Fission-like events in the C12+Tm169 system at low excitation energies

Arshiya Sood, Pushpendra P. Singh, Rudra N. Sahoo, Pawan Kumar, Abhishek Yadav, Vijay R. Sharma, Mohd. Shuaib, Manoj K. Sharma, Devendra P. Singh, Unnati Gupta, R. Kumar, S. Aydin, B. P. Singh, H. J. Wollersheim, and R. Prasad
Phys. Rev. C 96, 014620 – Published 28 July 2017

Abstract

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., Elab6.4, 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 γ spectroscopy was used to measure production cross sections of fission-like events. The evaporation residues were identified by their characteristic γ 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 (32Z49) 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 γ 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.

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  • Received 26 May 2017

DOI:https://doi.org/10.1103/PhysRevC.96.014620

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Arshiya Sood1,*, Pushpendra P. Singh1,†, Rudra N. Sahoo1, Pawan Kumar1, Abhishek Yadav2, Vijay R. Sharma2, Mohd. Shuaib7, Manoj K. Sharma3, Devendra P. Singh4, Unnati Gupta5, R. Kumar2, S. Aydin6, B. P. Singh7, H. J. Wollersheim1,8, and R. Prasad7

  • 1Department of Physics, Indian Institute of Technology Ropar, Rupnagar 140 001, Punjab, India
  • 2Inter-University Accelerator Center, New Delhi 110 067, India
  • 3Department of Physics, S. V. College, Aligarh 202 001, Uttar Pradesh, India
  • 4Department of Physics, University of Petroleum and Energy Studies, Dehradun 248 007, Uttarakhand, India
  • 5Department of Physics, Delhi University, New Delhi 110 067, India
  • 6Department of Physics, University of Aksaray, Aksaray, Turkey
  • 7Department of Physics, A. M. University, Aligarh 202 002, Uttar Pradesh, India
  • 8GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt, Germany

  • *arshiya.sood@iitrpr.ac.in
  • pps@iitrpr.ac.in

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Vol. 96, Iss. 1 — July 2017

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