Partitions in nuclear fragmentation

Eric Bonnet (1, 2) , B. Borderie (2) , N. Le Neindre (2, 3) , M.F. Rivet (2) , R. Bougault (3) , A. Chbihi (1) , J.D. Frankland (1) , E. Galichet (2, 4) , F. Gagnon-Moisan (2, 5) , D. Guinet (6) , P. Lautesse (6) , J. Lukasik (7) , P. Marini (1, 2) , M. Pârlog (3) , E. Rosato (8) , R. Roy (5) , G. Spadaccini (8) , M. Vigilante (8) , J.P. Wieleczko (1) , B. Zwieglinski (9)

1 GANIL - Grand Accélérateur National d'Ions Lourds
2 IPNO - Institut de Physique Nucléaire d'Orsay
3 LPCC - Laboratoire de physique corpusculaire de Caen
4 CNAM Paris - Centre d'enseignement Cnam Paris
5 Laboratoire de Physique Nucléaire
6 IPNL - Institut de Physique Nucléaire de Lyon
7 IFJ-PAN - Institute of Nuclear Physics
8 Dipartimento di Scienze Fisiche e Sezione INFN
9 The Andrzej Soltan Institute for Nuclear Studies

Fragment partitions of fragmenting hot nuclei produced in central and semiperipheral collisions have been compared in the excitation energy region where radial collective expansion takes place. It is shown that, for a given total excitation energy per nucleon, the intensity of the radial collective energy fixes the degree of fragmentation (mean fragment multiplicity). It is also shown that the partitions, at a given total excitation energy per nucleon, are completely determined by the reduced fragment multiplicities (fragment multiplicities normalized to source size). Such observations emphasize the subtle role played by the radial collective expansion. They also represent a benchmark against which models describing the fragmentation process of finite systems should be tested.

Mots clés: fragmentation; central and peripheral collisions; fragment charge partition; scaling; finite system

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

Eric Bonnet, B. Borderie, N. Le Neindre, M.F. Rivet, R. Bougault, et al.. Partitions in nuclear fragmentation. 2010. ⟨hal-00454499v1⟩