Recent results of measurements of evaporation residue excitation functions for ¹⁹F+^194,196,198Pt and ^16,18O+¹⁹⁸Pt systems with HYRA spectrometer at IUAC

Department of Physics, Panjab University, Chandigarh 160014, India

^a Corresponding author: bivash@pu.ac.in

Published online: 29 January 2015

Abstract

In this talk results of the evaporation residue (ER) cross sections for the ¹⁹F+^194,196,198Pt (forming compound nuclei ^213,215,217Fr) and ^16,18O+¹⁹⁸Pt (forming compound nuclei ^214,216Rn) systems measured at Hybrid Recoil mass Analyzer (HYRA) spectrometer installed at the Pelletron+LINAC accelerator facility of the Inter University Accelerator Center (IUAC), New Delhi are reported. The survival probabilities of ²¹⁵Fr and ²¹⁷Fr with neutron numbers N = 126 are found to be lower than the survival probabilities of ²¹⁵Fr and ²¹⁷Fr with neutron numbers N = 128 and 130 respectively. Statistical model analysis of the ER cross sections show that an excitation energy dependent scaling factor of the finite-range rotating liquid drop model fission barrier is necessary to fit the experimental data. For the case of ^214,216Rn, the experimental ER cross sections are compared with the predictions from the statistical model calculations of compound nuclear decay where Kramer’s fission width is used. The strength of nuclear dissipation is treated as a free parameter in the calculations to fit the experimental data.