Speaker
Prof.
Sara Pirrone
(INFN Catania - Italy)
Description
The experiment, named ISODEC, was performed in order to study the de-excitation of medium mass nuclei formed by fusion processes, and to explore the isospin dependence of their decay modes. The nuclei 118,134Ba, produced by bombarding 40,48Ca targets with stable beams of 78,86Kr at 10 AMeV, present a large variation of N/Z, high angular momentum, and similar excitation energy. Indeed, the neutron enrichment of the compound nuclei is expected to play an important role on the various emission mechanisms, providing crucial information on fundamental nuclear quantities such as level density, fission barrier or viscosity, symmetry energy. This experiment, named ISODEC, that complements the results of previous experiment realized at GANIL with INDRA detector, was performed at INFN-LNS with the 4π multidetector for charged particle CHIMERA. For the first time this array was used to work at bombarding energy as low as 10AMeV, thanks to a suitable the Pulse Shape Discrimination method, for charge identification, applied in the Si detectors. This method, combined with the TOF and ΔE-E techniques, provides a complete discrimination in charge and mass of the main reaction products. Preliminary results show a different isotopic composition and relative enrichment for the same Z in the two systems. The yields of the Intermediate Mass Fragments (IMF, 3<Z<12) exhibits a strong even-odd staggering, that is more pronounced for the n-poor system. The evaluation of the absolute cross sections, that will provide important indications on the isospin influence on the reaction mechanism, is in progress, as well as comparisons with theoretical models for formation and decay of compound systems (GEMINI, GEMINI++, DNS).
Primary author
Prof.
Sara Pirrone
(INFN Catania - Italy)
Co-authors
Prof.
A. Chbihi
(GANIL - Caen - France)
Prof.
Angelo Pagano
(INFN - Catania - Italy)
Prof.
Antonio D'Onofrio
(University and INFN - Napoli - Italy)
Dr
Antonio Trifirò
(University and INFN - Messina - Italy)
Prof.
Bernard Borderie
(IN2P3 - IPN Orsay - France)
Prof.
Christian Beck
(IN2P3 - IPHC Strasbourg - France)
Dr
D. Lebhertz
(GANIL - Caen - France)
Dr
Domenico Loria
(University and INFN - Messina - Italy)
Dr
Elena Geraci
(University and INFN - Catania - Italy)
Dr
Elena La guidara
(INFN and CSFNSM - Catania - Italy)
Prof.
Elio Rosato
(University and INFN - Napoli - Italy)
Prof.
Enrico De Filippo
(INFN - Catania - Italy)
Dr
Eric Bonnet
(GANIL - Caen - France)
Dr
Eric Henry
(University of Rochester - USA)
Prof.
Eric Piasecki
(University of Warsaw - Poland)
Dr
Francesca Amorini
(INFN - LNS - Catania - Italy)
Prof.
Francesca Rizzo
(University and INFN - LNS - Catania - Italy)
Prof.
Francesco porto
(University and INFN - LNS - Catania - Italy)
Prof.
G. Spadaccini
(University and INFN - Napoli - Italy)
Dr
Gaetano Lanzalone
(University of Enna and INFN - Catania - Italy)
Prof.
Giuseppe Cardella
(INFN - Catania - Italy)
Prof.
Giuseppe Politi
(University and INFN - Catania - Italy)
Dr
Giuseppe Verde
(INFN - Catania - Italy)
Dr
Guilan Ademard
(GANIL - Caen - France)
Dr
Ionela Berceanu
(IPNE - Bucharest - Romania)
Dr
Ivano Lombardo
(University and INFN - LNS - Catania - Italy)
Prof.
Jan Toke
(University of Rochester - USA)
Prof.
Jean Pierre Wieleczko
(GANIL - Caen - France)
Prof.
John D. Frankland
(GANIL - Caen - France)
Dr
K. Mazurek
(GANIL - Caen - France)
Dr
Letizia Auditore
(University and INFN - Messina - Italy)
Dr
Marco La Commara
(University and INFN - Napoli - Italy)
Prof.
Maria Colonna
(INFN - LNS - Catania - Italy)
Prof.
Mariano Vigilante
(University and INFN - Napoli - Italy)
Dr
Marina Trimarchi
(University and INFN - Messina - Italy)
Prof.
Massimo Papa
(INFN - Catania - Italy)
Dr
Mike Quinlann
(University of Rochester - USA)
Dr
Nicolas Le Neindre
(IN2P3 - LPC Caen - France)
Dr
Paolo Russotto
(University and INFN - LNS - Catania - Italy)
Dr
Philippe Lautesse
(IN2P3 - IPN Lyon - France)
Prof.
W. Udo Schroeder
(University of Rochester - USA)
