Angular distributions in heavy-ion-induced fission

Back, B. B.; Betts, R. R.; Gindler, J.E.; Wilkins, B.D.; Saini, S.; Tsang, M. B.; Gelbke, C. K.; Lynch, W. G.; McMahan, M. A.; Baisden, P. A.

doi:10.1103/physrevc.32.195

Cited by 260 publications

(139 citation statements)

References 42 publications

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“…The decay of DNS without reaching the equilibrated shape of the CN formation [7,10,11] is called quasifission process and its cross section is obtained by the following expression…”

Section: Resultsmentioning

confidence: 99%

Real causes of apparent abnormal results in heavy ion reactions

Mandaglio

Nasirov

Anastasi

et al. 2015

EPJ Web of Conferences

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Abstract. We study the effect of the static characteristics of nuclei and dynamics of the nucleus-nucleus interaction in the capture stage of reaction, in the competition between quasifission and complete fusion processes, as well as the angular momentum dependence of the competition between fission and evaporation processes along the de-excitation cascade of the compound nucleus. The results calculated for the mass-asymmetric and less mass-asymmetric reactions in the entrance channel are analyzed in order to investigate the role of the dynamical effects on the yields of the evaporation residue nuclei. We also discuss about uncertainties at the extraction of such relevant physical quantities as Γ n /Γ tot ratio or also excitation functions from the experimental results due to the not always realistic assumptions in the treatment and analysis of the detected events. This procedure can lead to large ambiguity when the complete fusion process is strongly hindered or when the fast fission contribution is large. We emphasize that a refined multiparameter model of the reaction dynamics as well as a more detailed and checked data analysis are strongly needed in heavy-ion collisions.

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“…The decay of DNS without reaching the equilibrated shape of the CN formation [7,10,11] is called quasifission process and its cross section is obtained by the following expression…”

Section: Resultsmentioning

confidence: 99%

Real causes of apparent abnormal results in heavy ion reactions

Mandaglio

Nasirov

Anastasi

et al. 2015

EPJ Web of Conferences

View full text Add to dashboard Cite

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“…Experimental analysis of the fragment angular distributions W (θ) is commonly expressed in terms of a twocomponent expression for fusion-fission and quasifission parts [26,27,[99][100][101],…”

Section: B Fragment Angular Distributionsmentioning

confidence: 99%

Shape evolution and collective dynamics of quasifission in the time-dependent Hartree-Fock approach

2015

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Background: At energies near the Coulomb barrier, capture reactions in heavy-ion collisions result either in fusion or in quasifission. The former produces a compound nucleus in statistical equilibrium, while the second leads to a reseparation of the fragments after partial mass equilibration without formation of a compound nucleus. Extracting the compound nucleus formation probability is crucial to predict superheavy-element formation crosssections. It requires a good knowledge of the fragment angular distribution which itself depends on quantities such as moments of inertia and excitation energies which have so far been somewhat arbitrary for the quasifission contribution.Purpose: Our main goal is to utlize the time-dependent Hartee-Fock (TDHF) approach to extract ingredients of the formula used in the analysis of experimental angular distributions. These include the moment-of-inertia and temperature.Methods: We investigate the evolution of the nuclear density in TDHF calculations leading to quasifission. We study the dependence of the relevant quantities on various initial conditions of the reaction process.Results: The evolution of the moment of inertia is clearly non-trivial and depends strongly on the characteristics of the collision. The temperature rises quickly when the kinetic energy is transformed into internal excitation. Then, it rises slowly during mass transfer.Conclusions: Fully microscopic theories are useful to predict the complex evolution of quantities required in macroscopic models of quasifission.

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“…In He gas the ERs have a lower charge state than the beam particles; He gas gives optimal separation between ERs and scattered beam. Detailed ER cross section excitation functions have been measured for fusion of 58 Ni with 58,60,64 Ni, allowing high quality fusion barrier distributions [13] to be determined [21], as shown in Fig. 5.…”

Section: Fusion Excitation Functionsmentioning

confidence: 99%