Vanishing N=20 shell gap: Study of excited states in Ne27,28

Zs. S. Dombrádi, Z. Elekes, A. Saito, N. Aoi, H. Baba, K. Demichi, Zs. S. Fülöp, J. Gibelin, T. Gomi, H. Hasegawa, N. Imai, M. Ishihara, H. Iwasaki, S. Kanno, S. Kawai, T. Kishida, T. Kubo, K. Kurita, Y. Matsuyama, S. MichimasaT. Minemura, T. Motobayashi, M. Notani, T. Ohnishi, H. J. Ong, S. Ota, A. Ozawa, H. K. Sakai, H. Sakurai, S. Shimoura, E. Takeshita, S. Takeuchi, M. Tamaki, Y. Togano, K. Yamada, Y. Yanagisawa, K. Yoneda

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Abstract

This Letter reports on the H1(Ne28,Ne28) and H1(Ne28,Ne27) reactions studied at intermediate energy using a liquid hydrogen target. From the cross section populating the first 2+ excited state of Ne28, and using the previously determined B(E2) value, the neutron quadrupole transition matrix element has been calculated to be Mn=13.8±3.7fm2. In the neutron knockout reaction, two low-lying excited states were populated in Ne27. Only one of them can be interpreted by the sd shell model while the additional state may intrude from the fp shell. These experimental observations are consistent with the presence of fp shell configurations at low excitation energy in Ne27,28 nuclei caused by a vanishing N=20 shell gap at Z=10.

Original languageEnglish
Article number182501
JournalPhysical Review Letters
Volume96
Issue number18
DOIs
Publication statusPublished - 2006

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excitation
neutrons
liquid hydrogen
quadrupoles
nuclei
energy
cross sections
configurations

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Vanishing N=20 shell gap : Study of excited states in Ne27,28. / Dombrádi, Zs. S.; Elekes, Z.; Saito, A.; Aoi, N.; Baba, H.; Demichi, K.; Fülöp, Zs. S.; Gibelin, J.; Gomi, T.; Hasegawa, H.; Imai, N.; Ishihara, M.; Iwasaki, H.; Kanno, S.; Kawai, S.; Kishida, T.; Kubo, T.; Kurita, K.; Matsuyama, Y.; Michimasa, S.; Minemura, T.; Motobayashi, T.; Notani, M.; Ohnishi, T.; Ong, H. J.; Ota, S.; Ozawa, A.; Sakai, H. K.; Sakurai, H.; Shimoura, S.; Takeshita, E.; Takeuchi, S.; Tamaki, M.; Togano, Y.; Yamada, K.; Yanagisawa, Y.; Yoneda, K.

In: Physical Review Letters, Vol. 96, No. 18, 182501, 2006.

Research output: Contribution to journalArticle

Dombrádi, ZS, Elekes, Z, Saito, A, Aoi, N, Baba, H, Demichi, K, Fülöp, ZS, Gibelin, J, Gomi, T, Hasegawa, H, Imai, N, Ishihara, M, Iwasaki, H, Kanno, S, Kawai, S, Kishida, T, Kubo, T, Kurita, K, Matsuyama, Y, Michimasa, S, Minemura, T, Motobayashi, T, Notani, M, Ohnishi, T, Ong, HJ, Ota, S, Ozawa, A, Sakai, HK, Sakurai, H, Shimoura, S, Takeshita, E, Takeuchi, S, Tamaki, M, Togano, Y, Yamada, K, Yanagisawa, Y & Yoneda, K 2006, 'Vanishing N=20 shell gap: Study of excited states in Ne27,28', Physical Review Letters, vol. 96, no. 18, 182501. https://doi.org/10.1103/PhysRevLett.96.182501
Dombrádi, Zs. S. ; Elekes, Z. ; Saito, A. ; Aoi, N. ; Baba, H. ; Demichi, K. ; Fülöp, Zs. S. ; Gibelin, J. ; Gomi, T. ; Hasegawa, H. ; Imai, N. ; Ishihara, M. ; Iwasaki, H. ; Kanno, S. ; Kawai, S. ; Kishida, T. ; Kubo, T. ; Kurita, K. ; Matsuyama, Y. ; Michimasa, S. ; Minemura, T. ; Motobayashi, T. ; Notani, M. ; Ohnishi, T. ; Ong, H. J. ; Ota, S. ; Ozawa, A. ; Sakai, H. K. ; Sakurai, H. ; Shimoura, S. ; Takeshita, E. ; Takeuchi, S. ; Tamaki, M. ; Togano, Y. ; Yamada, K. ; Yanagisawa, Y. ; Yoneda, K. / Vanishing N=20 shell gap : Study of excited states in Ne27,28. In: Physical Review Letters. 2006 ; Vol. 96, No. 18.
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abstract = "This Letter reports on the H1(Ne28,Ne28) and H1(Ne28,Ne27) reactions studied at intermediate energy using a liquid hydrogen target. From the cross section populating the first 2+ excited state of Ne28, and using the previously determined B(E2) value, the neutron quadrupole transition matrix element has been calculated to be Mn=13.8±3.7fm2. In the neutron knockout reaction, two low-lying excited states were populated in Ne27. Only one of them can be interpreted by the sd shell model while the additional state may intrude from the fp shell. These experimental observations are consistent with the presence of fp shell configurations at low excitation energy in Ne27,28 nuclei caused by a vanishing N=20 shell gap at Z=10.",
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AU - Dombrádi, Zs. S.

AU - Elekes, Z.

AU - Saito, A.

AU - Aoi, N.

AU - Baba, H.

AU - Demichi, K.

AU - Fülöp, Zs. S.

AU - Gibelin, J.

AU - Gomi, T.

AU - Hasegawa, H.

AU - Imai, N.

AU - Ishihara, M.

AU - Iwasaki, H.

AU - Kanno, S.

AU - Kawai, S.

AU - Kishida, T.

AU - Kubo, T.

AU - Kurita, K.

AU - Matsuyama, Y.

AU - Michimasa, S.

AU - Minemura, T.

AU - Motobayashi, T.

AU - Notani, M.

AU - Ohnishi, T.

AU - Ong, H. J.

AU - Ota, S.

AU - Ozawa, A.

AU - Sakai, H. K.

AU - Sakurai, H.

AU - Shimoura, S.

AU - Takeshita, E.

AU - Takeuchi, S.

AU - Tamaki, M.

AU - Togano, Y.

AU - Yamada, K.

AU - Yanagisawa, Y.

AU - Yoneda, K.

PY - 2006

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N2 - This Letter reports on the H1(Ne28,Ne28) and H1(Ne28,Ne27) reactions studied at intermediate energy using a liquid hydrogen target. From the cross section populating the first 2+ excited state of Ne28, and using the previously determined B(E2) value, the neutron quadrupole transition matrix element has been calculated to be Mn=13.8±3.7fm2. In the neutron knockout reaction, two low-lying excited states were populated in Ne27. Only one of them can be interpreted by the sd shell model while the additional state may intrude from the fp shell. These experimental observations are consistent with the presence of fp shell configurations at low excitation energy in Ne27,28 nuclei caused by a vanishing N=20 shell gap at Z=10.

AB - This Letter reports on the H1(Ne28,Ne28) and H1(Ne28,Ne27) reactions studied at intermediate energy using a liquid hydrogen target. From the cross section populating the first 2+ excited state of Ne28, and using the previously determined B(E2) value, the neutron quadrupole transition matrix element has been calculated to be Mn=13.8±3.7fm2. In the neutron knockout reaction, two low-lying excited states were populated in Ne27. Only one of them can be interpreted by the sd shell model while the additional state may intrude from the fp shell. These experimental observations are consistent with the presence of fp shell configurations at low excitation energy in Ne27,28 nuclei caused by a vanishing N=20 shell gap at Z=10.

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