Neutrons from multiplicity-selected La-La and Nb-Nb collisions at 400A MeV and La-La collisions at 250A MeV
- Kent State University, Kent, Ohio 44242 (United States)
- Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
- Michigan State University, East Lansing, Michigan 44828 (United States)
- McGill University, Montreal, Quebec, H3A 2T8 (CANADA)
Triple-differential cross sections for neutrons from high-multiplicity La-La collisions at 250 and 400 MeV per nucleon and Nb-Nb collisions at 400 MeV per nucleon were measured at several polar angles as a function of the azimuthal angle with respect to the reaction plane of the collision. The reaction plane was determined by a transverse-velocity method with the capability of identifying charged-particles with Z=1, Z=2, and Z{gt}2. The flow of neutrons was extracted from the slope at mid-rapidity of the curve of the average in-plane momentum vs the center-of-mass rapidity. The {ital squeeze-out} of the participant neutrons was observed in a direction normal to the reaction plane in the normalized momentum coordinates in the center-of-mass system. Experimental results of the neutron squeeze-out were compared with BUU calculations. The polar-angle dependence of the maximum azimuthal anisotropy ratio r({theta}) was found to be insensitive to the mass of the colliding nuclei and the beam energy. Comparison of the observed polar-angle dependence of the maximum azimuthal anisotropy ratio r({theta}) with BUU calculations for {ital free} neutrons revealed that r({theta}) is insensitive also to the incompressibility modulus in the nuclear equation of state. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 289080
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 1 Vol. 59; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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