Effects of the magnetic field on the spallation reaction implemented by BUU coupled with a phase-space coalescence afterburner

TL;DR

This study investigates how strong magnetic fields influence spallation reactions of proton-gold collisions at 800 MeV/nucleon using a BUU model with a coalescence afterburner, revealing magnetic effects on fragment yields and neutron-proton ratios.

Contribution

It introduces the application of magnetic field effects within a BUU model framework to analyze spallation reactions, highlighting their impact on fragment production and nucleon ratios.

Findings

Magnetic fields significantly alter the neutron-proton ratio of free nucleons.

Magnetic fields have a greater impact on heavier fragment production than on their n/p ratios.

Test particle number minimally affects n/p ratios but influences yields.

Abstract

Based on the Boltzmann-Uehling-Uhlenbeck (BUU) transport model coupled with a phase-space coalescence afterburner, spallation reaction of $p+^{197}Au$ at the incident beam energy of E$_{beam}$= 800 MeV/nucleon is studied. We find that the number of test particles per nucleon has minor effects on the neutron to proton ratio (n/p) of the produced heavier fragments while it affects much on their yields. The external strong magnetic field affects the production of heavier fragments much than the n/p of produced fragments. The n/p of free nucleons is greatly affected by the strong magnetic field, especially for the nucleons with lower energies.