneda, K.

AU - Yoshida, A.

AU - Yoshida, K.

PY - 2009

Y1 - 2009

N2 - 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.

AB - 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.

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Halo structure of the island of inversion nucleus Ne31

Abstract

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