https://doi.org/10.1051/epjconf/20111710005
Decay of excited nuclei produced in the 78,82Kr+40Ca reactions at 5.5 MeV/nucleon
1
Grand Accélérateur National d’Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Bvd H. Becquerel, 14076, Caen, France
2
Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
3
Dipartimento di Scienze Fisiche, Università di Napoli ”Federico II”, I-80126, Napoli, Italy
4
INFN, Sezione di Napoli, I-80126, Napoli, Italy
5
Joint Institute for Nuclear Research, 141980 Dubna, Russia
6
Institute of Nuclear Physics, 702132 Tashkent, Uzbekistan
7
IPHC, IN2P3-CNRS and Université Strasbourg, F-67037, Strasbourg Cedex2, France
8
INFN, Sezione di Firenze, I-50125 Firenze, Italy
9
IPNO, IN2P3-CNRS and Université Paris-Sud 11, F-91406, Orsay Cedex, France
10
LPC, IN2P3-CNRS, ENSICAEN and Université, F-14050, Caen Cedex, France
11
CEA, IRFU, SPhN, CEA/Saclay, F-91191, Gif-sur-Yvette Cedex, France
12
INFN, LNL, I-35020 Legnaro ( Padova ) Italy
13
INFN, Sezione di Bologna, I-40127 Bologna, Italy
14
IPNL, IN2P3-CNRS et Université, F-69622, Villeurbanne Cedex, France
15
Laboratoire de Physique Nucléaire, Université de Laval, Québec, Canada
16
Dipartimento di Scienze Ambientali, Seconda Università di Napoli, I-81100, Caserta, Italy
a
e-mail: ademard@ganil.fr
Decay modes of excited nuclei are studied in 78,82Kr + 40Ca reactions at 5.5 MeV/nucleon by means of light-charged particles measured in coincidence with intermediate mass fragments and fission-like fragments. Inclusive cross-section distributions of fragments with charge 3 ≤ Z ≤ 28 are bell-shaped and a strong oddeven-staggering (o-e-s) is observed for 3 ≤ Z ≤ 12. Coincidence measurements suggest that the light partners in very asymmetric fission are emitted at excitation energies below the particle emission thresholds. Data were confronted to the predictions of statistical models describing the decay of compound nuclei by emission of light particles and fragments. Comparison with models suggests that the o-e-s of the light-fragment yields is mainly due to the successive steps of compound nucleus disintegration.
© Owned by the authors, published by EDP Sciences, 2011