Presence of quasifission in the 30Si+176Yb reaction populating the compound nucleus 206Po
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Date
2025
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Abstract
Fission fragment mass distribution has been studied for the reaction 30Si+176Yb populating the compound
nucleus 206Po at near-barrier energies to understand the effects of entrance channel mass asymmetry and
deformation in the preactinide region. No appreciable deviation from a single Gaussian fit to the experimental
mass distribution shows a nearly symmetric mass split for the composite system at the present experimental
energy range. The experimentally measured fission fragments mass variance for 30Si+176Yb has been compared
with the more asymmetric reaction 12C+194Pt having mass asymmetry lying on either side of the αBG value.
The statistical saddle point model (SSPM) calculations based on compound nucleus fission for the two reactions
indicate the presence of quasifission in the 30Si+176Yb reaction. Moreover, the higher variance of mass
distribution near and below barrier energies shows the effect of deformation of the projectile and target on
quasifission. The experimental data are also compared with the fission of nearby systems. The present result is
consistent with the earlier findings of evaporation residue (ER) cross section for the reaction 30Si+176Yb, where
suppression in the ER cross section is attributed to noncompound nucleus fission and its dependance on entrance
channel properties.