Chiral interactions and superfluidity in the calcium isotopic chain

Fuente: arXiv
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Main Authors: Scalesi, A., Ekström, A., Forssén, C., Hagen, G.
Format: Preprint
Published: 2026
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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