Structure and decay of 21B resonances
Abstract
The structure of the neutron-rich nucleus 21B is investigated within a three-body model consisting of a 19B core and two neutrons. The three-body wave functions are computed using the hyperspherical adiabatic expansion method combined with the complex-scaling technique. Four potential parametrizations compatible with the available experimental information on 20B are considered. The calculations predict a low-lying 3/2- state below the experimentally observed resonance at 2.47~MeV. An analysis of the dependence on the three-body interaction shows that this state cannot be shifted to the experimental resonance energy; instead, it remains either bound or becomes a near-threshold resonance with a rapidly increasing width. These results indicate that the observed resonance is more naturally interpreted as the second 3/2- state, whereas a lower-lying 3/2- state, dominated by an s1/2 configuration, has so far eluded experimental observation. Momentum correlations are obtained for the experimentally observed resonance. In addition, the existence of other resonances is investigated.
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BibTeX
@misc{alvarezrodriguez2026structure,
title = {{Structure and decay of $^21$B resonances}},
author = {R. Alvarez-Rodriguez and E. Garrido},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.32714},
eprint = {2609.32714},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.32714},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Structure and decay of ^21B resonances
AU - R. Alvarez-Rodriguez
AU - E. Garrido
PY - 2026
DA - 2026/09/26
PB - arXiv
DO - 10.48550/arxiv.2609.32714
UR - https://arxiv.org/abs/2609.32714
AB - The structure of the neutron-rich nucleus ^21B is investigated within a three-body model consisting of a ^19B core and two neutrons. The three-body wave functions are computed using the hyperspherical adiabatic expansion method combined with the complex-scaling technique. Four potential parametrizations compatible with the available experimental information on ^20B are considered. The calculations predict a low-lying 3/2^- state below the experimentally observed resonance at 2.47~MeV. An analysis of the dependence on the three-body interaction shows that this state cannot be shifted to the experimental resonance energy; instead, it remains either bound or becomes a near-threshold resonance with a rapidly increasing width. These results indicate that the observed resonance is more naturally interpreted as the second 3/2^- state, whereas a lower-lying 3/2^- state, dominated by an s_1/2 configuration, has so far eluded experimental observation. Momentum correlations are obtained for the experimentally observed resonance. In addition, the existence of other resonances is investigated.
ER -