Dynamical versus statistical production of Intermediate Mass Fragments at Fermi Energies

The emission probability of Intermediate Mass Fragments (IMFs) in non-central reactions has been investigated in collisions of heavy 124 Xe projectiles with the two different medium-mass targets of 64 Ni and 64 Zn at the laboratory energy of 35 A MeV. The two colliding systems differ only for the ta...

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Bibliographic Details
Published in:The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2020, Vol.56 (1), Article 12
Main Authors: Russotto, P., De Filippo, E., Pagano, E. V., Acosta, L., Auditore, L., Cap, T., Cardella, G., De Luca, S., Geraci, E., Gnoffo, B., Lanzalone, G., Lombardo, I., Maiolino, C., Martorana, N. S., Minniti, T., Norella, S., Pagano, A., Papa, M., Piasecki, E., Pirrone, S., Politi, G., Porto, F., Quattrocchi, L., Rizzo, F., Rosato, E., Siwek-Wilczyńska, K., Trifirò, A., Trimarchi, M., Verde, G., Wilczyński, J.
Format: Article
Language:English
Subjects:
Atomic properties
Breakup
Emission analysis
Fragments
Hadrons
Heavy Ions
Nuclear Fusion
Nuclear Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Projectiles
Regular Article - Experimental Physics
Size effects
Statistical analysis
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Summary:The emission probability of Intermediate Mass Fragments (IMFs) in non-central reactions has been investigated in collisions of heavy 124 Xe projectiles with the two different medium-mass targets of 64 Ni and 64 Zn 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 64 Ni 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 112 , 124 Sn + 58 , 64 Ni 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.
ISSN:1434-6001
1434-601X
DOI:10.1140/epja/s10050-019-00011-z