Dynamical Dipole Mode in Heavy-Ion Fusion-Evaporation and Fission Reactions in the [sup 192]Pb Mass Region

2011 ◽  
Author(s):  
R. Silvestri ◽  
D. Pierroutsakou ◽  
C. Parascandolo ◽  
C. Agodi ◽  
R. Alba ◽  
...  
Keyword(s):  
Heavy Ion ◽  
Mass Region ◽  
Fission Reactions ◽  
Dipole Mode ◽  
Heavy Ion Fusion

scholarly journals Isospin Conservation in Neutron Rich Systems of Heavy Nuclei

2018 ◽  
Vol 178 ◽  
pp. 05007 ◽  
Author(s):  
Ashok Kumar Jain ◽  
Swati Garg
Keyword(s):  
Theoretical Calculation ◽  
Fission Fragment ◽  
Nuclear Fission ◽  
Heavy Ion ◽  
Mass Region ◽  
Fission Reactions ◽  
Heavy Nuclei ◽  
Practical Applications ◽  
Heavy Ion Fusion

It is generally believed that isospin would diminish in its importance as we go towards heavy mass region due to isospin mixing caused by the growing Coulomb forces. However, it was realized quite early that isospin could become an important and useful quantum number for all nuclei including heavy nuclei due to neutron richness of the systems [1]. Lane and Soper [2] also showed in a theoretical calculation that isospin indeed remains quite good in heavy mass neutron rich systems. In this paper, we present isospin based calculations [3, 4] for the fission fragment distributions obtained from heavy-ion fusion fission reactions. We discuss in detail the procedure adopted to assign the isospin values and the role of neutron multiplicity data in obtaining the total fission fragment distributions. We show that the observed fragment distributions can be reproduced rather reasonably well by the calculations based on the idea of conservation of isospin. This is a direct experimental evidence of the validity of isospin in heavy nuclei, which arises largely due to the neutron-rich nature of heavy nuclei and their fragments. This result may eventually become useful for the theories of nuclear fission and also in other practical applications.

scholarly journals Dynamical Dipole mode in heavy-ion fusion reactions in the192Pb mass region

2015 ◽  
Vol 590 ◽  
pp. 012052
Author(s):  
C Parascandolo ◽  
D Pierroutsakou ◽  
R Alba ◽  
A Del Zoppo ◽  
C Maiolino ◽  
...  
Keyword(s):  
Heavy Ion ◽  
Mass Region ◽  
Dipole Mode ◽  
Fusion Reactions ◽  
Heavy Ion Fusion

scholarly journals Dynamical Dipole mode in heavy-ion fusion reactions

2017 ◽  
Vol 163 ◽  
pp. 00043
Author(s):  
C. Parascandolo ◽  
D. Pierroutsakou ◽  
R. Alba ◽  
A. Del Zoppo ◽  
C. Maiolino ◽  
...  
Keyword(s):  
Heavy Ion ◽  
Dipole Mode ◽  
Fusion Reactions ◽  
Heavy Ion Fusion

DYNAMICAL SIMULATION OF EMISSION ANGLE DEPENDENCE OF FRAGMENTS SPIN IN HEAVY ION FUSION–FISSION REACTIONS

2010 ◽  
Vol 19 (07) ◽  
pp. 1451-1461 ◽  
Author(s):  
M. R. PAHLAVANI ◽  
D. NADERI ◽  
S. M. MIRFATHI
Keyword(s):  
Experimental Data ◽  
Heavy Ion ◽  
Emission Angle ◽  
Fission Reactions ◽  
Angle Dependence ◽  
Dynamical Simulation ◽  
Deformation Parameters ◽  
Average Spin ◽  
Neck Thickness ◽  
Heavy Ion Fusion

In this paper, a formalism consisting of multi-dimensional Langevin equation (LE) and Scission point Transition State Model (SCTSM) have been applied to study the angle dependence of fragment's average spin for 16 O + 209 Bi and 16 O + 232 Th systems. The influence of asymmetry and deformation parameters, neck thickness of compound nucleus and pre-scission neutron multiplicity on the fragment's average spin is discussed. Results obtained using this approach are in better agreement with the experimental data as compared with the SCTSM.

DYNAMICAL DIPOLE MODE IN FUSION HEAVY-ION REACTIONS

2010 ◽  
Vol 19 (05n06) ◽  
pp. 1031-1042 ◽  
Author(s):  
DIMITRA PIERROUTSAKOU
Keyword(s):  
Compound Nucleus ◽  
Transport Model ◽  
Heavy Ion ◽  
Mass Region ◽  
Dipole Mode ◽  
Fusion Reactions ◽  
Excitation Energies ◽  
Spin Distribution ◽  
Γ Ray ◽  
Experimental Findings

The prompt γ-ray emission, associated with the dynamical dipole mode decay, was investigated in the 32,36 S + 100,96 Mo and 36,40 Ar + 96,92 Zr fusion-evaporation reactions in the energy range E lab= 6 - 16 MeV / nucleon . The above reaction pairs populate, through entrance channels having different charge asymmetries, a compound nucleus in the 132 Ce mass region at excitation energies of 117, 174 and 284 MeV with identical spin distribution. By studying the differential γ-ray multiplicity spectra of the considered systems, the features of the dynamical dipole mode as a function of the beam energy were extracted while the γ-ray angular distributions were used to prove its pre-equilibrium character. The experimental findings were compared with theoretical predictions performed within a BNV transport model and based on a collective bremsstrahlung analysis of the entrance channel reaction dynamics. As a fast cooling mechanism on the fusion path, the prompt dipole radiation could be of interest for the synthesis of super heavy elements through hot fusion reactions providing a way to cool down the hot fusion paths, so ending up with a larger survival probability. To shed light on this hypothesis, the dynamical dipole mode investigation was extended to a heavier compound nucleus, 192 Pb , by means of the 40 Ca + 152 Sm and 48 Ca + 144 Sm reactions at E lab= 11 and 10.1 MeV/nucleon, respectively. Preliminary results of this measurement, concerning both fusion-evaporation and fission events are presented.

DYNAMICAL DIPOLE MODE IN FUSION HEAVY-ION REACTIONS IN THE MASS REGION OF A = 192

Exotic Nuclei ◽  
2013 ◽  
Author(s):  
C. PARASCANDOLO ◽  
D. PIERROUTSAKOU ◽  
C. AGODI ◽  
R. ALBA ◽  
V. BARAN ◽  
...  
Keyword(s):  
Heavy Ion ◽  
Mass Region ◽  
Dipole Mode ◽  
Heavy Ion Reactions
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