Kβ to Kα X-ray intensity ratio and K-L vacancy transfer probability of Mn following electron capture decay

K α and K β X-rays of Mn following electron capture (EC) decay of 55 Fe were detected using Amptek XR-100 T-CdTe X-ray detector spectrometer. Measured K α and K β X-ray intensities of Mn were used to determine the K β to K α intensity ratio and total K–L total vacancy transfer probability. These values were compared with the theoretical, semiempirical, and others’ experimental values obtained via EC decay as well as photoionization. The X-ray intensity ratio of Mn was found to be higher by 1.5% from the relativistic Hartree-Slater theoretical value. This deviation may be attributed to the exchange interactions occurring between the 3p and 3d shell electrons as well as the recoil effect of the nucleus due to neutrino emission.