Neutron-to-proton ratio in intermediate-energy nuclear reactions

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.52.947· OSTI ID:112956

Pshenichnov, I A; Iljinov, A S; Golubeva, Y S ^[1]; Polster, D ^[2]

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1. Institute for Nuclear Research, Russian Academy of Sciences, 117312 Moscow (Russian Federation)
2. Hahn-Meitner-Institut Berlin, D-14091 Berlin (Germany)

The ratio of inclusive spectra of neutrons and protons in antiproton-, pion-, and proton-nucleus interactions at intermediate energies has been considered in the framework of the intranuclear cascade (INC) model. The ratio predicted by the standard INC model is consistent with the experimental data for pion- and proton-induced reactions, but contradicts the ratio obtained in antiproton-nucleus annihilation measurements. It has been shown that for pion-nucleus interactions the {ital n}/{ital p} ratio is much affected by isotopic effects in pion absorption and mainly depends on pion charge. Nevertheless, due to the presence of positive, negative, and neutral pions in antiproton-nucleon annihilation the calculated {ital n}/{ital p} ratio becomes close to the {ital N}/{ital Z} ratio of the target nucleus. The coalescence of nucleons, preequilibrium emission of particles, interaction of annihilation pions with the nuclear Coulomb field, neutron halo effects, and many body annihilation have been considered as possible candidates which would affect the {ital n}/{ital p} ratio in antiproton-nucleus annihilation. A simple quark counting estimation for the {ital n}/{ital p} ratio in many body annihilation has been made.

• OSTI ID: 112956
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 2 Vol. 52; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANNIHILATION
ANTIPROTON REACTIONS
COULOMB FIELD
NEUTRON SPECTRA
NUCLEAR CASCADES
NUCLEAR REACTIONS
PION REACTIONS
PROTON SPECTRA