Disappearance of flow as a probe of the nuclear equation of state

Journal Article · Thu Oct 01 04:00:00 EDT 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.46.1416· OSTI ID:6948436

Krofcheck, D; Bauer, W; Crawley, G M; Howden, S; Ogilvie, C A; Vander Molen, A; Westfall, G D; Wilson, W K ^[1]; Tickle, R S ^[2]; Djalali, C ^[3]; Gale, C ^[4]

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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 Physics, University of Michigan, Ann Arbor, Michigan 48109 (United States)
3. Department of Physics, University of South Carolina, Columbia, South Carolina 29208 (United States)
4. Department of Physics, McGill University, Montreal, Quebec, H3A2T8 (Canada)

The disappearance of directed, collective nuclear motion ( flow'') away from the interaction region of heavy-ion collisions has been observed using the Lawrence Berkeley Laboratory Streamer Chamber. We find that flow vanishes at a beam energy near 50 MeV/nucleon for the {sup 139}La+{sup 139}La system and near 60 MeV/nucleon for the {sup 93}Nb+{sup 93}Nb system. The disappearance of flow may be understood as resulting from a balance between attractive and repulsive scattering strengths. Full calculations with the Boltzmann-Uehling-Uhlenbeck model show that the disappearance of flow is sensitive to the assumed nuclear equation of state (EOS) and to the in-medium scattering cross section ({sigma}{sub {ital N}{ital N}}). Also, in the {sup 93}Nb+{sup 93}Nb system, the purely attractive contribution to the reduced flow does not appear to be strongly sensitive to the EOS assumptions.

• OSTI ID: 6948436
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 46:4; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663560 -- Nuclear Mass Ranges-- A=90-149-- (1992-)
663580 -- Nuclear Mass Ranges-- A=190-219-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGED-PARTICLE REACTIONS
COLLECTIVE EXCITATIONS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EQUATIONS
EQUATIONS OF STATE
EXCITATION
GEV RANGE
GEV RANGE 01-10
HEAVY ION REACTIONS
LANTHANUM 139 REACTIONS
LANTHANUM 139 TARGET
MATTER
NIOBIUM 93 REACTIONS
NIOBIUM 93 TARGET
NUCLEAR MATTER
NUCLEAR REACTIONS
TARGETS