A5036320117- Nuclear physics research studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Nuclear reactor physics and engineering
- Atomic and Molecular Physics
- Quantum Chromodynamics and Particle Interactions
- Nuclear Materials and Properties
- Rare-earth and actinide compounds
- Cold Fusion and Nuclear Reactions
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Laser-Plasma Interactions and Diagnostics
University of Delhi
2022-2025
Bhabha Atomic Research Centre
2017-2023
Inter-University Accelerator Centre
2020-2022
University of Calicut
2022
Central University of Kerala
2021
University of Mumbai
2017-2019
Banaras Hindu University
2019
Maharaja Sayajirao University of Baroda
2012-2014
Complete fusion cross sections for ${}^{7}$Li+${}^{144,152}$Sm reactions have been measured at energies around the Coulomb barrier by offline $\ensuremath{\gamma}$-counting technique. Measured above two are found to be similar well barrier, however, sub-barrier ${}^{7}$Li+${}^{152}$Sm system much higher compared ${}^{7}$Li+${}^{144}$Sm system, manifesting effect of target deformation. Cross present above-barrier larger than previously involving ${}^{6}$Li projectile with same targets,...
Inclusive breakup $\ensuremath{\alpha}$ cross sections (${\ensuremath{\sigma}}_{\ensuremath{\alpha}}^{\mathrm{incl}}$) are measured for the ${}^{6}$Li + ${}^{209}$Bi reaction at bombarding energies ${E}_{\mathrm{lab}}=24$--50 MeV. The ${\ensuremath{\sigma}}_{\ensuremath{\alpha}}^{\mathrm{incl}}$ was observed to be a substantial fraction of total section over entire energy range, and it exhausts almost whole sub-barrier energies. An investigation on origin large inclusive reveals that most...
Background: Heavy-ion fusion cross-sections at sub barrier energies are found to be enhanced by orders of magnitude as compared the predictions one-dimensional penetration model (1-D BPM). The coupling various internal degrees freedom has been employed decrypt mechanism responsible for observed sub-barrier enhancement. However, unambiguous role multi-neutron transfer channels in domain is still elusive.Purpose: We aim explore and disentangle effects from inelastic excitations vicinity...
Background: In heavy-ion-induced fusion reactions, cross sections in the sub-barrier region are enhanced compared to predictions of one-dimensional barrier penetration model. This enhancement is often understood by invoking deformation and coupling relative motion with low-lying inelastic states reaction partners. However, effects nucleon transfer on below barrier, especially for systems having positive $Q$ value neutron (PQNT) channels, yet be disentangled completely.Purpose: We intend...
Background: The measured subbarrier fusion cross sections in heavy-ion reactions are found to be significantly large as compared with those expected from the one-dimensional barrier penetration model (1d-BPM). Although attempts have been made comprehend enhancement terms of different intrinsic degrees freedom colliding nuclei, a clear understanding same is yet come.Purpose: objectives this study understand interplay channel coupling effect on excitation function and explore decay dynamics...
Several experimental investigations have reported evidence of collective enhancement the nuclear level density and its fadeout. However, a suitable method is needed for determination factor as function excitation energy. In this study, neutron spectra were measured in coincidence with evaporated $\ensuremath{\alpha}$ particles produced reactions $^{11}\mathrm{B}+^{181}\mathrm{Ta},^{197}\mathrm{Au}$. The parameter has been extracted...
The $^{59}\mathrm{Ni}(n,xp)$ reaction cross sections have been measured following the surrogate ratio method in equivalent neutron energy range of 11.9--15.8 MeV by populating compound nucleus $^{60}\mathrm{Ni}^{*}$ through transfer $^{56}\mathrm{Fe}(^{6}\mathrm{Li},d)$ at ${E}_{\text{lab}}=35.9$ MeV. $^{59}\mathrm{Co}(^{6}\mathrm{Li},\ensuremath{\alpha})^{61}\mathrm{Ni}^{*}$ ${E}_{\text{lab}}=40.5$ has used as reference which is $^{60}\mathrm{Ni}(n,xp)$ $^{61}\mathrm{Ni}^{*}$. proton decay...
Background: The relevance of including channel coupling effects in the form target deformation and vibration fusion reactions has been well established. Many with positive $Q$ values for neutron transfer show enhancement sub-barrier cross sections. However, there are exceptions to these cases.Purpose: We aim make a comprehensive list factors influencing systems channels having values.Method: Evaporation residue sections were measured $^{18}\mathrm{O}+^{182,184,186}\mathrm{W}$ energy range...
Fission fragment (FF) angular distributions for ${}^{6,7}\mathrm{Li}+^{235,238}\mathrm{U}$ reactions have been measured at energies near and above the Coulomb barrier. The angle integrated fission cross sections $^{6}\mathrm{Li}$ induced sub-barrier are found to be higher than $^{7}\mathrm{Li}$ possibly due a larger contribution of breakup or transfer in cases former compared latter. FF anisotropies $^{6,7}\mathrm{Li}+^{235}\mathrm{U}$ slightly smaller $^{6,7}\mathrm{Li}+^{238}\mathrm{U}$,...
In the present work, pre- and post-scission neutron multiplicities were measured for reaction $^{18}\mathrm{O}+^{186}\mathrm{W}$ at different excitation energies populating compound nucleus $^{204}\mathrm{Pb}$, using National Array of Neutron Detectors (NAND) facility IUAC, New Delhi, India. Here, we investigated entrance channel effect on nuclear dissipation involved in heavy ion fusion-fission dynamics. The statistical model analysis was performed code vecstat. prescribed had similar value...
Measurements of cross sections evaporation residue (ER) and spin distributions heavy nuclei, produced via compound nuclear fusion-evaporation reactions, provide crucial information about the dynamics fission survival probability system against fission. Such measurements help in probing evolution from equilibrium to saddle underlying role dissipation hindering The purpose present is understand 224Th∗ nucleus its dependence on angular momentum. ER have been carried out for 16O+208Pb 18O+206Pb...
The $^{54}\mathrm{Mn}^{*}$ (surrogate of $n+^{53}\mathrm{Mn}$) and $^{61}\mathrm{Ni}^{*}$ $n+^{60}\mathrm{Ni}$) compound systems have been populated at overlapping excitation energies by transfer reactions $^{52}\mathrm{Cr}(^{6}\mathrm{Li},\ensuremath{\alpha})^{54}\mathrm{Mn}^{*}$ ${E}_{\mathrm{lab}}=33.0\phantom{\rule{0.28em}{0ex}}\mathrm{MeV}$ $^{59}\mathrm{Co}(^{6}\mathrm{Li},\ensuremath{\alpha})\phantom{\rule{0.16em}{0ex}}^{61}\mathrm{Ni}^{*}$...
Abstract The pre-scission and post-scission neutron multiplicities are measured for the 18 O + 184 W reaction in excitation energy range of 67.23–76.37 MeV. Langevin dynamical calculations performed to infer dependence fission decay time compliance with multiplicities. Different models nuclear dissipation employed this purpose. Fission process is usually expected be faster at a higher beam energy. However, we found an enhancement average as incident increases. It happens because helps more...
Background: Enhancement in fusion cross sections over one-dimensional barrier penetration model (1D-BPM) predictions has been observed at sub-barrier energies owing to the coupling of various internal degrees freedom relative motion. On other hand, hindrance is noticed well above a few cases.Purpose: The purpose probe dynamics heavy ion below and Coulomb barrier.Methods: Fusion excitation functions for $^{16}\mathrm{O}+^{142,150}\mathrm{Nd}$ reactions are measured using Heavy Ion Reaction...
Barrier distributions for the $^{28}\mathrm{Si}+^{142,150}\mathrm{Nd}$ systems were extracted from large-angle quasielastic scattering measurements. The measurements carried out over a wide range of incident beam energies around Coulomb barriers. experimental results compared with predictions coupled-channels calculations using different coupling schemes. Reasonable agreement between and theoretical was obtained. role effects various excitation modes projectile target on observed barrier is...
Background: The coupled-channels model has been highly successful in interpreting experimental subbarrier fusion. statistical framework traditionally used to explain the basic features of composite system de-excitation above Coulomb barrier region. However, $^{12}\mathrm{C}$-induced reactions with $^{182,186}\mathrm{W}$, measured fusion cross sections are significantly lower than those predicted by various theoretical models and systematics.Purpose: To investigate dynamics heavy ion at...
Enhancement of fusion cross sections below the interaction barrier has been quite successfully explained by coupled-channels methods. However, extending measurements to deep sub-barrier energies revealed a steeper descent excitation function which could not be standard calculations. Though large number heavy-ion and light-ion induced reactions have investigated understand dynamics barrier, phenomenon hindrance studied only for handful asymmetric systems. We report new functions systems 16 O+...
Evaporation residue (ER) cross sections and ER-gated $\ensuremath{\gamma}$-ray fold distributions are measured for the $^{32}\mathrm{S}+^{154}\mathrm{Sm}$ nuclear reaction above Coulomb barrier at six different beam energies from 148 to 191 MeV. multiplicities spin extracted distributions. The ER in present work found be much higher than what was reported a previous using very target-projectile $(^{48}\mathrm{Ti}+^{138}\mathrm{Ba})$ combination, leading same compound nucleus...