Neutrons from multiplicity-selected La-La and Nb-Nb collisions at 400A MeV and La-La collisions at 250A MeV Academic Article uri icon

abstract

  • 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 [Formula Presented] and [Formula Presented] 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 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 [Formula Presented] 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 [Formula Presented] with BUU calculations for free neutrons revealed that [Formula Presented] is insensitive also to the incompressibility modulus in the nuclear equation of state. 1999 The American Physical Society.

published proceedings

  • PHYSICAL REVIEW C

author list (cited authors)

  • Htun, M. M., Madey, R., Zhang, W. M., Elaasar, M., Keane, D., Anderson, B. D., ... Zhang, J.

citation count

  • 8

complete list of authors

  • Htun, MM||Madey, R||Zhang, WM||Elaasar, M||Keane, D||Anderson, BD||Baldwin, AR||Jiang, J||Scott, A||Shao, Y||Watson, JW||Frankel, K||Heilbronn, L||Krebs, G||McMahan, MA||Rathbun, W||Schambach, J||Westfall, GD||Yennello, S||Gale, C||Zhang, J

publication date

  • January 1999