Disappearance of flow in heavy-ion collisions

Journal Article · Mon Nov 06 00:00:00 EST 1989 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.63.2028· OSTI ID:5148394

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

---

1. National Superconducting Cyclotron Laboratory and Department of Physics Astronomy, Michigan State University, East Lansing, Michigan 48824-1321 (USA)
2. Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (USA)
3. Theoretical Physics Branch, Chalk River Nuclear Laboratories, Chalk River, Ontario, Canada K0J 1J0 (USA)

We report the first observation of the disappearance of flow in heavy-ion collisions. This is accomplished by measuring the excitation function of the average in-plane transverse momentum for the symmetric system {sup 139}La+{sup 139}La, using beam energies of 130, 70, and 50 MeV/nucleon. The observation is indicative of a change from dominantly repulsive to attractive scattering. We also present the results of calculations performed with the Boltzmann-Uehling-Uhlenbeck equation which support the concept of vanishing flow for this system in the energy region between 30 and 50 MeV/nucleon.

• OSTI ID: 5148394
• Journal Information: Physical Review Letters; (USA), Vol. 63:19; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
HEAVY ION REACTIONS
FLOW MODELS
LANTHANUM 139 REACTIONS
LANTHANUM 139 TARGET
EXPERIMENTAL DATA
GEV RANGE 10-100
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
PARTICLE RAPIDITY
TRANSPORT THEORY
TRANSVERSE MOMENTUM
CHARGED-PARTICLE REACTIONS
DATA
ENERGY RANGE
GEV RANGE
INFORMATION
LINEAR MOMENTUM
MATHEMATICAL MODELS
NUMERICAL DATA
PARTICLE PROPERTIES
POTENTIALS
TARGETS
653003* - Nuclear Theory- Nuclear Reactions & Scattering