Halo Structure of the Neutron-Dripline Nucleus 19B

被引：79

作者：

Cook, K. J. ^{[1
,16
]}

Nakamura, T. ^{[1
]}

Kondo, Y. ^{[1
]}

Hagino, K. ^{[2
]}

Ogata, K. ^{[3
,4
]}

Saito, A. T. ^{[1
]}

Achouri, N. L. ^{[5
]}

Aumann, T. ^{[6
,7
,8
]}

Baba, H. ^{[9
]}

Delaunay, F. ^{[5
]}

Deshayes, Q. ^{[5
]}

Doomenbal, P. ^{[9
]}

Fukuda, N. ^{[9
]}

Gibelin, J. ^{[5
]}

Hwang, J. W. ^{[10
]}

Inabe, N. ^{[9
]}

Isobe, T. ^{[9
]}

Kameda, D. ^{[9
]}

Kanno, D. ^{[1
]}

Kim, S. ^{[10
]}

Kobayashi, N. ^{[1
]}

Kobayashi, T. ^{[11
]}

Kubo, T. ^{[9
]}

Leblond, S. ^{[5
,13
]}

Lee, J. ^{[9
,17
]}

Marques, F. M. ^{[5
]}

Minakata, R. ^{[1
]}

Motobayashi, T. ^{[9
]}

Muto, K. ^{[11
]}

Murakami, T. ^{[2
]}

Murai, D. ^{[12
]}

Nakashima, T. ^{[1
]}

Nakatsuka, N. ^{[2
]}

Navin, A. ^{[13
]}

Nishi, S. ^{[1
]}

Ogoshi, S. ^{[1
]}

Orr, N. A. ^{[5
]}

Otsu, H. ^{[9
]}

Sato, H. ^{[9
]}

Satou, Y. ^{[10
]}

Shimizu, Y. ^{[9
]}

Suzuki, H. ^{[9
]}

Takahashi, K. ^{[11
]}

Takeda, H. ^{[9
]}

Takeuchi, S. ^{[1
,9
]}

Tanaka, R. ^{[1
]}

Togano, Y. ^{[7
,8
,12
]}

Tsubota, J. ^{[1
]}

Tuff, A. G. ^{[14
]}

Vandebrouck, M. ^{[15
,18
]}

机构：

[1] Tokyo Inst Technol, Dept Phys, Meguro Ku, 2-12-1 0 Okayama, Tokyo 1528551, Japan

[2] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[3] Osaka Univ, Res Ctr Nucl Phys, Ibaraki 5670047, Japan

[4] Osaka City Univ, Dept Phys, Osaka 5588585, Japan

[5] Normandie Univ, LPC Caen, ENSICAEN, UNICAEN,CNRS,IN2P3, F-14050 Caen, France

[6] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany

[7] GSI Helmholtzzentrum Schwerionenforsch GmbH, ExtreMe Matter Inst EMMI, D-64291 Darmstadt, Germany

[8] GSI Helmholtzzentrum Schwerionenforsch GmbH, Res Div, D-64291 Darmstadt, Germany

[9] RIKEN, Nishina Ctr, Hirosawa 2-1, Wako, Saitama 3510198, Japan

[10] Seoul Natl Univ, Dept Phys & Astron, 599 Gwanak, Seoul 151742, South Korea

[11] Tohoku Univ, Dept Phys, Aoba Ku, Aramaki Aoba 6-3, Sendai, Miyagi 9808578, Japan

[12] Rikkyo Univ, Dept Phys, Tokyo 1718501, Japan

[13] CEA DRF CNRS IN2P3, GANIL, F-14076 Caen 05, France

[14] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

[15] Univ Paris Sud, IPN Orsay, IN2P3, CNRS, F-91406 Orsay, France

[16] Michigan State Univ, Facil Rare Isotope Beams, E Lansing, MI 48824 USA

[17] Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Peoples R China

[18] Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 21期

关键词：

COULOMB DISSOCIATION; EXCITATIONS; PROGRESS; RADII; LI-10;

D O I：

10.1103/PhysRevLett.124.212503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The heaviest bound isotope of boron B-19 has been investigated using exclusive measurements of its Coulomb dissociation, into B-17 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) e(2) fm(2) for relative energies below 6 MeV. This feature, known as a soft E1 excitation, provides the first firm evidence that B-19 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.

引用

页数：7

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