# Perey-effect in Continuum-Discretized Coupled-Channel description of $(d,p)$ reactions

## TL;DR

This paper introduces a novel method to incorporate the Perey-effect, accounting for nonlocal interactions, into continuum-discretized coupled-channel (CDCC) calculations of $(d,p)$ reactions, advancing three-body nuclear reaction modeling.

## Contribution

It presents the first implementation of Perey-effect corrections within CDCC calculations for $(d,p)$ reactions, improving the treatment of nonlocal nucleon-target interactions.

## Key findings

- Perey factors effectively incorporate nonlocality in three-body channels.
- First CDCC calculations including the Perey-effect demonstrate improved reaction modeling.
- The method enhances the accuracy of nuclear reaction predictions involving deuterons.

## Abstract

The Perey-effect in two-body channels of $(d,p)$ reactions has been known for a long time. It arises when the nonlocal two-body deuteron-target and/or proton-target problem is approximated by a local one, manifesting itself in a reduction of the scattering channel wave functions in the nuclear interior. However, the $(d,p)$ reaction mechanism requires explicit accounting for three-body dynamics involving the target and the neutron and proton in the deuteron. Treating nonlocality of the nucleon-target interactions within a three-body context requires significant effort and demands going beyond the widely-used adiabatic approximation, which can be done using a continuum-discretized coupled-channel (CDCC) method. However, the inclusion of nonlocal interactions into the CDCC description of $(d,p)$ reactions has not been developed yet. Here, we point out that, similarly to the two-body nonlocal case, nonlocality in a three-body channel can be accounted for by introducing the Perey factors. We explain this procedure and present the first CDCC calculations to our knowledge including the Perey-effect.