Abstract
The emission probability of Intermediate Mass Fragments (IMFs) in non-central reactions has been investigated in collisions of heavy \(^{124}\hbox {Xe}\) projectiles with the two different medium-mass targets of \(^{64}\hbox {Ni}\) and \(^{64}\hbox {Zn}\) 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 \(^{64}\hbox {Ni}\) 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 \(^{112,124}\hbox {Sn}\) + \(^{58,64}\hbox {Ni}\) 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.
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Data Availability Statement
This manuscript has no associated data or the data will not be deposited. [Authors’ comment: Data generated during this study are contained in this published article].
Notes
For the sake of simplicity, we assume that in a semi-peripheral collision of a projectile P and a target T, the binary (at first) system PLF* + TLF* is formed, \(P+T\rightarrow PLF^{*}+TLF^{*}\). A two-step-decay scenario is assumed: The IMF is emitted from the projectile primary fragment PLF* (or TLF*), \(PLF^{*}\rightarrow PLF+IMF\). In the analysis, the PLF* is reconstructed from the PLF-IMF pair, neglecting neutrons and light charged particle (\(Z\le 2\)) emission.
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Acknowledgements
We thank the INFN-LNS staff for providing both beams and targets of excellent quality. We are grateful also to the electronics, advanced technology and mechanical design staffs of INFN-division of Catania.
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Communicated by A.F. Di Pietro
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Russotto, P., De Filippo, E., Pagano, E.V. et al. Dynamical versus statistical production of Intermediate Mass Fragments at Fermi Energies. Eur. Phys. J. A 56, 12 (2020). https://doi.org/10.1140/epja/s10050-019-00011-z
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DOI: https://doi.org/10.1140/epja/s10050-019-00011-z