Zero- and finite-temperature electromagnetic strength distributions in closed- and open-shell nuclei from first principles

TL;DR

This paper introduces an efficient ab initio method for calculating electromagnetic response functions at zero and finite temperatures in various nuclei, enabling systematic studies of nuclear responses to electroweak probes.

Contribution

It presents a new computational approach to evaluate electromagnetic strength distributions in nuclei from first principles, including superfluid and deformed nuclei.

Findings

Applied to $^{16}$O, $^{28}$Si, $^{46}$Ti, and $^{56}$Fe.

Demonstrated feasibility of ab initio calculations of nuclear responses.

Paved the way for systematic studies across the nuclear chart.

Abstract

Ab initio approaches to the nuclear many-body problem have seen their reach considerably extended over the past decade. However, collective excitations have been scarcely addressed so far due to the prohibitive cost of solving the corresponding equations of motion. Here, a numerically efficient method to compute electromagnetic response functions at zero- and finite-temperature in superfluid and deformed nuclei from an ab initio standpoint is presented and applied to $^{16}$O, $^{28}$Si, $^{46}$Ti and $^{56}$Fe. This work opens the path to systematic ab initio calculations of nuclear responses to electroweak probes across a significant portion of the nuclear chart.