https://doi.org/10.1140/epja/s10050-019-00011-z
Regular Article - Experimental Physics
Dynamical versus statistical production of Intermediate Mass Fragments at Fermi Energies
1
INFN, Laboratori Nazionali del Sud, Catania, Italy
2
INFN, Sezione di Catania, Catania, Italy
3
Dipartimento di Fisica e Astronomia E. Majorana, Univ. di Catania, Catania, Italy
4
Instituto de Física, Universidad Nacional Autónoma de México, Mexico, Mexico
5
Dipartimento di Scienze MIFT, Univ. di Messina, Messina, Italy
6
National Centre for Nuclear Research, Otwock-Świerk, Poland
7
Università di Enna “Kore”, Enna, Italy
8
INFN, Sezione di Napoli and Dipartimento di Fisica, Univ. di Napoli, Naples, Italy
9
Present address: STFC, Rutherford Appleton Lab., ISIS Facility, Harwell, OX11 0QX, UK
10
Heavy Ion Laboratory, University of Warsaw, Warsaw, Poland
11
Faculty of Physics, University of Warsaw, Warsaw, Poland
12
Present address: Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Orsay, Université Paris-Saclay, Orsay Cedex, France
* e-mail: russotto@lns.infn.it
Received:
4
September
2018
Accepted:
15
November
2019
Published online:
21
January
2020
The emission probability of Intermediate Mass Fragments (IMFs) in non-central reactions has been investigated in collisions of heavy 
projectiles with the two different medium-mass targets of 
and 
at the laboratory energy of 35 A MeV. The two colliding systems differ only for the target atomic number Z and, consequently, for the isospin N/Z ratio. The probability of IMFs emission from the projectile-like fragment has been measured, showing an enhancement of the IMFs emission for the neutron rich target. Most of the observed projectile break-up yield is associated with the production of only one IMF, that is, a quasi-binary splitting of projectile in two fragments in a broad range of charge asymmetry. For the events with one IMF, the relative contributions of the dynamical and statistical emissions have been evaluated. We find an enhancement of dynamical break-up probability for the neutron rich target with respect to the neutron poor one. The analysis suggests influence of the target isospin in inducing the dynamical break-up of projectile-like fragments. The new data have been also compared with previous published results of 
+ 
systems, in order to disentangle between isospin effects against system-size effects on the emission probability. The comparisons between previous and new data suggest that the dynamical break-up is determined by the N/Z content of both projectile and target; for the cases here investigated, the influence of the system size on the dynamical emission probability can be excluded.
© Società Italiana di Fisica (SIF) and Springer-Verlag GmbH Germany, part of Springer Nature, 2020
