Roles of system size and excitation energy in probing nuclear dissipation with giant dipole resonanceγrays

2013 ◽  
Vol 88 (5) ◽  
Author(s):  
W. Ye ◽  
N. Wang ◽  
X. Chang
Keyword(s):  
Excitation Energy ◽  
System Size ◽  
Nuclear Dissipation

γ probe of nuclear dissipation

2014 ◽  
Vol 23 (06) ◽  
pp. 1460003 ◽  
Author(s):  
Ye Wei
Keyword(s):  
Excitation Energy ◽  
Giant Dipole Resonance ◽  
System Size ◽  
High Energy ◽  
Large System ◽  
Langevin Model ◽  
Dipole Resonance ◽  
Γ Ray ◽  
Nuclear Dissipation ◽  
Large System Size

The Langevin model is applied to investigate the roles of excitation energy and system size in the evolution of post-saddle giant dipole resonance (GDR) γ-ray multiplicity (Mγ) with post-saddle friction strength (β). It is demonstrated that Mγ is more sensitive to β at high energy. Furthermore, it is shown that the dependence of γ emission on friction is sensitive to the size of fissioning nuclei, and a large system size significantly increases the sensitivity. Our findings indicate that in experiments, to tightly constrain post-saddle dissipation through the γ probe, it is optimal to produce heavy fissioning systems with high energy.

Inference on fission timescale from neutron multiplicity measurement in18O+184W

2022 ◽  
Author(s):  
Niraj Kumar Rai ◽  
Aman Gandhi ◽  
M T Senthil Kannan ◽  
Sujan Kumar Roy ◽  
Saneesh Nedumbally ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Beam Energy ◽  
Incident Beam ◽  
Fission Process ◽  
Incident Beam Energy ◽  
Neutron Evaporation ◽  
Neutron Multiplicities ◽  
Nuclear Dissipation ◽  
Fission Yields ◽  
Primary Compound

Abstract The pre-scission and post-scission neutron multiplicities are measured for the 18O + 184W reaction in the excitation energy range of 67.23−76.37 MeV. Langevin dynamical calculations are performed to infer the energy dependence of fission decay time in compliance with the measured neutron multiplicities. Different models for nuclear dissipation are employed for this purpose. Fission process is usually expected to be faster at a higher beam energy. However, we found an enhancement in the average fission time as the incident beam energy increases. It happens because a higher excitation energy helps more neutrons to evaporate that eventually stabilizes the system against fission. The competition between fission and neutron evaporation delicately depends on the available excitation energy and it is explained here with the help of the partial fission yields contributed by the different isotopes of the primary compound nucleus.

Nuclear dissipation at high excitation energy and angular momenta in reaction forming Np227

2019 ◽  
Vol 99 (2) ◽  
Author(s):  
M. Shareef ◽  
E. Prasad ◽  
A. Jhingan ◽  
N. Saneesh ◽  
K. S. Golda ◽  
...  
Keyword(s):  
Excitation Energy ◽  
High Excitation Energy ◽  
High Excitation ◽  
Angular Momenta ◽  
Nuclear Dissipation

TRACKING DISSIPATION IN CAPTURE REACTIONS

2004 ◽  
Vol 13 (01) ◽  
pp. 285-292 ◽  
Author(s):  
T. MATERNA ◽  
V. BOUCHAT ◽  
V. KINNARD ◽  
F. HANAPPE ◽  
O. DORVAUX ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Analysis Procedure ◽  
Neutron Multiplicity ◽  
Dynamical Models ◽  
Nuclear Dissipation ◽  
First Time ◽  
Standing Problem

Nuclear dissipation in capture reactions is investigated using backtracing. Combining the analysis procedure with dynamical models, the difficult and long-standing problem of competition and mixing of quasi-fission and fusion-fission is solved for the first time. At low excitation energy a new protocol able to handle low statistics data gives access to the prescission neutron multiplicity in two different systems 48 Ca +208 Pb, Pu . The results are in agreement with a domination of fusion-fission in the case of 256 No and an equal mixing of quasi-fission and fusion-fission in the case of Z=114. The nature of the relevant dissipation is determined as one-body dissipation.

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