Mass dependence of critical behavior in nucleus-nucleus collisions

Journal Article · Tue Mar 01 00:00:00 EST 1994 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.49.1630· OSTI ID:142684

Li, T; Bauer, W; Craig, D; Gualtieri, E; Hannuschke, S; Pak, R; Vander Molen, A M; Westfall, G D; Winfield, J S; Yee, J; Yennello, S J ^[1]; Lacey, R ^[2]; Nadasen, A ^[3]; Tickle, R S ^[4]; Norbeck, E ^[5]

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1. National Superconducting Cyclotron Laboratory and Department of Physics Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States)
2. Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794 (United States)
3. Department of Physics, University of Michigan at Dearborn, Dearborn, Michigan 48128 (United States)
4. Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (United States)
5. Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242 (United States)

The {ital Z} distributions of fragments emitted from central collisions of {sup 40}Ar+{sup 45}Sc at beam energies from 15 to 115 MeV/nucleon have been fitted to power laws {sigma}({ital Z}){proportional_to}{ital Z}{sup {minus}{lambda}}. The {lambda} parameter reaches a minimum at a beam energy of 23.9{plus_minus}0.7 MeV/nucleon. A percolation model calculation reproduces the observed {ital Z} distributions for all beam energies, using the mean excitation energy as extracted from proton kinetic energy spectra. We extract the critical value of the deposited excitation energy for our system and make predictions for the dependence of this quantity on the size of the fragmenting system.

• OSTI ID: 142684
• Journal Information: Physical Review, C, Vol. 49, Issue 3; Other Information: PBD: Mar 1994
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
SCANDIUM 45 TARGET
ARGON 40 REACTIONS
MASS
MEV RANGE 100-1000
GEV RANGE 01-10
COMPOUND-NUCLEUS REACTIONS
EXCITATION
ENERGY SPECTRA
NUCLEAR FRAGMENTS