Observation of strong low-lying E1 strength in the two-neutron halo nucleus Li 11

T. Nakamura, A. M. 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. ShimouraK. Watanabe, Y. X. Watanabe, T. Yakushiji, Y. Yanagisawa, K. Yoneda

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246 Citations (Scopus)

Abstract

An exclusive measurement has been made of the Coulomb dissociation of the two-neutron halo nucleus Li11 at 70MeV/nucleon at RIKEN. Strong low-energy (soft) E1 excitation is observed, peaked at about Ex=0.6MeV with B(E1)=1.42(18)e2fm2 for Erel≤3MeV, 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.

Original languageEnglish
Article number252502
JournalPhysical review letters
Volume96
Issue number25
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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