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Halo Structure of the Neutron-Dripline Nucleus B19

K. J. Cook et al.
Phys. Rev. Lett. 124, 212503 – Published 27 May 2020

Abstract

The heaviest bound isotope of boron B19 has been investigated using exclusive measurements of its Coulomb dissociation, into B17 and two neutrons, in collisions with Pb at 220MeV/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)e2fm2 for relative energies below 6 MeV. This feature, known as a soft E1 excitation, provides the first firm evidence that B19 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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  • Received 9 March 2020
  • Revised 24 April 2020
  • Accepted 6 May 2020

DOI:https://doi.org/10.1103/PhysRevLett.124.212503

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 124, Iss. 21 — 29 May 2020

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