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Anomalous increase in width of fission-fragment mass distribution as a probe for onset of quasifission reactions in deformed target-projectile system at near and sub-barrier energies

T. K. Ghosh, S. Pal, T. Sinha, S. Chattopadhyay, P. Bhattacharya, D. C. Biswas, and K. S. Golda
Phys. Rev. C 70, 011604(R) – Published 26 July 2004

Abstract

Fission-fragment mass distribution has been studied for the O16+Th232,Bi209 systems over an energy range of 102.878.6MeV and 81.672.6MeV, respectively, in a laboratory frame. The variance of the mass distribution (σm2) for the O16+Bi209 system varies linearly with center of mass energy, while a significant anomalous behavior is found for the system O16+Th232. Coupled with our earlier observation for the system F19+Th232 [T. K. Ghosh et al., Phys. Rev. C 69, 031603(R) (2004)], we propose that the accurate measurement of mass distribution is a powerful tool to look for the onset of a nonstatistical reaction mechanism in heavy-ion-induced fission of deformed heavy nuclei.

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  • Received 14 June 2004

DOI:https://doi.org/10.1103/PhysRevC.70.011604

©2004 American Physical Society

Authors & Affiliations

T. K. Ghosh, S. Pal, T. Sinha, S. Chattopadhyay, and P. Bhattacharya

  • Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata 700 064, India

D. C. Biswas

  • Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India

K. S. Golda

  • Nuclear Science Centre, New Delhi 110067, India

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Vol. 70, Iss. 1 — July 2004

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