Microscopic description of the proton halo in $^{12}$N
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866909840956194816 |
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| author | Zhang, K. Y. Lu, X. X. |
| author_facet | Zhang, K. Y. Lu, X. X. |
| contents | The year 2025 marks the 40th anniversary of the discovery of halo nuclei and the 15th anniversary of the development of the deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc). In this work, we present the first DRHBc description of the proton halo phenomenon. The available experimental proton separation energies and empirical matter root-mean-square (rms) radii are reasonably well reproduced for the $N=5$ isotones, ranging from the stable nucleus $^{9}$Be to the drip-line nucleus $^{12}$N. In particular, the DRHBc theory captures the abrupt increase in rms radii at $^{12}$N, unambiguously corroborating its proton halo structure. The formation of this halo is attributed to the occupation of a weakly bound orbital with dominant $1p$ components by the valence proton, which contributes approximately $90\%$ to the diffused proton density of $^{12}$N at large distances from the nuclear center. A shape decoupling between the prolate core and the oblate halo in $^{12}$N is predicted. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_11038 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Microscopic description of the proton halo in $^{12}$N Zhang, K. Y. Lu, X. X. Nuclear Theory Nuclear Experiment The year 2025 marks the 40th anniversary of the discovery of halo nuclei and the 15th anniversary of the development of the deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc). In this work, we present the first DRHBc description of the proton halo phenomenon. The available experimental proton separation energies and empirical matter root-mean-square (rms) radii are reasonably well reproduced for the $N=5$ isotones, ranging from the stable nucleus $^{9}$Be to the drip-line nucleus $^{12}$N. In particular, the DRHBc theory captures the abrupt increase in rms radii at $^{12}$N, unambiguously corroborating its proton halo structure. The formation of this halo is attributed to the occupation of a weakly bound orbital with dominant $1p$ components by the valence proton, which contributes approximately $90\%$ to the diffused proton density of $^{12}$N at large distances from the nuclear center. A shape decoupling between the prolate core and the oblate halo in $^{12}$N is predicted. |
| title | Microscopic description of the proton halo in $^{12}$N |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2510.11038 |