DOUBLE K-SHELL IONIZATION ACCOMPANYING THE INTERNAL-CONVERSION OF THE 0.145-MEV TRANSITION IN PR-141

Double ionization of the atomic K shell accompanying the K-shell internal conversion of the 0.145-MeV transition of Pr141 has been studied by recording coincidences between K satellite x rays and K hypersatellite x rays emitted when the double vacancies are filled. The probability per K-shell internal conversion that a double vacancy is formed, PKK(IC), was found to be (3.4 0.3)×10-5, which is a factor of (0.79 0.07) times the theoretical prediction for K-shell electron shakeoff in K-shell internal conversion of Mukoyama and Shimizu. The K 1 to K 2 hyper- satellite ratio was found to be (1.50 0.13), a value which is about 6% less than the calculation of Aberg et al. © 1985 The American Physical Society.