Abstract
The most neutron-rich boron isotopes and have been observed for the first time following proton removal from and at energies around . Both nuclei were found to exist as resonances which were detected through their decay into and one or two neutrons. Two-proton removal from populated a prominent resonancelike structure in at around 2.5 MeV above the one-neutron decay threshold, which is interpreted as arising from the closely spaced ground-state doublet predicted by the shell model. In the case of proton removal from , the plus one- and two-neutron channels were consistent with the population of a resonance in above the two-neutron decay threshold, which is found to exhibit direct two-neutron decay. The ground-state mass excesses determined for are found to be in agreement with mass surface extrapolations derived within the latest atomic-mass evaluations.
- Received 7 September 2018
- Revised 23 October 2018
DOI:https://doi.org/10.1103/PhysRevLett.121.262502
© 2018 American Physical Society