Longitudinal response function of 4He with a realistic force

TL;DR

This paper calculates the longitudinal response function of helium-4 using a realistic nuclear force and shows that including a three-body force improves agreement with experimental data, especially in the quasi-elastic peak.

Contribution

It demonstrates that incorporating a three-body force, specifically Urbana IX, refines theoretical predictions of helium-4's response function, aligning better with experiments.

Findings

Adding three-body force suppresses the response in the quasi-elastic peak.

Comparison indicates the need for three-body forces in realistic nuclear models.

Results align more closely with experimental data when three-body interactions are included.

Abstract

The longitudinal response function of 4He is calculated with the Argonne V18 potential. The comparison with experiment suggests the need of a three-body force. When adding the Urbana IX three-body potential in the calculation of the lower longitudinal multipoles, the total strength is suppressed in the quasi-elastic peak, towards the trend of the experimental data.