Elastic scattering, transfer reactions, and fission induced by <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">O</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>16</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math> ions on <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Ta</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>181</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Pb</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>208</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math>

F. Videbæk; R. B. Goldstein; L. Grodzins; S. G. Steadman; T. A. Belote; J. D. Garrett

doi:10.1103/PhysRevC.15.954

Elastic scattering, transfer reactions, and fission induced by ${}^{16}O$ ions on ${}^{181}{Ta}$ and ${}^{208}{Pb}$

F. Videbæk, R. B. Goldstein, L. Grodzins, S. G. Steadman, T. A. Belote, and J. D. Garrett

Phys. Rev. C 15, 954 – Published 1 March 1977

Abstract

Total cross sections for the quasielastic and fission channels in reactions of ${}^{16}O$ on ${}^{181}{Ta}$ and ${}^{208}{Pb}$ were measured as a function of the incident energy near the Coulomb barrier. For ${}^{208}{Pb}$ , the fission and quasielastic components account for essentially all of the total reaction cross sections as deduced from the elastic scattering. However, for ${}^{181}{Ta}$ , the fission and quasielastic components account for only about 25% of the total cross section as deduced from elastic scattering. The fission fragment angular distributions for ${}^{208}{Pb}$ are analyzed with a simple statistical approach yielding an effective moment of inertia at the saddle point compatible with the liquid-drop-model prediction. Fission excitation functions for ${}^{181}{Ta}$ are described reasonably well by a statistical evaporation code.

NUCLEAR REACTIONS Ta( ${}^{16}O$ , ${}^{16}O$ ), ( ${}^{16}O$ , ${}^{17}O$ ), ( ${}^{16}O$ , ${}^{15}N$ ), ( ${}^{16}O$ , C), ( ${}^{16}O$ , $f$ ), $E_{L} = 83, 90, 96$ MeV. ${}^{208}{Pb}$ ( ${}^{16}O$ , ${}^{16}O$ ), ( ${}^{16}O$ , ${}^{17}O$ ), ( ${}^{16}O$ , ${}^{15}N$ ), ( ${}^{16}O$ , C) $E_{L} = 80, 83, 88, 90, 96, 102$ MeV, measured $σ (θ, E)$ . $Ta ({}^{16}O, f)$ $E_{L} = 77 - 102$ MeV, measured $σ (E)$ ; deduced optical-model parameters, total reaction cross sections; enriched targets.