Dynamical Dipole mode in heavy-ion fusion reactions in the 192Pb mass region

C Parascandolo ,M Mazzocco ,A Guglielmetti ,Riccardo Silvestri ,M Di Toro ,C Signorini ,F Farinon ,M Romoli ,D Torresi ,Carmelo J Rizzo ,A Trifirò ,F Soramel ,R Alba ,M Colonna ,D Pierroutsakou ,U Emanuele ,V Baran ,A Del Zoppo ,E De Filippo ,A Boiano ,D Santonocito ,C Mazzocchi ,M La Commara ,E Strano ,R Coniglione ,B Martin ,C Maiolino ,C Agodi ,M Trimarchi

doi:10.1088/1742-6596/590/1/012052

Abstract

The dynamical dipole mode was investigated in the mass region of the 192Pb compound nucleus, by using the 40Ca + 152Sm and 48Ca + 144Sm reactions at Elab=11 and 10.1 MeV/nucleon, respectively. Both fusion-evaporation and fission events were studied simultaneously for the first time. Our results for evaporation and fission events (preliminary) show that the dynamical dipole mode survives in reactions involving heavier nuclei than those studied previously.

Highlights

In N/Z asymmetric heavy-ion reactions, it is possible to excite a pre-equilibrium collective dipole oscillation that can develop along the symmetry axis of the dinuclear system [1,2,3]
The experiment was performed by using the 40Ca (48Ca) pulsed beam provided by the Superconducting Cyclotron of the LNS, impinging on a 1 mg/cm2 thick 152Sm (144Sm) target at Elab = 440(485) MeV
According to PACE2 calculations [11], the spin distribution of the CN formed in the two reactions is identical

Summary

Introduction

In N/Z asymmetric heavy-ion reactions, it is possible to excite a pre-equilibrium collective dipole oscillation that can develop along the symmetry axis of the dinuclear system [1,2,3]. The emission of pre-equilibrium DD -rays in fusion reactions decreases the excitation energy and the initial temperature of the nucleus reaching the statistical phase. The experiment was performed by using the 40Ca (48Ca) pulsed beam provided by the Superconducting Cyclotron of the LNS, impinging on a 1 mg/cm2 thick 152Sm (144Sm) target at Elab = 440(485) MeV.

Results

Conclusion