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Role of quasifission in fission fragment mass distributions for the Si28+Au197 reaction

Nishant Kumar, D. C. Biswas, T. K. Ghosh, J. Sadhukhan, B. N. Joshi, Y. K. Gupta, R. P. Vind, G. K. Prajapati, Shradha Dubey, L. S. Danu, S. Mukhopadhyay, K. Mahata, B. V. John, and S. Sodaye
Phys. Rev. C 99, 041602(R) – Published 22 April 2019

Abstract

Fission fragment mass distribution has been measured for Si28+Au197 reaction at bombarding energies around the Coulomb barrier (Vb=126.5MeV). The experimental variance of the mass distribution shows a sudden change from monotonic decrease to a saturation at energies close to the Coulomb barrier and again a decreasing trend at sub-barrier energies. The variance of the mass distribution was also obtained from dynamical and statistical model calculations for the fission of a fully equilibrated compound nucleus. Both of the theoretical calculations show a monotonic change of the mass variance around the Coulomb barrier. The anomalous dependence of fission fragment mass width at energies around the barrier may be due to the dominance of the quasifission process as compared to compound nuclear fission.

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  • Received 3 October 2018
  • Revised 6 February 2019

DOI:https://doi.org/10.1103/PhysRevC.99.041602

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Nishant Kumar1,5, D. C. Biswas1,5,*, T. K. Ghosh2,5, J. Sadhukhan2,5, B. N. Joshi1, Y. K. Gupta1,5, R. P. Vind1, G. K. Prajapati1,5, Shradha Dubey1,3, L. S. Danu1,5, S. Mukhopadhyay1, K. Mahata1,5, B. V. John1,5, and S. Sodaye4,5

  • 1Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
  • 2Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata 700064, India
  • 3Physics Department, Faculty of Science, M.S. University of Baroda, Vadodara 390002, India
  • 4Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
  • 5Homi Bhabha National Institute, Mumbai 400094, India

  • *Corresponding author: dcbiswas@barc.gov.in

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Issue

Vol. 99, Iss. 4 — April 2019

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