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29 March 2024
 
  » arxiv » 1901.0455

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First observation of 20B and 21B
S. Leblond ; F.M. Marqués ; J. Gibelin ; N.A. Orr ; Y. Kondo ; T. Nakamura ; J. Bonnard ; N. Michel ; N.L. Achouri ; T. Aumann ; H. Baba ; F. Delaunay ; Q. Deshayes ; P. Doornenbal ; N. Fukuda ; J.W. Hwang ; N. Inabe ; T. Isobe ; D. Kameda ; D. Kanno ; S. Kim ; N. Kobayashi ; T. Kobayashi ; T. Kubo ; J. Lee ; R. Minakata ; T. Motobayashi ; D. Murai ; T. Murakami ; K. Muto ; T. Nakashima ; N. Nakatsuka ; A. Navin ; S. Nishi ; S. Ogoshi ; H. Otsu ; H. Sato ; Y. Satou ; Y. Shimizu ; H. Suzuki ; K. Takahashi ; H. Takeda ; S. Takeuchi ; R. Tanaka ; Y. Togano ; A.G. Tuff ; M. Vandebrouck ; K. Yoneda ;
Date 2 Jan 2019
AbstractThe most neutron-rich boron isotopes 20B and 21B have been observed for the first time following proton removal from 22N and 22C at energies around 230 MeV/nucleon. Both nuclei were found to exist as resonances which were detected through their decay into 19B and one or two neutrons. Two-proton removal from 22N populated a prominent resonance-like structure in 20B 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 22C, the 19B plus one- and two-neutron channels were consistent with the population of a resonance in 21B 2.47+-0.19 MeV above the two-neutron decay threshold, which is found to exhibit direct two-neutron decay. The ground-state mass excesses determined for 20,21B are found to be in agreement with mass surface extrapolations derived within the latest atomic-mass evaluations.
Source arXiv, 1901.0455
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