Charged-particles in coincidence with fission fragments (FF) and evaporation residues (ER) have been measured for the system 180-MeV 32 + 109Ag leading to the composite system 141Eu at the excitation energy Ex=90 MeV. Energy spectra and multiplicities in both channels have been compared to the predictions of the statistical model by using the code PACE2. The same multiplicity analysis has been employed in the system 905-MeV 121Sb + 27Al. For both reactions, it was not possible to find a unique set of input parameters which could result in a simultaneous fit of the multiplicities in both channels. A time delay was still necessary in both systems to reproduce the respective pre-scission multiplicities and fission cross-section alone. Charged particle multiplicities in the ER channel are largely overestimated by the model in both reactions and implications of this finding on the extraction of the fission timescale are briefly discussed.
Proton and alpha particle emission in the fission and evaporation residue channels from nuclei with A≈140 / Vardaci, Emanuele; LA RANA, Giovanni; Brondi, Augusto; A. A., Di Meo; Moro, RENATA EMILIA MARIA; A., Principe; D., Fabris; G., Nebbia; G., Viesti; G., Prete. - STAMPA. - DYNAMICAL ASPECTS OF NUCLEAR FISSION:(2000), pp. 261-272. (Intervento presentato al convegno 4th International Conference on Dynamical Aspects of Nuclear Fission tenutosi a Castá-Papiernicka, Slovak Republic nel 19 – 23 Ottobre 1998).
Proton and alpha particle emission in the fission and evaporation residue channels from nuclei with A≈140.
VARDACI, EMANUELE;LA RANA, GIOVANNI;BRONDI, AUGUSTO;MORO, RENATA EMILIA MARIA;
2000
Abstract
Charged-particles in coincidence with fission fragments (FF) and evaporation residues (ER) have been measured for the system 180-MeV 32 + 109Ag leading to the composite system 141Eu at the excitation energy Ex=90 MeV. Energy spectra and multiplicities in both channels have been compared to the predictions of the statistical model by using the code PACE2. The same multiplicity analysis has been employed in the system 905-MeV 121Sb + 27Al. For both reactions, it was not possible to find a unique set of input parameters which could result in a simultaneous fit of the multiplicities in both channels. A time delay was still necessary in both systems to reproduce the respective pre-scission multiplicities and fission cross-section alone. Charged particle multiplicities in the ER channel are largely overestimated by the model in both reactions and implications of this finding on the extraction of the fission timescale are briefly discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
