Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
1995-10-03
Phys.Rev.C52:2643-2651,1995
Physics
Nuclear Physics
Nuclear Experiment
20 LaTeX pages. 11 figures to be faxed on request, send email to sender's address
Scientific paper
10.1103/PhysRevC.52.2643
We measured neutron triple-differential cross sections from multiplicity-selected Au-Au collisions at 150, 250, 400, and 650 \AMeV. The reaction plane for each collision was estimated from the summed transverse velocity vector of the charged fragments emitted in the collision. We examined the azimuthal distribution of the triple-differential cross sections as a function of the polar angle and the neutron rapidity. We extracted the average in--plane transverse momentum $\langle P_x\rangle$ and the normalized observable $\langle P_x/P_\perp\rangle$, where $P_\perp$ is the neutron transverse momentum, as a function of the neutron center-of-mass rapidity, and we examined the dependence of these observables on beam energy. These collective flow observables for neutrons, which are consistent with those of protons plus bound nucleons from the Plastic Ball Group, agree with the Boltzmann--Uehling--Uhlenbeck (BUU) calculations with a momentum--dependent interaction. Also, we calculated the polar-angle-integrated maximum azimuthal anisotropy ratio R from the value of $\langle P_x/P_\perp\rangle$.
Anderson Brian Do
Baldwin A. R.
Elaasar M.
Gale Charles
Keane Dan
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