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A=2, 3, 4 nuclear contact coefficients in the generalized contact formalism

E. Proietti1,2,*, L. E. Marcucci1,2,†, and M. Viviani2,‡

  • *Contact author: eleonora.proietti@phd.unipi.it
  • †Contact author: laura.elisa.marcucci@unipi.it
  • ‡Contact author: michele.viviani@pi.infn.it
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Phys. Rev. C 113, 024005 – Published 17 February, 2026

DOI: https://doi.org/10.1103/s2wn-hnqx

Abstract

We present a theoretical calculation for the A=2,3, and 4 nuclear contact coefficients within the generalized contact formalism, using both local and nonlocal chiral potentials. The hyperspherical harmonics method is employed to calculate the nuclear wave functions, from which we derive two-body momentum distributions and density functions to extract the contact coefficients. We have extracted the contact coefficients from two-body momentum distributions or from density functions, for a given nucleus and potential, and we have found that the generalized contact formalism predictions are verified in the triplet spin channel for local and nonlocal potentials. On the other hand, some significant tensions exist for the singlet channels, especially when studied with nonlocal potentials. We have also analyzed the model-independence of the ratios between the contact coefficients, which we have found to be quite satisfied. This study extends previous works based on local interaction models only.

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Phys. Rev. C 113, 024005– Published 17 February, 2026
  • Received 5 August 2025
  • Revised 20 November 2025
  • Accepted 13 January 2026
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