HAL: hal-00335974, version 1

arXiv: 0810.5606

DOI: 10.1016/j.nuclphysa.2008.11.005

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Nuclear Physics A 816, 1-4 (2009) 1-18

Fragment properties of fragmenting heavy nuclei produced in central and semi-peripheral collisions.

Eric Bonnet 1, 2, Bernard Borderie 1, Nicolas Le Neindre 1, 3, Marie-France Rivet 1, R. Bougault 3, A. Chbihi 2, R. Dayras 4, J.D. Frankland 2, E. Galichet 1, 5, F. Gagnon-Moisan 1, D. Guinet 6, P. Lautesse 6, J. Lukasik 7, D. Mercier 3, M. Pârlog 3, E. Rosato 8, R. Roy 9, C. Sfienti 10, M. Vigilante 8, J.P. Wieleczko 2, B. Zwieglinski 2

For the INDRA; ALADIN collaboration(s)

(2009-01-15)

Fragment properties of hot fragmenting sources of similar sizes produced in central and semi-peripheral collisions are compared in the excitation energy range 5-10 AMeV. For semi-peripheral collisions a method for selecting compact quasi-projectiles sources in velocity space similar to those of fused systems (central collisions) is proposed. The two major results are related to collective energy. The weak radial collective energy observed for quasi-projectile sources is shown to originate from thermal pressure only. The larger fragment multiplicity observed for fused systems and their more symmetric fragmentation are related to the extra radial collective energy due to expansion following a compression phase during central collisions. A first attempt to locate where the different sources break in the phase diagram is proposed.

1:	Institut de Physique Nucléaire d'Orsay (IPNO)
	CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud
2:	Grand Accélérateur National d'Ions Lourds (GANIL)
	CNRS : UPR3266 – IN2P3 – CEA : DSM/GANIL
3:	Laboratoire de Physique Corpusculaire de Caen (LPCC)
	CNRS : UMR6534 – IN2P3 – Université de Caen – Ecole Nationale Supérieure d'Ingénieurs de Caen
4:	Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA) (IRFU)
	CEA : DSM/IRFU
5:	Conservatoire National des Arts et Métiers (CNAM Paris)
	Conservatoire National des Arts et Métiers (CNAM)
6:	Institut de Physique Nucléaire de Lyon (IPNL)
	CNRS : UMR5822 – IN2P3 – Université Claude Bernard - Lyon I
7:	Institute of Nuclear Physics (IFJ-PAN)
	Institute of Nuclear Physics
8:	Dipartimento di Scienze Fisiche e Sezione INFN
	INFN – Università degli studi di Napoli Federico II
9:	Laboratoire de Physique Nucléaire
	Université Laval
10:	Gesellschaft für Schwerionenforschung mbH (GSI)
	Gesellschaft für Schwerionenforschung

Subject

:

Physics/Nuclear Experiment

Keyword(s): Intermediate energy heavy-ion reactions – central and semi-peripheral collisions – multifragmentation – fragment partitions – collective energy

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From: Eric Bonnet <>

Submitted on: Friday, 31 October 2008 14:30:28

Updated on: Monday, 5 January 2009 10:04:23