Medium effects in direct reactions

TL;DR

This paper investigates how medium modifications of nucleon-nucleon cross sections affect direct nuclear reactions at intermediate energies, highlighting significant effects especially in reactions with weakly bound nuclei.

Contribution

It compares different models of medium corrections, including geometrical Pauli-blocking and Dirac-Bruecker methods, to assess their impact on reaction calculations.

Findings

Medium corrections can significantly alter reaction outcomes.

Effects are more pronounced with weakly bound nuclei.

Different correction models produce comparable modifications.

Abstract

We discuss medium corrections of the nucleon-nucleon (NN) cross sections and their influence on direct reactions at intermediate energies $\gtrsim 50$ MeV/nucleon. The results obtained with free NN cross sections are compared with those obtained with a geometrical treatment of Pauli-blocking and with NN cross sections obtained with Dirac-Bruecker methods. We show that medium corrections may lead to sizable modifications for collisions at intermediate energies and that they are more pronounced in reactions involving weakly bound nuclei.