Year: 2020
Type: article
Abstract: The heaviest bound isotope of boron ^{19}B has been investigated using exclusive measurements of its Coulomb dissociation, into ^{17}B 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 ^{19}B 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.
Source: Physical Review Letters
Authors: K. J. Cook, T. Nakamura, Y. Kondo, K. Hagino, K. Ogata, A. T. Saito, N. L. Achouri, T. Aumann, H. Baba, F. Delaunay, Q. Deshayes, P. Doornenbal, N. Fukuda, J. Gibelin, J. W. Hwang, N. Inabe, T. Isobe, D. Kameda, D. Kanno, S. Kim, N. Kobayashi, T. Kobayashi, T. Kubo, S. Leblond, J. Lee, F. M. Marqués, R. Minakata, T. Motobayashi, K. Muto, T. Murakami, D. Murai, T. Nakashima, N. Nakatsuka, A. Navin, S. Nishi, S. Ogoshi, N. A. Orr, H. Otsu, H. Sato, Y. Satou, Y. Shimizu, H. Suzuki, K. Takahashi, H. Takeda, S. Takeuchi, R. Tanaka, Y. Togano, J. Tsubota, A. G. Tuff, M. Vandebrouck, K. Yoneda
Institutions: Tokyo Institute of Technology, Kyoto University, Osaka City University, The University of Osaka, Centre National de la Recherche Scientifique, École Nationale Supérieure d'Ingénieurs de Caen, Normandie Université, Laboratoire de Physique Corpusculaire de Caen, Institut National de Physique Nucléaire et de Physique des Particules, Université de Caen Normandie, GSI Helmholtz Centre for Heavy Ion Research, Technische Universität Darmstadt, ExtreMe Matter Institute EMMI, RIKEN Nishina Center, Seoul National University, Tohoku University, Rikkyo University, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Grand Accélérateur National d'Ions Lourds, University of York, Université Paris-Sud
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: Elucidation of the many-nucleon correlations and breakdown of the single-particle nature of nuclei via multi-nucleon knockout reactions, Study of excited nuclear states via recoil distance transmission method, G229825186, Dineutron in unstable nuclei probed by spin correlations, G3996022320, Study of neutrno-rich nuclei via isospin-increasing charge exchange reaction, Explorations across the neutron dripline, G5289410359, G5478458683, mass measurements of neutron-rich oxygen isotopes, 日本における商店街の衰退と発展過程の研究, G87242835, G958348205
OpenAlex ID: W3032718612