Novel approach to excitation spectrum from correlated ground state

TL;DR

This paper introduces a new Monte Carlo Shell Model method to accurately compute nuclear excitation spectra from correlated ground states, demonstrated on strontium and zirconium isotopes with experimental agreement.

Contribution

The paper presents a novel Monte Carlo Shell Model extension that calculates excitation spectra directly from correlated ground states, improving nuclear structure predictions.

Findings

Accurately reproduces E1 excitation spectra for 88Sr.

Calculates photoabsorption cross sections consistent with experimental data.

Shows applicability to other isotopes like 90Sr and 90,93Zr.

Abstract

A novel approach to obtain the excitation spectrum of nuclei is presented as well as its proof-of-principle. The Monte Carlo Shell Model is extended so that the excitation spectrum can be calculated from its ground state with full of correlations. This new methodology is sketched with the example of E1 excitations from the nucleus 88Sr in comparison to experiment. From the B(E1; 0+1 -> 1- ) value, the photoabsorption cross section is calculated, with the Giant Dipole and Pygmy Dipole Resonances in agreement with experiment. Applications to 90Sr and 90,93Zr are shown with similar characteristics. The possible relevance to the transmutation of long-lived fission products is discussed