Implications for (d,p) reaction theory from nonlocal dispersive optical model analysis of $^{40}$Ca(d,p)$^{41}$Ca

TL;DR

This study applies nonlocal dispersive optical model potentials to analyze (d,p) reactions, revealing that current models overestimate cross sections and suggesting the need for incorporating many-body effects for accuracy.

Contribution

First use of NLDOM potentials in (d,p) reaction analysis, highlighting limitations and the necessity of including many-body physics in reaction models.

Findings

NLDOM predicts 70% higher cross sections than experimental data.

Overestimation likely due to insufficient absorption or wave interference.

Current models lack certain many-body physics effects.

Abstract

The nonlocal dispersive optical model (NLDOM) nucleon potentials are used for the first time in the adiabatic analysis of a (d,p) reaction to generate distorted waves both in the entrance and exit channels. These potentials were designed and fitted by Mahzoon $et \text{ } al.$ [Phys. Rev. Lett. 112, 162502 (2014)] to constrain relevant single-particle physics in a consistent way by imposing the fundamental properties, such as nonlocality, energy-dependence and dispersive relations, that follow from the complex nature of nuclei. However, the NLDOM prediction for the $^{40}$Ca(d,p)$^{41}$Ca cross sections at low energy, typical for some modern radioactive beam ISOL facilities, is about 70$\%$ higher than the experimental data despite being reduced by the NLDOM spectroscopic factor of 0.73. This overestimation comes most likely either from insufficient absorption or due to constructive interference between ingoing and outgoing waves. This indicates strongly that additional physics arising from many-body effects is missing in the widely used current versions of (d,p) reaction theories.