Two-stage description of charge distributions in ⁵⁶Fe+p spallation reactions at 0.3-1.5 GeV/A

¹ Department of Physics, The University of Ioannina, Ioannina 45110, Greece
² Laboratory of Physical Chemistry, Department of Chemistry, University of Athens, Athens, Greece
³ Cyclotron Institute, Texas A & M University, College Station, Texas, USA
⁴ Laboratori Nazionali del Sud, INFN, Catania, Italy

^* Corresponding author, email: nnicolis@uoi.gr

Published online: 10 September 2021

Abstract

Spallation reactions are studied in the framework of a two-stage model. The intra-nuclear cascade (INC) stage of the reaction is simulated with the code ISABEL and a Constrained Molecular Dynamics (CoMD) code. The de-excitation of the highly excited pre-fragments is described with the multi-sequential binary decay code MECO, based on a generalized Weisskopf-Ewing formalism. Emission of nucleons, gamma rays and IMFs in their ground, excited bound and unbound states is considered. Calculated cross sections are compared with the experimental charge distributions of ⁵⁶Fe + p spallation reaction products studied at GSI with the fragment separator FRS in the energy-range 0.3 − 1.5 GeV/A. At all bombarding energies, a good description of the experimental data is obtained with ISABEL-MECO using a global set of parameters. A preliminary calculation with CoMD-MECO at 1GeV/A is discussed.