Experimental signature of entrance channel effect in heavy mass region via evaporation residue cross section and spin distribution measurements

2008 ◽  
Vol 670 (2) ◽  
pp. 99-102 ◽  
Author(s):  
P.D. Shidling ◽  
N. Madhavan ◽  
V.S. Ramamurthy ◽  
S. Nath ◽  
N.M. Badiger ◽  
...  
Keyword(s):  
Cross Section ◽  
Mass Region ◽  
Evaporation Residue ◽  
Entrance Channel ◽  
Spin Distribution ◽  
Channel Effect ◽  
Evaporation Residue Cross Section

Fission hindrance studies inPb200: Evaporation residue cross section and spin distribution measurements

2006 ◽  
Vol 74 (6) ◽  
Author(s):  
P. D. Shidling ◽  
N. M. Badiger ◽  
S. Nath ◽  
R. Kumar ◽  
A. Jhingan ◽  
...  
Keyword(s):  
Cross Section ◽  
Evaporation Residue ◽  
Spin Distribution ◽  
Evaporation Residue Cross Section

Fusion studies in Cl35,37+Ta181 reactions via evaporation residue cross section measurements

2020 ◽  
Vol 102 (3) ◽  
Author(s):  
P. V. Laveen ◽  
E. Prasad ◽  
N. Madhavan ◽  
A. K. Nasirov ◽  
J. Gehlot ◽  
...  
Keyword(s):  
Cross Section ◽  
Evaporation Residue ◽  
Evaporation Residue Cross Section

LANGEVIN DESCRIPTION OF THE EVAPORATION RESIDUE SPIN DISTRIBUTION

2008 ◽  
Vol 17 (09) ◽  
pp. 1875-1882 ◽  
Author(s):  
WEI YE ◽  
HONG-WEI YANG ◽  
FENG WU
Keyword(s):  
Theoretical Calculations ◽  
Accurate Determination ◽  
Viscosity Coefficient ◽  
Evaporation Residue ◽  
Langevin Equations ◽  
Compound System ◽  
Spin Distribution ◽  
Langevin Approach ◽  
Evaporation Residue Cross Section

The recently measured spin distribution of evaporation residue cross section in the reaction 16 O + 184 W is studied in the framework of Langevin equations. Results show that the Langevin approach can describe this observable very well. Moreover, a pre-saddle nuclear viscosity coefficient of 5 × 1021 s-1 is extracted by comparing theoretical calculations with experimental data. We also explore the effect of the isospin of a system on the spin distribution by evaluating the evaporation residue spin distribution of nuclei 194 Pb , 200 Pb and 206 Pb . It has been found that with increasing the isospin of the system, the sensitivity of the evaporation residue spin distribution to the nuclear viscosity is decreased significantly. This result suggests that choosing a low-isospin compound system favors an accurate determination of pre-saddle dissipation strength.

Effects of level density parameter on the superheavy production in cold fusion

2014 ◽  
Vol 29 (40) ◽  
pp. 1450214 ◽  
Author(s):  
M. R. Pahlavani ◽  
S. A. Alavi
Keyword(s):  
Cross Section ◽  
Neutron Emission ◽  
Level Density ◽  
Cold Fusion ◽  
Heavy Ion ◽  
Evaporation Residue ◽  
Density Parameter ◽  
Fusion Reactions ◽  
Level Density Parameter ◽  
Evaporation Residue Cross Section

By using semiclassical method and considering Woods–Saxon and Coulomb potentials, the level density parameter a was calculated for three superheavy nuclei 270110, 278112 and 290116. Obtained results showed that the value of level density parameter of these nuclei is near to the simple relation a ≈ A/10. In framework of the dinuclear system model, the effects of level density parameter on the probability of the formation of a compound nucleus, the ratio of neutron emission width and fission width, and evaporation residue cross-section of three cold fusion reactions 62 Ni +208 Pb , 70 Zn +208 Pb and 82 Se +208 Pb , leading to superheavy elements were investigated. The findings indicate that the level density parameter play a significant role in calculations of heavy-ion fusion–fission reactions. The obtained results in the case of a = A/12 have larger values in comparison with calculated level density parameter with Woods–Saxon potential (a WS ) and a = A/10. The theoretical results of the evaporation residue cross-section are very sensitive to the choice of level density parameter. The calculated values with a WS are in good agreement with experimental values.

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