Temperature dependent positron annihilation studies in Nafion-117 polymer

We have measured the S-parameter and life-time as a function of temperature from 15 to 300 K in acid Nafion-117. In addition, high temperature measurements from 300 to 550 K have been carried out in acid as well as Cs neutralised Nafion membrane. The results are discussed. (C) 2000 Elsevier Science Ltd. All rights reserved

Incomplete fusion reactions: Analysis of excitation functions and recoil range distributions in 16^{16}O + 51^{51}V

Incomplete fusion reactions were investigated by measuring the excitation functions of nine evaporation residues in $^{16}$O + $^{51}$V reaction in the beam energy 4-6 MeV/amu, using the well-known recoil catcher technique and gamma-ray spectrometry. The experimental data were compared with that obtained from Monte Carlo simulation calculations using the PACE2 code. The results indicate the presence of incomplete fusion process in the production of two alpha emission products. This was further confirmed by the measurement of recoil range distribution of these isotopes at 96 MeV beam energy. Calculations of the average angular momentum associated with these products revealed the peripheral nature of these ICF reactions