Light particle emission induced by stopped antiprotons in nuclei: Energy dissipation and neutron-to-proton ratio

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.51.1167· OSTI ID:6474663

Polster, D; Hilscher, D; Rossner, H ^[1]; von Egidy, T; Hartmann, F J; Hoffmann, J; Schmid, W ^[2]; Pshenichnov, I A; Iljinov, A S; Golubeva, Y S ^[3]; Machner, H ^[4]; Plendl, H S ^[5]; Grochulska, A; Jastrzebski, J; Kurcewicz, W; Lubinski, P ^[6]; Eades, J; Neumaier, S ^[7]

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1. Hahn-Meitner-Institut Berlin, D-14091 Berlin (Germany)
2. Physik Department, Technische Universitaet Muenchen, D-85748 Garching (Germany)
3. Institute for Nuclear Research, Russian Academy of Sciences, 117312 Moscow (Russian Federation)
4. Forschungszentrum Juelich, D-52405 Juelich (Germany)
5. Florida State University, Tallahassee, Florida 32306 (United States)
6. Warsaw University, PL-02-097 Warszawa (Poland)
7. CERN, CH-1211 Geneve 23 (Switzerland)

Simultaneous measurements of inclusive energy spectra and multiplicities of [pi][sup [plus minus]], [ital K][sup [plus minus]], [ital n], [ital p], [ital d], and [ital t] following antiproton annihilation on nuclei over a wide energy range and in the case of neutrons down to the evaporative part of the spectra are reported. Thirteen targets in the mass range of [ital A]=12--238 were used in a target mass dependent investigation of the fast stage of the antiproton-nucleus interaction. The deduced transferred, preequilibrium and equilibrium excitation energies agree very well with the dynamical picture drawn by the intranuclear cascade model (INC). Ratios of directly emitted neutrons to protons have been determined to be about twice the [ital N]/[ital Z] ratio in the target nucleus nearly independently of its mass. These unexpected values for this new sensitive observable are not completely understood in the standard framework of INC. Possible effects of isospin and nucleon densities as well as further schemes beyond the INC are discussed.

• OSTI ID: 6474663
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 51:3; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

662340* -- Hadron Interactions-- (1992-)
663110 -- General & Average Properties of Nuclei & Nuclear Energy Levels-- (1992-)
663300 -- Nuclear Reactions & Scattering
General-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANTINUCLEON REACTIONS
ANTIPROTON REACTIONS
BARYON REACTIONS
BARYONS
BOSONS
CHARGED PARTICLES
DEUTERONS
ELEMENTARY PARTICLES
ENERGY SPECTRA
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
HADRON REACTIONS
HADRONS
ISOSPIN
KAONS
KAONS MINUS
KAONS PLUS
MESONS
MULTIPLICITY
NEUTRONS
NUCLEAR CASCADES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PIONS
PIONS MINUS
PIONS PLUS
PROTONS
PSEUDOSCALAR MESONS
SPECTRA
STRANGE MESONS
STRANGE PARTICLES
TRITONS