期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.212503
关键词
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资金
- JSPS International Fellowship for Research in Japan
- JSPS Invitation Fellowship for Research in Japan
- Franco-Japanese LIA-International Associated Laboratory for Nuclear Structure Problems
- French EXPAND [ANR14-CE33-0022-02]
- JSPS KAKENHI Grants [JP24740154, JP16H02179, JP16K05352, JP24105005, JP18H05404]
- World Class University [R32-2008000-10155-0]
- Global Ph.D. Fellowship programs of NRF Korea [NRF-20110006492]
- Helmholtz International Center for FAIR
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.
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