Multifragmentation of very heavy nuclear systems (III): fragment velocity correlations and event topology at freeze-out.

G. Tãbãcaru (1, 2) , M.-F. Rivet (1) , B. Borderie (1) , M. Pârlog (1, 2, 3) , B. Bouriquet (3) , A. Chbihi (3) , J.D. Frankland (3) , J.P. Wieleczko (3) , Eric Bonnet (1) , R. Bougault (4) , R. Dayras (5) , E. Galichet (1) , D. Guinet (6) , P. Lautesse (6) , N. Le Neindre (1) , O. Lopez (4) , L. Manduci (4) , L. Nalpas (5, 7) , P. Pawlowski (8) , E. Rosato (9) , R. Roy (10) , S. Salou (3) , B. Tamain (4) , E. Vient (4) , M. Vigilante (9) , C. Volant (5)

1 IPNO - Institut de Physique Nucléaire d'Orsay
2 NIPNE - National Institute for Physics and Nuclear Engineering
3 GANIL - Grand Accélérateur National d'Ions Lourds
4 LPCC - Laboratoire de physique corpusculaire de Caen
5 DPHN - Département de Physique Nucléaire (ex SPhN)
6 IPNL - Institut de Physique Nucléaire de Lyon
7 DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
8 H. Niewodniczanski Institute of Nuclear Physics
9 Dipartimento di Scienze Fisiche e Sezione INFN
10 Département de Physique

Kinetic energy spectra and fragment velocity correlations, simulated by means of stochastic mean-field calculations, are successfully confronted with experimental data for single multifragmenting sources prepared at the same excitation energy per nucleon in 32 AMeV 129Xe+natSn and 36 AMeV 155Gd+natU central collisions. Relying thus on simulations, average freeze-out times of 200-240 fm/c are estimated The corresponding spatial distributions of fragments are more compact for the lighter system (~3-4V_0 vs ~8V_0).

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

G. Tãbãcaru, M.-F. Rivet, B. Borderie, M. Pârlog, B. Bouriquet, et al.. Multifragmentation of very heavy nuclear systems (III): fragment velocity correlations and event topology at freeze-out.. Nuclear Physics A, 2006, 764, pp.371-386. ⟨10.1016/j.nuclphysa.2005.08.019⟩. ⟨hal-00008225⟩