Short-range and tensor correlations in 4He and 8Be studied with antisymmetrized quasi cluster model

TL;DR

This study uses an advanced antisymmetrized quasi cluster model with realistic NN interactions to analyze short-range and tensor correlations in 4He and 8Be, revealing how NN channels influence cluster interactions.

Contribution

It introduces a tensor version of the antisymmetrized quasi cluster model capable of treating multiple NN correlation channels with realistic interactions.

Findings

The pn pair in 3D channel is crucial for tensor correlation in 4He.

Pauli blocking suppresses 3D pairs in 8Be, affecting NN correlations.

The model captures the impact of NN correlations on cluster interactions.

Abstract

We apply tensor version of antisymmetrized quasi cluster model (AQCM-T) to 4He and 8Be while focusing on the NN correlations in alpha clusters. We adopt the NN interactions including realistic ones containing a repulsive core for the central part in addition to the tensor part. In 4He, the pn pair in the 3D channel has been known to play a decisive role in the tensor correlation and the framework is capable of treating not only this channel but also the NN correlations in the 1S and 3S channels. In 8Be, when two alpha clusters approach, the 3D pair is suppressed because of the Pauli blocking effect, which induces the decrease of the 3S component through the 3S-3D coupling. This effect results in the reduction of the attractive effect of the central-even interaction in the middle-range region.