Abstract
It is well known that intranuclear-cascade models generally overestimate the cross sections for one-proton removal from heavy, stable nuclei by a high-energy proton beam, but they yield reasonable predictions for one-neutron removal from the same nuclei and for one- nucleon removal from light targets. We use simple shell-model calculations to investigate the reasons of this deficiency. We find that a correct description of the neutron skin and of the energy density in the nuclear surface is crucial for the aforementioned observables. Neither ingredient is sufficient if taken separately.
Highlights
Nuclear reactions between high-energy ( 150 MeV) nucleons or hadrons and nuclei are usually described by means of intranuclear-cascade (INC) models [1]
It was realized some time ago that INC models systematically fail to describe inclusive cross sections for the removals of few nucleons [see e.g. 2, 3]. This is especially surprising in view of the fact that these observables are associated with peripheral reactions and mostly involve collisions between quasi-free nucleons; one would expect intranuclear cascade to provide an accurate description of this particular dynamics
We will show that the predictions of an INC model [4] can be substantially improved by casting the shell-model calculation results in a form adaptable to the nuclear model underlying INC
Summary
Nuclear reactions between high-energy ( 150 MeV) nucleons or hadrons and nuclei are usually described by means of intranuclear-cascade (INC) models [1]. It was realized some time ago that INC models systematically fail to describe inclusive cross sections for the removals of few nucleons [see e.g. 2, 3] This is especially surprising in view of the fact that these observables are associated with peripheral reactions and mostly involve collisions between quasi-free nucleons; one would expect intranuclear cascade to provide an accurate description of this particular dynamics. This puzzling result has been known for many years but no convincing explanation has ever been put forward. We will show that the predictions of an INC model [4] can be substantially improved by casting the shell-model calculation results in a form adaptable to the nuclear model underlying INC
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