Observation of strong low-lying E1 strength in the two-neutron halo nucleus 11Li.
Observation of strong low-lying E1 strength in the two-neutron halo nucleus 11Li.
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DOI：
10.1103/physrevlett.96.252502
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发表时间：
2006-06
影响因子：
8.6
通讯作者：
T. Nakamura;A. Vinodkumar;T. Sugimoto;N. Aoi;H. Baba;D. Bazin;N. Fukuda;T. Gomi;H. Hasegawa;N. Imai;M. Ishihara;T. Kobayashi;Y. Kondo;T. Kubo;M. Miura;T. Motobayashi;H. Otsu;A. Saito;H. Sakurai;S. Shimoura;K. Watanabe;Y. Watanabe;T. Yakushiji;Y. Yanagisawa;K. Yoneda
中科院分区：
文献类型：
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作者：
T. Nakamura;A. Vinodkumar;T. Sugimoto;N. Aoi;H. Baba;D. Bazin;N. Fukuda;T. Gomi;H. Hasegawa;N. Imai;M. Ishihara;T. Kobayashi;Y. Kondo;T. Kubo;M. Miura;T. Motobayashi;H. Otsu;A. Saito;H. Sakurai;S. Shimoura;K. Watanabe;Y. Watanabe;T. Yakushiji;Y. Yanagisawa;K. Yoneda
在70 MeV/核子的能量下，对双中子晕核~（11）Li的库仑离解进行了独家测量。观察到强低能（软）E1激发，在Erel <或= 3 MeV时，在Ex = 0.6 MeV左右达到峰值，其中B（E1）= 1.42（18）e2 fm 2，这在以前的测量中很大程度上被错过了。这种激发代表了在如此低的激发能量下观察到的最强的E1跃迁。用具有强双中子关联的三体模型很好地再现了该谱，E1非能量加权簇和规则进一步支持了该模型。
An exclusive measurement has been made of the Coulomb dissociation of the two-neutron halo nucleus 11Li at 70 MeV/nucleon at RIKEN. Strong low-energy (soft) E1 excitation is observed, peaked at about Ex = 0.6 MeV with B(E1) = 1.42(18) e2fm2 for Erel < or = 3 MeV, which was largely missed in previous measurements. This excitation represents the strongest E1 transition ever observed at such low excitation energies. The spectrum is reproduced well by a three-body model with a strong two-neutron correlation, which is further supported by the E1 non-energy-weighted cluster sum rule.