Excitation function measurement and reaction mechanism analysis for alpha-induced reactions on

Abstract

Excitation functions have been measured for 200,199,197,196 Tl and 195,194 Au produced by α-particle-induced reactions on 197 Au in the incident energy range 34-50 MeV. The excitation functions of these nuclei and those of 198 Tl, 197 Hg, 198,196 Au, reported earlier, are analysed in terms of direct, pre-equilibrium and evaporation emissions. The two most commonly used models of pre-equilibrium reactions, the exciton and the hybrid models, have both been used and compared. The choice of the initial exciton number, the role of the pre-equilibrium cluster and multiple nucleon emissions have been investigated. The direct emission of clusters are found to significantly affect the excitation functions of 197 Hg and Au isotopes.

Cross sections and thermonuclear reaction rates for181Ta(alpha,n)184Re,169Tm(alpha,n)172Lu,191Ir(alpha,n)194Au and197Au(alpha,n)200Tl

“…We have therefore measured these cross sections again. There is also a lack of experimental data for (α, n) reactions induced in other nuclei in this atomic mass region [1], and new measurements have been performed recently for gold [9]. To complete this study, we calculated cross sections with the SCAT II [10] and STAPRE [11] codes, with and without pre-equilibrium emission.…”