s'authentifier
version française rss feed
HAL : in2p3-00719936, version 1

Fiche détaillée  Récupérer au format
Physical Review C 41 (1990) 139-146
Measurements of time delays for projectile-like fragments in the reaction 40Ar+Ge at 44 MeV/nucleon
J. Gomez del Campo, J. Barrette, R. A. Dayras, J. P. Wieleczko, E.C. Pollacco1, F. Saint-Laurent2, M. Toulemonde3, N. Neković, R. Ostojić
(1990)

Crystal-blocking angular distributions have been measured for projectile-like fragments produced in bombarding a 10-μm Ge crystal with a 1.76-GeV 40Ar beam. Long time delays of the order of (6-12)×10-18 s were extracted and gave a direct indication of important evaporation effects. The measured times can be reproduced using a broad distribution of primary fragments of the type predicted by the abrasion model, but with excitation energies from 15 to 50 MeV, which are higher than predicted by the model. The measured times can also be reproduced assuming a narrow primary mass distribution with highly excited fragments having excitation energies of about 150 MeV.
1 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
2 :  GANIL - Grand Accélérateur National d'Ions Lourds
3 :  CIMAP - UMR 6252 - Centre de recherche sur les Ions, les MAtériaux et la Photonique
Physique/Physique Nucléaire Expérimentale