# Merging ab initio theory and few-body approach for $(d,p)$ reactions

## TL;DR

This paper introduces a new microscopic framework for $(d,p)$ reactions by integrating ab initio nuclear structure calculations with few-body reaction models, enabling more accurate predictions of reaction cross sections.

## Contribution

It merges microscopic nucleon-target properties with three-body reaction formalism, providing a consistent link between structure and reactions in a novel way.

## Key findings

- Excellent agreement with data for $^{40,48}$Ca targets.
- Predictions for $(d,p)$ reactions on neutron-rich $^{52,54}$Ca.
- Relevance to testing new magic numbers $N=32,34$ at FRIB.

## Abstract

A new framework for $A(d,p)B$ reactions is introduced by merging the microscopic approach to computing the properties of the nucleon-target systems and the three-body $n+p+A$ reaction formalism, thus providing a consistent link between the reaction cross sections and the underlying microscopic structure. In this first step toward a full microscopic description, we focus on the inclusion of the neutron-target microscopic properties. The properties of the neutron-target subsystem are encapsulated in the Green's function which is computed with the Coupled Cluster theory using a chiral nucleon-nucleon and three-nucleon interactions. Subsequently, this many-body information is introduced in the few-body Green's Function Transfer approach to $(d,p)$ reactions. Our benchmarks on stable targets $^{40,48}$Ca show an excellent agreement with the data. We then proceed to make specific predictions for $(d,p)$ on neutron rich $^{52,54}$Ca isotopes. These predictions are directly relevant to testing the new magic numbers $N=32,34$ and are expected to be feasible in the first campaign of the projected FRIB facility.