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arXiv · 2512.15454

Universality of nucleon short-range behavior with chiral forces

Xiang-Xiang Sun·Hoai Le·Ulf-G. Meißner·Andreas Nogga
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Abstract

Modern advanced nuclear ab initio approaches with the similarity renormalization group (SRG) softened interactions miss high-momentum information, thus rendering them less suitable for characterizing nucleon-nucleon short-range physics. We introduce a novel framework to construct SRG-independent nuclear wave functions from No-Core Shell Model calculations. Applying our method to densities obtained with semilocal momentum-space-regularized chiral NN and NNN forces, we show key universalities of short-range behavior: (1) The two-body density ratio in the np S=1 channel, relative to the deuteron (d), is remarkably insensitive to interaction details. (2) More strikingly, while the ratio of total two-body densities to the deuteron exhibits cutoff dependence, the same ratio to the $\alpha$-particle (4-He) is almost independent of the interactions.

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Xiang-Xiang Sun, Hoai Le, Ulf-G. Meißner, Andreas Nogga. 2025-12-17. Universality of nucleon short-range behavior with chiral forces. https://arxiv.org/abs/2512.15454

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