“Fast fusion” and “quasifission”: two possible mass-relaxation modes in asymmetric heavy-ion collisions leading to systems with Ztot = 108

Gippner, P.; Brösa, U.; Feldmeier, H.; Schmidt, R.

doi:10.1016/0370-2693(90)90861-y

Cited by 20 publications

(3 citation statements)

References 13 publications

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“…This would imply presence of additional degrees of freedom and couplings in the entrance channel for the systems leading to a fissionable compound nucleus. Other mechanisms proposed for understanding heavy-ion collisions such as multidimensional tunneling [26] and diffusion [27] processes could also be considered to contribute to the observed anomalies. Further investigations are needed to resolve these apparent differences between fissionable and nonfissionable compound systems.…”

Section: Analysis and Discussionmentioning

confidence: 98%

Near-barrier fission of the system12C+232Th

Karnik

Kailas

Chatterjee

et al. 1995

Z. Physik A - Hadrons and Nuclei

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Abstract. The fission fragment angular distributions for the system 12C + 232Th have been measured in the energy range 0.97 < Ec.m./VB < 1.22. The measured anisotropies have been compared with the predictions of the standard saddle point statistical model, using the second moment of the compound nucleus spin distribution (I 2) deduced from a Wong model fit to the fission excitation function. While the measured anisotropies agree with the standard saddle point statistical model for E .... /VB > 1.05, they are abnormally large at lower energies. This is also true for the existing measurements of 160 and 19F -+-232Th systems. Since for this system pre-equilibrium fission contributions are not expected, this anomaly indicates strong channel coupling effects leading to an increase in (/2) at sub-barrier energies.

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Section: Analysis and Discussionmentioning

confidence: 98%

Near-barrier fission of the system12C+232Th

Karnik

Kailas

Chatterjee

et al. 1995

Z. Physik A - Hadrons and Nuclei

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“…The potential energy is usually known. It is the so called driving potential [6,7]. The calculation of the kinetic energy is a more complicated task [5,8].…”

Section: Kinetic Energymentioning

confidence: 99%

Mechanism of enhanced yield of light particles in compound nucleus formation

Antonenko

Jolos

1991

Z. Physik A - Hadrons and Nuclei

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The coupling of the radial and mass-asymmetry modes is analysed. It is shown that this coupling is weak for near symmetric configurations and enhances strongly if the asymmetry increases. The interpretation of enhanced yield of light particles in fusion-type reactions is suggested. The role of the angular momentum and friction is considered. The dependence of calculation results on the entrance channel is indicated. The form of the nucleus-nucleus potential for very asymmetric configurations is discussed. PACS" 25.70.Jj; 25.70.Lm

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“…[23] are Λ(q, q ′ , t) = κ 0 exp[V (q ′ , t)/2T (q ′ , t) − V (q, t)/2T (q, t)], justified by the assumption that the level density of the system determines the transition. The strengh constant κ 0 characterizes the global time scale and has a realistic value of ∼ 10 22 s −1 [24]. The sum in Eq.…”

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confidence: 99%

Formation of the Compound Nucleus in Fusion of Heavy Nuclei

Díaz-Torres

2004

Structure and Dynamics of Elementary Matter

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A new model that includes the time-dependent dynamics of the single-particle (s.p.) motion in conjunction with the macroscopic evolution of the system is proposed for describing the compound nucleus (CN) formation in fusion of heavy nuclei. The diabaticity initially keeps the entrance system around its contact configuration, but the gradual transition from the diabatic to the adiabatic potential energy surface (PES) leads to fusion or quasifission. Direct measurements of the probability for CN formation are crucial to discriminate between the current models.

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“Fast fusion” and “quasifission”: two possible mass-relaxation modes in asymmetric heavy-ion collisions leading to systems with Ztot = 108

Cited by 20 publications

References 13 publications

Near-barrier fission of the system12C+232Th

Near-barrier fission of the system12C+232Th

Mechanism of enhanced yield of light particles in compound nucleus formation

Formation of the Compound Nucleus in Fusion of Heavy Nuclei

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