School of Basic Sciences

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Browsing School of Basic Sciences by Author "Agrawal, Avitesh"

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    Investigating entrance channel effect through the measurement of neutron multiplicity in mass region a ≈200
    (2026) Agrawal, Avitesh
    In this study, we measured both the pre-scission and post-scission neutron multiplicities for the 31P + 170Er reaction at excitation energies in the range of 62-84 MeV, using the National Array of Neutron Detectors (NAND) at Inter University Accelerator Centre (IUAC), New Delhi. Theoretical calculations to reproduce the measured neutron multiplicities have been performed using the dynamical model code VECLAN. These calculations show that the dissipation strength parameter (𝛽) increases with excitation energy. Dynamical model calculations also have been performed using HICOL code to understand the fusion dynamics and formation time. It has been observed that transitioning from an asymmetric to a symmetric entrance channel leads to a gradual increase in the compoun
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    Presence of quasifission in the 30Si+176Yb reaction populating the compound nucleus 206Po
    (2025) Agrawal, Avitesh
    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.