A non-equilibrium microscopic description of spallation
Abstract
We investigate the prompt emission of few intermediate-mass fragments in spallation reactions induced by protons and deuterons in the 1 GeV range. Such emission has a minor contribution to the total reaction cross section, but it may overcome evaporation and fission channels in the formation of light nuclides. The role of mean-field dynamics and phase-space fluctuations in these reactions is investigated through the Boltzmann-Langevin transport equation. We found that a process of frustrated fragmentation and re-aggregation is a prominent mechanism of production of IMFs which can not be assimilated to the statistical decay of a compound nucleus. Very interestingly, this process may yield a small number of IMF in the exit channel, which may even reduce to two, and be wrongly confused with ordinary asymmetric fission. This interpretation, inspired by nuclear-spallation experiments, can be generalised to heavy-ion collisions approaching the fragmentation threshold.
Cite
@article{arxiv.1610.00627,
title = {A non-equilibrium microscopic description of spallation},
author = {P. Napolitani and M. Colonna},
journal= {arXiv preprint arXiv:1610.00627},
year = {2017}
}
Comments
Conf. proc. IWM-EC, 9-12 May 2016, Caen, France