Elsevier

Nuclear Physics A

Volume 408, Issue 3, 7 November 1983, Pages 525-558
Nuclear Physics A

Particle production in the target-rapidity region from hadron-nucleus reactions at several GeV

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Abstract

Highly inelastic processes in hadron-nucleus reactions at several GeV have been studied by measuring multi-particle emission in the target-rapidity region. Events with no leading particle(s) but with high multiplicities were observed up to 4 GeV. Proton spectra from such events were well reproduced with a single-moving-source model, which implied possible formation of a local source. The number of nucleons involved in the source was estimated to be (3–5)A13 from the source velocity and the multiplicity of emitted protons. In those processes the incident energy flux seemed to be deposited totally or mostly (>62;75%) in the target nucleus to form the local source. The cross sections for the process were about 30% of the geometrical cross sections, with little dependence on incident energies up to 4 GeV and no dependence on projectiles (pions or protons). The E0 parameter in the invariant-cross-section formula E d3σ/dp3 = A exp (−E/E0) for protons from the source increases with incident energy from 1 to 4 GeV/c, but seems to saturate above 10 GeV at a value E0 = 60–70 MeV. Three components in the emitted nucleon spectra were observed which would correspond to three stages of the reaction process: primary, pre-equilibrium and equilibrium.

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