First Observation of B20 and B21

S. Leblond et al.
Phys. Rev. Lett. 121, 262502 – Published 27 December 2018
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Abstract

The most neutron-rich boron isotopes B20 and B21 have been observed for the first time following proton removal from N22 and C22 at energies around 230MeV/nucleon. Both nuclei were found to exist as resonances which were detected through their decay into B19 and one or two neutrons. Two-proton removal from N22 populated a prominent resonancelike structure in B20 at around 2.5 MeV above the one-neutron decay threshold, which is interpreted as arising from the closely spaced 1,2 ground-state doublet predicted by the shell model. In the case of proton removal from C22, the B19 plus one- and two-neutron channels were consistent with the population of a resonance in B21 2.47±0.19MeV above the two-neutron decay threshold, which is found to exhibit direct two-neutron decay. The ground-state mass excesses determined for B20,21 are found to be in agreement with mass surface extrapolations derived within the latest atomic-mass evaluations.

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  • Received 7 September 2018
  • Revised 23 October 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.262502

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 121, Iss. 26 — 28 December 2018

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