Observation of Strong Low-Lying $E1$ Strength in the Two-Neutron Halo Nucleus $^{11}\mathrm{Li}$

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Observation of Strong Low-Lying $E 1$ Strength in the Two-Neutron Halo Nucleus ${}^{11}{Li}$

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. Shimoura, K. Watanabe, Y. X. Watanabe, T. Yakushiji, Y. Yanagisawa, and K. Yoneda

Phys. Rev. Lett. 96, 252502 – Published 30 June 2006

Abstract

An exclusive measurement has been made of the Coulomb dissociation of the two-neutron halo nucleus ${}^{11}{Li}$ at $70 MeV / nucleon$ at RIKEN. Strong low-energy (soft) $E 1$ excitation is observed, peaked at about $E_{x} = 0.6 MeV$ with $B (E 1) = 1.42 (18) e^{2} {fm}^{2}$ for $E_{rel} \leq 3 MeV$ , which was largely missed in previous measurements. This excitation represents the strongest $E 1$ 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 $E 1$ non-energy-weighted cluster sum rule.

Received 10 April 2006

DOI:https://doi.org/10.1103/PhysRevLett.96.252502

Authors & Affiliations

T. Nakamura¹, A. M. Vinodkumar¹, T. Sugimoto¹, N. Aoi², H. Baba³, D. Bazin⁴, N. Fukuda², T. Gomi², H. Hasegawa³, N. Imai⁵, M. Ishihara², T. Kobayashi⁶, Y. Kondo¹, T. Kubo², M. Miura¹, T. Motobayashi², H. Otsu⁶, A. Saito⁷, H. Sakurai², S. Shimoura⁷, K. Watanabe⁶, Y. X. Watanabe⁵, T. Yakushiji⁶, Y. Yanagisawa², and K. Yoneda²

¹Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan
²RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
³Department of Physics, Rikkyo University, 3-34-1, Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
⁴National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
⁵High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
⁶Department of Physics, Tohoku University, 2-1 Aoba, Aramaki, Aoba, Sendai 980-8578, Japan
⁷CNS, University of Tokyo, RIKEN campus, Hirosawa 2-1, Wako, Saitama 351-0198, Japan

Breaking Up is Easy to Do

David Lindley

Phys. Rev. Focus 17, 23 (2006)

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Vol. 96, Iss. 25 — 30 June 2006

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Physical Review Letters

Observation of Strong Low-Lying $E 1$ Strength in the Two-Neutron Halo Nucleus ${}^{11}{Li}$

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. Shimoura, K. Watanabe, Y. X. Watanabe, T. Yakushiji, Y. Yanagisawa, and K. Yoneda

Phys. Rev. Lett. 96, 252502 – Published 30 June 2006

Abstract

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Breaking Up is Easy to Do

David Lindley

Phys. Rev. Focus 17, 23 (2006)

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Physical Review Letters

Observation of Strong Low-Lying E1 Strength in the Two-Neutron Halo Nucleus Li11

Phys. Rev. Lett. 96, 252502 – Published 30 June 2006

Abstract

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Breaking Up is Easy to Do

David Lindley

Phys. Rev. Focus 17, 23 (2006)

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Observation of Strong Low-Lying $E 1$ Strength in the Two-Neutron Halo Nucleus ${}^{11}{Li}$