Coincidence measurement of residues and light particles in the reaction 56Fe+p at 1 GeV per nucleon with SPALADIN

TL;DR

This study investigates the spallation of iron-56 with hydrogen at 1 GeV per nucleon using coincidence measurements, providing insights into reaction channels and de-excitation processes, and comparing experimental data with theoretical models.

Contribution

It offers detailed experimental data on reaction channels and tests various de-excitation models, highlighting GEMINI's effectiveness in explaining the results for light systems.

Findings

GEMINI model reasonably reproduces the experimental data.

Multifragmentation may not be necessary to explain the observed de-excitation.

De-excitation channels evolve with excitation energy.

Abstract

The spallation of $^{56}$Fe in collisions with hydrogen at 1 A GeV has been studied in inverse kinematics with the large-aperture setup SPALADIN at GSI. Coincidences of residues with low-center-of-mass kinetic energy light particles and fragments have been measured allowing the decomposition of the total reaction cross-section into the different possible de-excitation channels. Detailed information on the evolution of these de-excitation channels with excitation energy has also been obtained. The comparison of the data with predictions of several de-excitation models coupled to the INCL4 intra-nuclear cascade model shows that only GEMINI can reasonably account for the bulk of collected results, indicating that in a light system with no compression and little angular momentum, multifragmentation might not be necessary to explain the data.