Theoretical study of effects of the entrance channel on the relative yield of complete fusion and quasifission in heavy-ion collisions within a dinuclear system approach

Soheyli, S.; Khanlari, M. Varasteh

doi:10.1103/physrevc.94.034615

Cited by 19 publications

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“…The reactions are specified by projectile (Proj), target (Targ) and projectile lab energy used (Ep), fusion barrier (V b ) [53], evaporation channel (chnl) and fission-barrier of the compound nucleus (B f c ). Evaporation residue cross-section (σevr) [45], fusion-fission lifetime (τ f f ) [54], quasifission barrier [55] and cross-section (σ qf ) [56], quasifission lifetime (τ qf ) [57], maximum Coulomb-excitation energy transfer (MCET), fission barrier of the heavier -either projectile or target nuclei (B f h ) [48], Coulomb fission cross-section (σ cf ) [56], highest spin I state that can be populated, and corresponding ∆ECET . Where and R = R m [62] are the angular momentum and distance at which the nucleus-nucleus potential is minimum, respectively.…”

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On the timescale of quasi fission and Coulomb fission

Nandi¹,

Manjunatha²,

Gupta³

et al. 2021

Preprint

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Coulomb fission mechanism may take place if the maximum Coulomb-excitation energy transfer in a reaction exceeds the fission barrier of either the projectile or target. This condition is satisfied by all the reactions used for the earlier blocking measurements except one reaction 208 Pb + Natural Ge crystal, where the measured timescale was below the measuring limit of the blocking measurements < 1 as. Hence, inclusion of the Coulomb fission in the data analysis of the blocking experiments leads us to interpret that the measured time longer than a few attoseconds (about 2-2.5 as) is nothing but belonging to the Coulomb fission timescale and shorter than 1 as are due to the quasifission. Consequently, this finding resolves the critical discrepancies between the fission timescale measurements using the nuclear and blocking techniques. This, in turn, validates the fact that the quasifission timescale is indeed of the order of zeptoseconds in accordance with the nuclear experiments and theories. It thus provides a radical input in understanding the reaction mechanism for heavy element formation via fusion evaporation processes.

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“…Where V C , V N and V rot are the Coulomb, nuclear and rotational potentials, respectively and are evaluated using a set of equations given by Soheyli and Khanlari [55].…”

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