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Title: Halo Structure of the Neutron-Dripline Nucleus ¹⁹B
Authors: Cook, K. J.
Nakamura, T.
Kondo, Y.
Hagino, K.
Ogata, K.
Saito, A. T.
Achouri, N. L.
Aumann, T.
Baba, H.
Delaunay, F.
Deshayes, Q.
Doornenbal, P.
Fukuda, N.
Gibelin, J.
Hwang, J. W.
Inabe, N.
Isobe, T.
Kameda, D.
Kanno, D.
Kim, S.
Kobayashi, N.
Kobayashi, T.
Kubo, T.
Leblond, S.
Lee, J.
Marqués, F. M.
Minakata, R.
Motobayashi, T.
Muto, K.
Murakami, T.
Murai, D.
Nakashima, T.
Nakatsuka, N.
Navin, A.
Nishi, S.
Ogoshi, S.
Orr, N. A.
Otsu, H.
Sato, H.
Satou, Y.
Shimizu, Y.
Suzuki, H.
Takahashi, K.
Takeda, H.
Takeuchi, S.
Tanaka, R.
Togano, Y.
Tsubota, J.
Tuff, A. G.
Vandebrouck, M.
Yoneda, K.
Author's alias: 中村, 隆司
近藤, 洋介
萩野, 浩一
大津, 秀暁
米田, 健一郎
Issue Date: 29-May-2020
Publisher: American Physical Society (APS)
Journal title: Physical Review Letters
Volume: 124
Issue: 21
Thesis number: 212503
Abstract: The heaviest bound isotope of boron ¹⁹B has been investigated using exclusive measurements of its Coulomb dissociation, into ¹⁷B and two neutrons, in collisions with Pb at 220 MeV/nucleon. Enhanced electric dipole (E1) strength is observed just above the two-neutron decay threshold with an integrated E1 strength of B(E1)=1.64±0.06(stat)±0.12(sys) e² fm² for relative energies below 6 MeV. This feature, known as a soft E1 excitation, provides the first firm evidence that ¹⁹B has a prominent two-neutron halo. Three-body calculations that reproduce the energy spectrum indicate that the valence neutrons have a significant s-wave configuration and exhibit a dineutronlike correlation.
Description: コンパクトな新奇中性子対の新たな証拠を発見 --不安定核ビームを用いた実験と少数系理論により実現--. 京都大学プレスリリース. 2020-06-22.
Rights: © 2020 American Physical Society
DOI(Published Version): 10.1103/PhysRevLett.124.212503
PubMed ID: 32530691
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