1. Observation of fast collinear partitioning of the 197Au + 197Au system into three and four fragments of comparable size
- Author
-
Wilczynski, J., Skwira-Chalot, I., Siwek-Wilczynska, K., Pagano, A., Amorini, F., Anzalone, A., Auditore, L., Baran, V., Brzychczyk, J., Cardella, G., Cavallaro, S., B. Chatterjee, M., Colonna, M., De Filippo, E., Di Toro, M., Gawlikowicz, W., Geraci, 1e., Grzeszczuk, A., Guazzoni, P., Kowalski, S., La Guidara, E., Lanzalone, G., Łukasik, J., Maiolino, C., Majka, Z., G. Nicolis, N., Papa, M., Piasecki, E., Pirrone, S., Płaneta, R., Politi, G., Porto, F., Rizzo, F., Russotto, P., Schmidt, K., Sochocka, A., Swiderski, L., Trifiro, A., Trimarchi, M., Wieleczko, J.P., Zetta, L., Zipper, W., Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
- Subjects
25.70.Lm, 25.70.Mn ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] - Abstract
International audience; Collisions of a very heavy nonfusing nuclear system 197Au + 197Au were studied at an energy of 15MeV/ nucleon. An interesting process of violent reseparation of this heavy system into three or four fragments of comparable size was observed. In the case of ternary partitioning, either the projectile-like fragment (PLF) or target-like fragment (TLF) breaks up almost collinearly with the PLF-TLF separation axis. In the case of quaternary reactions, both PLF and TLF were observed breaking up along this direction. By comparison with a dynamical model of deep inelastic collisions it was concluded that the ternary and quaternary reactions occur in semiperipheral collisions, in a range of angular momenta corresponding to about 0.5–0.7 of the maximum L value for grazing collisions. The time elapsing from the scission of the binary PLF + TLF system to the secondary scission of PLF or TLF was estimated to be of about 70–80 fm/c for the ternary reactions and 80–100 fm/c for the quaternary reactions.
- Published
- 2010
- Full Text
- View/download PDF