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Observation of strong low-lying E1 strength in the two-neutron halo nucleus 11Li |
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| Authors: | Nakamura T Vinodkumar A M Sugimoto T Aoi N Baba H Bazin D Fukuda N Gomi T Hasegawa H Imai N Ishihara M Kobayashi T Kondo Y Kubo T Miura M Motobayashi T Otsu H Saito A Sakurai H Shimoura S Watanabe K Watanabe Y X Yakushiji T Yanagisawa Y Yoneda K |
| Institution: | Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan. |
| Abstract: | 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. |
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