Excitation Functions of Bismuth and Lead

Cross sections for the reactions Bi²⁰⁹(He⁴, 2n)At²¹¹, Bi²⁰⁹(He⁴, 3n)At²¹⁰, and Bi²⁰⁹(He⁴, 4n)At²⁰⁹ were measured with helium ions of energies from 20.6 to 43.3 Mev. Cross sections for the reactions Bi²⁰⁹(d, p)RaE, Bi²⁰⁹(d, n)Po²¹⁰, Bi²⁰⁹(d, 2n)Po²⁰⁹, Bi²⁰⁹(d, 3n)Po²⁰⁸, and Pb²⁰⁸(d, p)Pb²⁰⁹ were measured with deuterons of energies from 6.3 to 21.5 Mev. Some information is presented on the Bi²⁰⁹(He⁴, t)Po²¹⁰ reaction. A half-life of 7.23±0.04 hr was measured for At²¹¹. The Bi²⁰⁹(d, 3n)Po²⁰⁸ threshold energy is 12.0±0.3 Mev (center-of-mass system). The compound nucleus reaction cross sections are compared with the predictions of the Jackson model, and good agreement is obtained. The (d, n) and (d, p) stripping cross sections are discussed briefly.