New “3D calorimetry” of hot nuclei

Abstract

In the domain of Fermi energy, it is extremely complex to isolate experimentally fragments and particles issued from the cooling of a hot nucleus produced during a heavy ion collision. This paper presents a new method to characterize more precisely hot Quasi-Projectiles. It tries to take into account as accurately as possible the distortions generated by all the other potential participants in the nuclear reaction. It is quantitatively shown that this method is a major improvement respect to classic calorimetries used with a 4π detector array. By detailing and deconvolving the different steps of the reconstitution of the hot nucleus, this study shows also the respective role played by the experimental device and the event selection criteria on the quality of the determination of QP characteristics.

Editorial: Nuclear structure and dynamics with stable and unstable beams

“…This complex scenario, occurring in the domain of Fermi energies, can be explored thanks to high-performance multi-detector arrays as, for example, INDRA [45][46][47], CHIMERA [48-50], HiRA [51-53], LASSA [54], FAZIA [55][56][57], often coupled with high angular resolution hodoscopes as FARCOS [58,59] or OSCAR [60] to better sample specific region of the phase space. In this framework, it has been demonstrated the occurrence of spinodal decomposition of the system formed in central heavy-ion collisions at Fermi energies [61] due to mechanical instabilities; furthermore, the highly excited systems formed at different impact parameters can be characterized with thermometric [62] and calorimetric [63,64] measurements that can be useful also to unveil the nature of the phase transition from a liquid-like to a gas-like phase occurring in nuclear matter [65][66][67]. It is also possible that condensation phenomena could influence the yields of the observed light clusters [68].…”