Effective three-body interactions in nuclei

TL;DR

This paper explains three-body nuclear forces in the $1f_{7/2}$ shell as effective interactions arising from the influence of higher-lying shells, supported by spectroscopic evidence from calcium isotopes and isotones.

Contribution

It introduces a natural explanation for three-body forces in nuclei as effective interactions caused by excluded higher shells, specifically the $2p_{3/2}$ orbit.

Findings

Three-body forces are explained as effective interactions from higher shells.

Spectroscopic properties of Ca isotopes support the model.

The $2p_{3/2}$ orbit plays a key role in the effective interaction.

Abstract

It is shown that the three-body forces in the $1f_{7/2}$ shell, for which recently evidence was found on the basis of spectroscopic properties of the Ca isotopes and $N=28$ isotones, can be most naturally explained as an effective interaction due to excluded higher-lying shells, in particular the $2p_{3/2}$ orbit.}