Charge correlations and transverse momenta observed in multifragmentation of 1 GeV/nucleon Au projectiles

Journal Article · Tue Feb 01 00:00:00 EST 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.49.901· OSTI ID:5225726

Rusch, G; Heinrich, W; Wiegel, B; Winkel, E; Dreute, J ^[1]

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1. Fachbereich Physik, Universitaet-GH-Siegen, D-57068 Siegen (Germany)

We have investigated the fragmentation of [sup 197]Au projectiles at 0.85 to 1 GeV/nucleon in collisions with targets (CH[sub 2])[sub [ital n]], C, and Pb. Using plastic nuclear track detectors all projectile fragments with charge 6[le][ital Z][sub [ital F]][le]77 produced in a collision were observed in coincidence. The combination of C and (CH[sub 2])[sub [ital n]] data allows us to extract the hydrogen component in measured distributions by the use of the statistical subtraction method. Our data show a target dependence of the multifragmentation process which indicates a nonequilibrated source of the fragments and/or the influence of the target nucleus on the relation between size and excitation energy of the spectator. In comparison to the prediction of the statistical model, the transverse momentum dispersions are enhanced with a dominant contribution by Coulomb repulsion between the fragments. Based on the sum of transverse momentum vectors of all fragments we conclude that multifragmentation is observed in collisions with a large momentum and energy transfer to the prefragment. Correlations in the azimuthal emission angles of the fragments are caused by mutual repulsion and momentum conservation. The idea that a liquid-gas phase transition of nuclear matter is the origin of multifragmentation is supported by our observations.

• OSTI ID: 5225726
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 49:2; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CARBON 12 TARGET
GOLD 197 REACTIONS
SPALLATION
HYDROGEN 1 TARGET
LEAD 208 TARGET
CHARGES
CORRELATIONS
ENERGY TRANSFER
RELATIVISTIC RANGE
SPALLATION FRAGMENTS
TRANSVERSE MOMENTUM
CHARGED-PARTICLE REACTIONS
ENERGY RANGE
HEAVY ION REACTIONS
LINEAR MOMENTUM
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
TARGETS
663450* - Heavy-Ion-Induced Reactions & Scattering- (1992-)
663430 - Nucleon-Induced Reactions & Scattering- (1992-)
663520 - Nuclear Mass Ranges- A=6-19- (1992-)
663580 - Nuclear Mass Ranges- A=190-219- (1992-)