Chiral interactions and superfluidity in the calcium isotopic chain
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866918501402279936 |
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| author | Scalesi, A. Ekström, A. Forssén, C. Hagen, G. |
| author_facet | Scalesi, A. Ekström, A. Forssén, C. Hagen, G. |
| contents | We perform ab initio calculations of three-point mass differences in the odd- and even-mass $^{39-49}$Ca isotopes to probe nuclear superfluidity via empirical neutron pairing gaps. We also quantify the sensitivity of those gaps to the parameters of the interaction at mean-field level. Recent studies employing accurate chiral nuclear interactions have found these gaps to be too small. We show that experimental values can be reproduced at mean-field level by substantially increasing the attraction of the singlet $S$-wave two-nucleon contact interaction, but doing so induces an unphysical bound state of the di-neutron. The sensitivity of these predictions to the full calibration of the nuclear interaction is then studied by performing Bayesian posterior sampling in a delta-full chiral effective field theory at third chiral order. We find that pairing gaps remain largely unaffected, leaving the explanation of nuclear superfluidity as a future task for improved many-body modeling and refined interactions at higher chiral orders. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_20942 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Chiral interactions and superfluidity in the calcium isotopic chain Scalesi, A. Ekström, A. Forssén, C. Hagen, G. Nuclear Theory We perform ab initio calculations of three-point mass differences in the odd- and even-mass $^{39-49}$Ca isotopes to probe nuclear superfluidity via empirical neutron pairing gaps. We also quantify the sensitivity of those gaps to the parameters of the interaction at mean-field level. Recent studies employing accurate chiral nuclear interactions have found these gaps to be too small. We show that experimental values can be reproduced at mean-field level by substantially increasing the attraction of the singlet $S$-wave two-nucleon contact interaction, but doing so induces an unphysical bound state of the di-neutron. The sensitivity of these predictions to the full calibration of the nuclear interaction is then studied by performing Bayesian posterior sampling in a delta-full chiral effective field theory at third chiral order. We find that pairing gaps remain largely unaffected, leaving the explanation of nuclear superfluidity as a future task for improved many-body modeling and refined interactions at higher chiral orders. |
| title | Chiral interactions and superfluidity in the calcium isotopic chain |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2601.20942 |