Role of unitary correlation operator on high-momentum antisymmetrized molecular dynamics using bare NN interaction for 3H and 4He

TL;DR

This paper enhances high-momentum antisymmetrized molecular dynamics by integrating the unitary correlation operator method to better account for short-range correlations in light nuclei, achieving results consistent with ab initio calculations.

Contribution

It introduces a combined HMAMD+UCOM approach that effectively incorporates short-range and tensor correlations for accurate nuclear structure calculations.

Findings

Accurately reproduces binding energies of 3H and 4He

Effectively separates short-range and tensor correlation roles

Achieves results consistent with ab initio methods

Abstract

We extend the high-momentum antisymmetrized molecular dynamics (HMAMD) by incorporating the short-range part of the unitary correlation operator method (UCOM) as the variational method of finite nuclei. In this HMAMD+UCOM calculation of light nuclei, the HMAMD is mainly in charge of the tensor correlation with up to the four-body correlation, while the short-range correlation is further improved by using the UCOM. The binding energies of the 3H and 4He nuclei are calculated with this HMAMD+UCOM using the AV8' bare nucleon-nucleon (NN) interaction. The different roles of the short-range and tensor correlations from the HMAMD and UCOM are analyzed in the numerical results. Compared with the previous calculations based on the different variational methods, this newly extended HMAMD+UCOM method can almost provide the consistent results with the ab initio results.