Detailed study of decay properties of 7He nucleus states in ab initio approach

TL;DR

This paper uses an ab initio approach with the No-Core Shell Model to calculate energies and decay widths of 7He states, demonstrating the method's ability to handle diverse decay channels and comparing results with other microscopic calculations.

Contribution

It introduces a comprehensive ab initio method for calculating decay properties of 7He states, including a novel approach for matching cluster form factors with asymptotic wave functions.

Findings

Accurate energies and decay widths for 7He states were obtained.

The method effectively handles various decay channels with different fragmentation types.

Results are consistent with other microscopic calculations.

Abstract

The energies and decay widths of the states of the exotic 7He nucleus are studied in an ab initio approach. The spectrum of these states is calculated using No-Core Shell Model and corresponding extrapolation procedure. Well-proven on a large amount of data the Daejeon16 potential is used in the calculations. The previously developed NCSM-based approach, which includes a method for constructing the basis of orthogonalized functions of cluster channels and a procedure for matching the cluster form factors obtained within this method with the corresponding asymptotic wave functions, is applied to compute the decay widths of the levels. The possibilities of the approach for calculating the partial decay widths of nuclear states into various channels strongly differing in type of fragmentation, spin, angular momentum of relative motion, and amplitude are demonstrated. The results obtained are compared with the results of other microscopic calculations.