Dynamical versus statistical production of Intermediate Mass Fragments at Fermi Energies
Dynamical versus statistical production of Intermediate Mass Fragments at Fermi Energies
复制标题
费米能源公司中间质量碎片的动态与统计生产
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
J. Wilczyński
中科院分区：
文献类型：
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作者：
P. Russotto;E. Filippo;E. Pagano;L. Acosta;L. Auditore;T. Cap;G. Cardella;S. Luca;E. Geraci;B. Gnoffo;G. Lanzalone;I. Lombardo;C. Maiolino;N. Martorana;T. Minniti;S. Norella;A. Pagano;M. Papa;E. Piasecki;S. Pirrone;G. Politi;F. Porto;L. Quattrocchi;F. Rizzo;E. Rosato;K. Siwek;A. Trifirò;M. Trimarchi;G. Verde;J. Wilczyński
The emission probability of Intermediate Mass Fragments (IMFs) in non-central reactions has been investigated in collisions of heavy $$^{124}hbox {Xe}$$ 124 Xe projectiles with the two different medium-mass targets of $$^{64}hbox {Ni}$$ 64 Ni and $$^{64}hbox {Zn}$$ 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 $$^{64}hbox {Ni}$$ 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 $$^{112,124}hbox {Sn}$$ 112 , 124 Sn + $$^{58,64}hbox {Ni}$$ 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.
The emission probability of Intermediate Mass Fragments (IMFs) in non-central reactions has been investigated in collisions of heavy $$^{124}hbox {Xe}$$ 124 Xe projectiles with the two different medium-mass targets of $$^{64}hbox {Ni}$$ 64 Ni and $$^{64}hbox {Zn}$$ 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 $$^{64}hbox {Ni}$$ 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 $$^{112,124}hbox {Sn}$$ 112 , 124 Sn + $$^{58,64}hbox {Ni}$$ 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.