The Radiative and Auger Decay Properties of K-Shell Ionized Np Ions
WANG Xiang-Li1,2, DONG Chen-Zhong1**, XIE Lu-You1, SHI Ying-Long1, SABER Ismail Abdalla1, ZHOU Wei-Dong1
1Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070 2 Key Laboratory of Electronic Materials of the National Affairs Commission of China, Northwest University for Nationalities, Lanzhou 730030
Abstract：The radiative and Auger decay processes of K-shell ionized Np ions are studied theoretically using the flexible atomic code (FAC). Relativistic effects, Breit interaction, QED corrections and nuclear finite mass and volume effects are considered systematically. The resulting calculated K x-rays and Auger spectra of Np are compared with the measured spectra emitted after the electron-capture (EC)-decay of mass-separated 237Pu. The general consistency between theory and experiment is good; the relative intensities and relative positions of the peaks in the measured spectra are reproduced with good accuracy, in spite of the existence of different ways to produce the primary K-shell vacancy, enabling identification of the observed structure in the experimental spectra. We find that most of the radiative transition rates are greater than the Auger transition rates, and the latter decrease rapidly with the transfer of initial vacancies to the outer shell.
2012, Vol. 29 
