Prescission neutron multiplicities and nuclear viscosity: A systematic study

Bhattacharya, C.; Bhattacharya, Sumantra; Krishan, K.

doi:10.1103/physrevc.53.1012

Cited by 20 publications

(20 citation statements)

References 17 publications

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“…The [10,13,14]. For the non-conservative part of the interaction, we would consider viscous drag arising not only due to two body collision but also due to the collisions of the nucleons with the wall or surface of the nucleus.…”

Section: Numerical Calculation and Resultsmentioning

confidence: 99%

Dissipative dynamics of fission in the framework of asymptotic expansion of Fokker-Planck equation

Dhara

Bhattacharya

Krishan

2000

EPJ A

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The dynamics of fission has been formulated by generalising the asymptotic expansion of the Fokker-Planck equation in terms of the strength of the fluctuations where the diffusion coefficients depend on the stochastic variables explicitly. The prescission neutron multiplicities and mean kinetic energies of the evaporated neutrons have been calculated and compared with the respective experimental data over a wide range of excitation energy and compound nuclear mass. The mean and the variance of the total kinetic energies of the fission fragments have been calculated and compared with the experimental values.

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Section: Numerical Calculation and Resultsmentioning

confidence: 99%

Dissipative dynamics of fission in the framework of asymptotic expansion of Fokker-Planck equation

Dhara

Bhattacharya

Krishan

2000

EPJ A

Self Cite

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“…These include Kramers' stationary limit 34) and an exponential factor applied to Kramers' fission width to account for the transient time, after which the statistical regime is reached. The systematics obtained by Bhattacharya et al 35) allow us to take into account the dependencies of the reduced dissipation coefficient dis on the incident energy per nucleon and compound nucleus mass A cn . dis is the ratio between the friction coefficient , which describes the coupling of the fission degree of freedom to the intrinsic degrees of freedom, and the reduced mass of the system.…”

Section: Methods Of Calculationmentioning

confidence: 99%

“…This ratio characterizes the dissipative and diffusive motion. In the calculations of the fission width including the Kramers' factor, we use for the reduced dissipation coefficient the simple form given by Bhattacharya et al: 35) …”

Section: Methods Of Calculationmentioning

confidence: 99%

Entrance Channel Effect on the Formation of Heavy and Superheavy Nuclei

et al. 2003

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We study the effect of the entrance channel and the shell structure of reacting massive nuclei on the fusion mechanism and the formation of evaporation residues of heavy and superheavy nuclei. In the framework of the combined dinuclear system concept and advanced statistical model, we analyze the 40 Ar + 176 Hf, 86 Kr + 130 Xe and 124 Sn + 92 Zr reactions leading to 216 Th Ã ; the 32 S + 182 W, 48 Ti + 166 Er, and 60 Ni + 154 Sm reactions leading to 214 Th Ã ; the 40 Ar + 181 Ta reaction leading to 221 Pa Ã ; the 48 Ca + 248 Cm reaction leading to the 296 116 compound nucleus. In our calculations of the excitation functions for capture, fusion and evaporation residues we use the relevant variables such as mass-asymmetry of nuclei in the entrance channel, relative distance between nuclear centers, shell effect and shape of colliding nuclei and such characteristics of the reaction mechanism as potential energy surface, driving potential, the dependence of capture, fusion cross sections and survival probability of compound nucleus on the orbital angular momentum. As a result we obtain a beam energy range for the capture of the nuclei before the system fuses and the À n =À f ratio at each step along the de-excitation cascade of the compound nucleus. Calculations allow us to reach useful conclusions about the mechanism of the fusion-fission process, that is in competition with the quasifission process, and the production of the evaporation residues.

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“…The systematics obtained by Bhattacharya et al [16] gives the possibility of taking into account the incident energy per nucleon¯and compound nucleus mass Ò dependencies of the reduced dissipation coefficient ¬ (the ratio between the friction coefficient describing the coupling to the fission degree of freedom and the Ñ reduced mass of the system. We use the same set of parameters for all superheavy nuclei and there are no free parameters in our calculations.…”

Section: General Remarks On the Formalismmentioning

confidence: 99%

Fusion-fission dynamics in the superheavy nucleus production

et al. 1999

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The fusion-fission reaction mechanism leading to the massive nucleus formation is studied. We investigate the superheavy nucleus formation in heavy-ion induced reactions by analysing the evaporation residue (ER) production in order to study the fusion dynamics and the decay properties of nuclei close to the stability island at ½½ . We consider the Ni + ¾¼ Pb, Ca + ¾¿ U and Ca + ¾ Pu reactions that lead to the ½½¼ ½½¾ and 114 superheavy elements respectively. By using the dinuclear system (DNS) concept of the two interacting nuclei we calculate the quasifission-fusion competition in the entrance channel and the fission-evaporation competition along the de-excitation cascade of the compound nucleus. The dynamics of the entrance channel allows us to determine the beam energy window which is favorable to the fusion, while the dynamic evolution of the compound nucleus on the shell correction to the fission barrier and the dissipative effects influence the fission-evaporation competition in order to obtain the residue nuclei from the superheavy nucleus formation. We also calculate the Ò ØÓØ ratio at each step of the de-excitation cascade of the compound nucleus and we present a systematics of Ò ØÓØ (at first step of the cascade) for many reactions that lead to nuclei with ½¼¾-½½ .

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Prescission neutron multiplicities and nuclear viscosity: A systematic study

Cited by 20 publications

References 17 publications

Dissipative dynamics of fission in the framework of asymptotic expansion of Fokker-Planck equation

Dissipative dynamics of fission in the framework of asymptotic expansion of Fokker-Planck equation

Entrance Channel Effect on the Formation of Heavy and Superheavy Nuclei

Fusion-fission dynamics in the superheavy nucleus production

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