Finite-range effects in (d,p) reactions

TL;DR

This paper assesses the significance of finite-range effects in (d,p) transfer reactions, demonstrating that they are negligible at low energies but become crucial at intermediate energies for accurate data analysis.

Contribution

It provides a comprehensive evaluation of finite-range effects in (d,p) reactions across various targets and energies, emphasizing the need for exact treatment at intermediate energies.

Findings

Finite-range effects are below 10% at low energies.

Effects become significant at 20 MeV/u, requiring precise modeling.

Study covers a wide range of targets and energies.

Abstract

With the increasing interest in using (d,p) transfer reactions to extract structure and astrophysical information, it is important to evaluate the accuracy of common approximations in reaction theory. Starting from the zero-range adiabatic wave model, which takes into account deuteron breakup in the transfer process, we evaluate the importance of the finite range of the n-p interaction in calculating the adiabatic deuteron wave (as in Johnson and Tandy) as well as in evaluating the transfer amplitude. Our study covers a wide variety of targets, as well as a large range of beam energies. Whereas at low beam energies finite-range effects are small (below 10%), we find these effects to become important at intermediate energies (20 MeV/u) calling for an exact treatment of finite range in the analysis of (d,p) reactions measured at fragmentation facilities.