Elsevier

Nuclear Physics A

Volume 542, Issue 4, 22 June 1992, Pages 699-714
Nuclear Physics A

Proton removal in peripheral nuclear collisions at relativistic energies

https://doi.org/10.1016/0375-9474(92)90264-KGet rights and content

Abstract

The projectile-fragment separator FRS, recently installed at the heavy-ion synchrotron SIS18 at GSI, was used to measure the formation cross sections and longitudinal-momentum distributions of fragments produced by removing one, two or three protons from 0.8 GeV· A 136Xe and 1 GeV · A 197 Au projectiles impinging on targets of beryllium and aluminum, respectively. These data gave direct information on the high-energy nuclear collision with only little contribution from evaporation processes. The measured cross sections decrease by more than one order of magnitude per proton removed. They are well reproduced by the predictions of a statistical abrasion model and an intranuclear-cascade calculation. The momentum distributions are found to be much broader than predicted by empirical systematics. They are, however, in agreement with the momentum distribution of the abraded protons as calculated with the uniform-Fermi-gas model, if Fermi momenta as measured by quasi-elastic electron scattering are used.

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    This article comprises part of the Ph.D. thesis of B. Voss.

    1

    On leave from: Institute of Experimental Physics, Warsaw University, Warsaw, Poland.

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