Properties of the Initial Participant Matter Interaction Zone in Near Fermi-Energy Heavy Ion Collisions
/ Authors
J. Wang, T. Keutgen, R. Wada, K. Hagel, S. Kowalski, T. Materna, L. Qin, Z. Chen, J. Natowitz, Y. Ma
and 27 more authors
M. Murray, A. Keksis, E. Martin, A. Ruangma, D. Shetty, G. Souliotis, M. Veselský, E. Winchester, S. Yennello, D. Fabris, M. Lunardon, S. Moretto, G. Nebbia, S. Pesente, V. Rizzi, G. Viesti, M. Cinausero, G. Prete, J. Cibor, W. Zipper, Z. Majka, P. Staszel, Y. Masri, R. Alfarro, A. Martínez-Dávalos, A. Menchaca-Rocha, A. Ono
/ Abstract
The sizes, temperatures, and free neutron-to-proton ratios of the initial interaction zones produced in the collisions of 40 MeV/nucleon {sup 40}Ar+{sup 112}Sn and 55 MeV/nucleon {sup 27}Al+{sup 124}Sn are derived using total detected neutron plus charged particle multiplicity as a measure of the impact parameter range and number of participant nucleons. The size of the initial interaction zone, determined from a coalescence model analysis, increases significantly with decreasing impact parameter. The temperatures and free neutron-to-proton ratios in the interaction zones are relatively similar for different impact parameter ranges and evolve in a similar fashion.
Journal: Physical Review C