Unveiling potential neutron halos in intermediate-mass nuclei: an \textit{ab initio} study
| Title: | Unveiling potential neutron halos in intermediate-mass nuclei: an \textit{ab initio} study |
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| Authors: | Li, H. H., Li, J. G., Xie, M. R., Zuo, W. |
| Publication Year: | 2024 |
| Collection: | Nuclear Theory |
| Subject Terms: | Nuclear Theory |
| More Details: | Halos epitomize the fascinating interplay between weak binding, shell evolution, and deformation effects, especially in nuclei near the drip line. In this Letter, we apply the state-of-the-art \textit{ab initio} valence-space in-medium similarity renormalization group approach to predict potential candidates for one- and two-neutron halo in the intermediate-mass region. Notably, we use spectroscopic factors (SF) and two-nucleon amplitudes (TNA) as criteria for suggesting one- and two-neutron halo candidates, respectively. This approach is not only theoretically sound but also amenable to experimental validation. Our research focuses on Mg, Al, Si, P, and S neutron-drip-line nuclei, offering systematic predictions of neutron halo candidates in terms of separation energies, SF (TNA), and average occupation. The calculation suggests the ground states of $^{40,42,44,46}$Al, $^{41,43,45,47}$Si, $^{46,48}$P, and $^{47,49}$S are promising candidates for one-neutron halos, while $^{40,42,44,46}$Mg, $^{45,47}$Al, $^{46,48}$Si, $^{49}$P, and $^{50}$S may harbor two-neutron halos. In addition, the relative mean-square neutron radius between halo nuclei and \textit{inner core} is calculated for suggested potential neutron halos. Finally, the relations of halo formations and shell evolution are discussed. |
| Document Type: | Working Paper |
| Access URL: | http://arxiv.org/abs/2406.08151 |
| Accession Number: | edsarx.2406.08151 |
| Database: | arXiv |
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