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1. Bound excited states in F-27

Author

Elekes, Z., Dombradi, Z., Saito, A., Aoi, N., Baba, H., Demichi, K., Fulop, Z., 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, A., Ohnishi, Tk, Ong, Hj, Ota, S., Ozawa, A., Sakai, Hk, Sakurai, H., Susumu Shimoura, Takeshita, E., Takeuchi, S., Tamaki, A., Togano, Y., Yamada, K., Yanagisawa, Y., and Yoneda, K.

2. Vanishing N = 20 shell gap: study of excited states in (27,28)Ne.

Author

Dombrádi Z, Elekes Z, Saito A, Aoi N, Baba H, Demichi K, Fülöp Z, 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, and Yoneda K

Abstract

This Letter reports on the (1)H((28)Ne, (28)Ne) and (1)H((28)Ne, (27)Ne) reactions studied at intermediate energy using a liquid hydrogen target. From the cross section populating the first 2(+) excited state of (28)Ne, and using the previously determined BE(2) value, the neutron quadrupole transition matrix element has been calculated to be M(n)=13.8 +/- 3.7 fm(2). In the neutron knockout reaction, two low-lying excited states were populated in (27)Ne. 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 (27,28)Ne nuclei caused by a vanishing N=20 shell gap at Z=10.

Published
2006
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