Mass and charge distributions for the reactionCa40+Bi209at 600 MeV
| Autor: | Alice Mignerey, D. E. Russ, E. J. Garcia-Solis, Dan Shapira, H. Madani, A.A. Marchetti |
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| Rok vydání: | 1995 |
| Předmět: | |
| Zdroj: | Physical Review C. 52:3114-3125 |
| ISSN: | 1089-490X 0556-2813 |
| DOI: | 10.1103/physrevc.52.3114 |
| Popis: | The charge and mass of the projectile-like fragments produced in the 15-MeV per nucleon {sup 40}Ca+{sup 209}Bi reaction were determined for products detected near the grazing angle. Neutron number-charge ({ital N}{minus}{ital Z}) distributions were generated as a function of the total kinetic energy loss and parametrized by their centroids, variances, and correlation coefficients. Although the initial system is very asymmetric, after the interaction, a drift of the charge and mass centroids toward further asymmetry is observed. The production of projectile-like fragments is consistent with a tendency of the projectile-like fragments to retain the projectile neutron-to-proton ratio {l_angle}{ital N}{r_angle}/{l_angle}{ital Z}{r_angle}{congruent}1. The correlation coefficient remains well below 1.0 for the entire range of total kinetic energy lost. Predictions of two nucleon exchange models, Randrup`s and Tassan-Got`s, are compared to the experimental results. The models are not able to reproduce the evolution of the experimental distributions, especially the fact that the variances reach a maximum and then decrease as function of the energy loss. This behavior supports the hypothesis that some form of projectile-like fragmentation or cluster emission is perturbing the product distribution from that expected from a damped mechanism. |
| Databáze: | OpenAIRE |
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