Halo structure of the island of inversion nucleus 31Ne.
Halo structure of the island of inversion nucleus 31Ne.
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DOI：
10.1103/physrevlett.103.262501
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发表时间：
2009-12
影响因子：
8.6
通讯作者：
Takashi 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. Orr;H. Otsu;T. Otsuka;A. Saito;H. Sakurai;S. Shimoura;T. Sumikama;H. Takeda;E. Takeshita;M. Takechi;Shotaro Takeuchi;Kazuhiro Tanaka;K. Tanaka;N. Tanaka;Y. Togano;Y. Utsuno;K. Yoneda;A. Yoshida;K. Yoshida
中科院分区：
文献类型：
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作者：
Takashi 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. Orr;H. Otsu;T. Otsuka;A. Saito;H. Sakurai;S. Shimoura;T. Sumikama;H. Takeda;E. Takeshita;M. Takechi;Shotaro Takeuchi;Kazuhiro Tanaka;K. Tanaka;N. Tanaka;Y. Togano;Y. Utsuno;K. Yoneda;A. Yoshida;K. Yoshida
利用日本理化学研究所的RIBF装置，在230 MeV/核子的能量下，测量了丰中子核~（31）Ne在Pb和C靶上的单中子去除截面。推导出的540（70）mb的大库仑破裂截面是软E1激发的指示。与直接破裂模型计算结果的比较表明，31 Ne的价中子占据低l轨道（最可能是2 p（3/2）），分离能小（S（n）约< 0.8 MeV），而不是像传统壳层有序理论所预期的那样主要在1f（7/2）轨道。这些发现表明，31 Ne是已知最重的晕系统。
The cross sections for single-neutron removal from the very neutron-rich nucleus 31Ne on Pb and C targets have been measured at 230 MeV/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 31Ne occupies a low-l orbital (most probably 2p(3/2)) with a small separation energy (S(n) approximately < 0.8 MeV), instead of being predominantly in the 1f(7/2) orbital as expected from the conventional shell ordering. These findings suggest that 31Ne is the heaviest halo system known.