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    Entrance channel effect on incomplete fusion
    (Jagellonian University, 2018) Sahoo, Rudra N.; Kaushik, Malika; Sood, Arshiya; Kumar, Pawan Santhosh Ashok; Sharma, Vijay Raj; Yadav, Abhishek; Shuaib, Mohd; Aydın, Sezgin
    In the present work, the onset and strength of incomplete fusion were studied in terms of various entrance channel parameters. Excitation functions for individual evaporation residues were measured in the 12C+169Tm system at energies from 5 to 7.5AMeV, and analysed in the framework of the statistical model code PACE-IV to deduce the fraction of incomplete fusion. It was found that the probability of incomplete fusion increases with the incident energy as well as with the mass asymmetry of interacting partners for individual projectiles. Moreover, the critical value of the input angular momentum (lcrit) obtained from the experimental cross sections was compared with that calculated using the Wilczynski formula and a slight difference has been found. © 2018 Jagellonian University. All rights reserved.
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    Entrance channel effects on fission fragment mass distribution in 12 C+ 169 Tm system
    (Jagellonian University, 2019) Sood, Arshiya; Kumar, Pawan Santhosh Ashok; Sahoo, Rudra N.; Singh, Pushpendera P.; Yadav, Abhishek; Sharma, Vijay Raj; Sharma, Manoj Kumar; Aydın, Sezgin
    With an aim to study different aspects of heavy-ion induced reactions following the evolution of compound nucleus formed via complete and/or incomplete fusion, the production cross sections of evaporation residues and fission-like fragments were measured in 12 C+ 169 Tm reaction at E lab = 77.18, 83.22, and 89.25 MeV. The recoil-catcher activation technique followed by offline ? spectroscopy was employed to measure the cross sections. Herein, we present the production cross sections of 26 fission-like fragments identified in this work. An attempt has been made to study the isotopic yield distribution and the mass distribution of fission-like fragments to discern various reaction mechanisms. The mass distribution of fission-like fragments was found to be symmetric and broad substantiating their formation from compound nuclear processes. The mass variances (? M 2 ) has been found to increase monotonically with excitation energy above the Coulomb barrier for deformed 169 Tm target, and with increase in mass asymmetry of the system. © 2019 Jagellonian University. All Rights Reserved.
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    Fission-like events in the C 12 + Tm 169 system at low excitation energies
    (American Physical Society, 2017) Sood, Arshiya; Singh, Pushpendera P.; Sahoo, Rudra N.; Kumar, Pawan S.Ashok; Yadav, Abhishek; Sharma, Vijay Raj; Shuaib, Mohd; Aydın, Sezgin
    Background: Fission has been found to be a dominating mode of deexcitation in heavy-ion induced reactions at high excitation energies. The phenomenon of heavy-ion induced fission has been extensively investigated with highly fissile actinide nuclei, yet there is a dearth of comprehensive understanding of underlying dynamics, particularly in the below actinide region and at low excitation energies. Purpose: Prime objective of this work is to study different aspects of heavy-ion induced fission ensuing from the evolution of composite system formed via complete and/or incomplete fusion in the C12+Tm169 system at low incident energies, i.e., Elab?6.4, 6.9, and 7.4 A MeV, as well as to understand charge and mass distributions of fission fragments. Method: The recoil-catcher activation technique followed by offline ? spectroscopy was used to measure production cross sections of fission-like events. The evaporation residues were identified by their characteristic ? rays and vetted by the decay-curve analysis. Charge and mass distributions of fission-like events were studied to obtain dispersion parameters of fission fragments. Results: In the present work, 26 fission-like events (32?Z?49) were identified at different excitation energies. The mass distribution of fission fragments is found to be broad and symmetric, manifesting their production via compound nuclear processes. The dispersion parameters of fission fragments obtained from the analysis of mass and isotopic yield distributions are found to be in good accord with the reported values obtained for different fissioning systems. A self-consistent approach was employed to determine the isobaric yield distribution. Conclusions: The present work suggests that fission is one of the competing modes of deexcitation of complete and/or incomplete fusion composites at low excitation energies, i.e., E*?57, 63, and 69 MeV, where evaporation of light nuclear particle(s) and/or ? rays are assumed to be the sole contributors. A single peaked broad Gaussian mass dispersion curve has corroborated the absence of any noncompound nuclear fission at the studied energies. © 2017 American Physical Society.
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    Insights into the low energy incomplete fusion
    (Elsevier B.V., 2019) Sahoo, Rudra N.; Kaushik, Malika; Kumar, Pawan S.Ashok; Sood, Arshiya; Sharma, Vijay Raj; Yadav, Abhishek; Singh, Pushpendera P.; Aydın, Sezgin
    In the present work, channel-by-channel excitation functions of different evaporation residues populated via complete and/or incomplete fusion in C12+169Tm system have been measured for an energy range Elab?53–90MeV, using recoil-catcher activation technique followed by off-line ?-spectroscopy. Experimentally measured excitation functions have been analysed in the framework of statistical model code PACE. To probe the effect of entrance-channel parameters on the onset and strength of incomplete fusion, relative contributions of complete and incomplete fusion have been deduced from the analysis of experimentally measured excitation functions. The percentage fraction of incomplete fusion deduced from the analysis of excitation functions has been studied in terms of incident energy, entrance-channel mass-asymmetry, ground state alpha-Q-value, neutron skin thickness of target nuclei, and nuclear potential parameters. It has been found that incomplete fusion start competing with complete fusion even at slightly above barrier energies where complete fusion is assumed to the sole contributor. The probability of incomplete fusion increases with incident energy, entrance channel mass-asymmetry, large negative ground state alpha-Q-value, neutron skin thickness, and nuclear potential parameters for individual projectiles.