A non-equilibrium microscopic description of spallation

Napolitani, P. and Colonna, M. (2016) A non-equilibrium microscopic description of spallation. Il nuovo cimento C, 39 (6). pp. 1-7. ISSN 1826-9885

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We investigate the prompt emission of few intermediate-mass fragments in spallation reactions induced by protons and deuterons in the 1GeV 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.

Item Type: Article
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 16 Nov 2020 20:53
Last Modified: 16 Nov 2020 20:53
URI: http://eprints.bice.rm.cnr.it/id/eprint/19726

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