The Spallation of Iridium With Protons of Energies 9–87 Mev

Abstract

Iridium metal has been bombarded with protons varying in energy from 8 to 87 Mev. The spallation products were radiochemically separated and decay characteristics and formation cross sections were determined. I t was confirmed that both Pt187 and Pt18%ave half-lives of about 3 hr, and a half-life of 1 3 . 3 3~ 0.2 days was found for IrlS9. An isomeric state of Irla6 with half-life 2.0f 0.5 hr has been found. Fair agreement was obtained between excitation functions for (p,xn) reactions determined experimentally and those predicted by the Jackson model.The (p,pn) yield a t 84 Mev has been compared with that calculated from Monte Carlo cascade data combined with evaporation theory and found to be too high by a factor of 4.

Cross Sections of Proton Induced Nuclear Reactions on Iridium

“…Only one earlier measurement was found which was performed in 1963 using internal irradiation, single target technique, chemical separation and NaI gamma-detector [2]. Only one earlier measurement was found which was performed in 1963 using internal irradiation, single target technique, chemical separation and NaI gamma-detector [2].…”