New scalings in nuclear fragmentation

Eric Bonnet (1, 2) , B. Borderie (2) , N. Le Neindre (2, 3) , Ad.R. Raduta (2, 4) , M.F. Rivet (2) , R. Bougault (3) , A. Chbihi (1) , J.D. Frankland (1) , E. Galichet (2, 5) , F. Gagnon-Moisan (2, 6) , D. Guinet (7) , P. Lautesse (7) , J. Lukasik (8) , P. Marini (1, 2) , M. Pârlog (3) , E. Rosato (9) , R. Roy (6) , G. Spadaccini (9) , M. Vigilante (9) , J.P. Wieleczko (1) , B. Zwieglinski (10)

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 NIPNE - National Institute for Physics and Nuclear Engineering
5 CNAM - Conservatoire National des Arts et Métiers [CNAM]
6 Laboratoire de Physique Nucléaire
7 IPNL - Institut de Physique Nucléaire de Lyon
8 IFJ-PAN - Institute of Nuclear Physics
9 Dipartimento di Scienze Fisiche e Sezione INFN
10 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 4-10 MeV per nucleon where radial collective expansion takes place. It is shown that, for a given total excitation energy per nucleon, the amount of radial collective energy fixes the mean fragment multiplicity. It is also shown that, at a given total excitation energy per nucleon, the different properties of fragment partitions are completely determined by the reduced fragment multiplicity (fragment multiplicity normalized to the source size). Freeze-out volumes seem to play a role in the scalings observed.

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

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

Eric Bonnet, B. Borderie, N. Le Neindre, Ad.R. Raduta, M.F. Rivet, et al.. New scalings in nuclear fragmentation. Physical Review Letters, 2010, 105, pp.142701. ⟨10.1103/PhysRevLett.105.142701⟩. ⟨hal-00454499v2⟩