The universal size compression effect of nucleon pair in finite nuclei

TL;DR

This paper reveals a universal size compression effect of nucleon pairs at the nuclear surface across various nuclei, highlighting a common structural feature linked to BCS- and BEC-like pairing, with implications for experimental studies.

Contribution

It introduces the discovery of a universal size compression effect of nucleon pairs in finite nuclei through systematic microscopic calculations.

Findings

All nucleon pairs show size compression at the nuclear surface.

The effect is independent of nucleon species and binding energies.

The results relate to BCS- and BEC-like pairing phenomena.

Abstract

We systematically investigate the size evolution of the di-neutron (2n), di-proton (2p), and deuteron (d) in 6He, 14Be, 17B, 6Be, 17Ne, and 6Li using microscopic calculations. Remarkably, all nucleon pairs exhibit a universal size compression at the nuclear surface, regardless of their species and binding energies. These features correspond to the BCS- and BEC-like nucleon pairs, which recent experimental techniques can further investigate.