Observation of Strong Low-Lying E1 Strength in the Two-Neutron Halo Nucleus {sup 11}Li

Journal Article · Fri Jun 30 00:00:00 EDT 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.96.252502· OSTI ID:20775291

Nakamura, T; Vinodkumar, A M; Sugimoto, T; Kondo, Y; Miura, M ^[1]; Aoi, N; Fukuda, N; Gomi, T; Ishihara, M; Kubo, T; Motobayashi, T; Sakurai, H; Yanagisawa, Y; Yoneda, K ^[2]; Baba, H; Hasegawa, H ^[3]; Bazin, D ^[4]; Imai, N; Watanabe, Y X ^[5]; Kobayashi, T ^[6]

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1. Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551 (Japan)
2. RIKEN, Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
3. Department of Physics, Rikkyo University, 3-34-1, Nishi-Ikebukuro, Toshima, Tokyo 171-8501 (Japan)
4. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321 (United States)
5. High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801 (Japan)
6. Department of Physics, Tohoku University, 2-1 Aoba, Aramaki, Aoba, Sendai 980-8578 (Japan)

An exclusive measurement has been made of the Coulomb dissociation of the two-neutron halo nucleus {sup 11}Li at 70 MeV/nucleon at RIKEN. Strong low-energy (soft) E1 excitation is observed, peaked at about E{sub x}=0.6 MeV with B(E1)=1.42(18) e{sup 2} fm{sup 2} for E{sub rel}{<=}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.

• OSTI ID: 20775291
• Journal Information: Physical Review Letters, Vol. 96, Issue 25; Other Information: DOI: 10.1103/PhysRevLett.96.252502; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
E1-TRANSITIONS
EXCITATION
LITHIUM 11
MEV RANGE 10-100
NEUTRONS
NUCLEAR HALOS
SUM RULES
THREE-BODY PROBLEM