Abstract
Publisher Summary This chapter discusses the X-Ray yields from K-shell ionization by alpha particles. The K-ionization probability is determined from the measurement of K X-ray yield in the two detectors, one at 54° and the other at 234°. In the deformed nuclei where a gamma ray is also emitted due to Coulomb excitation, along with the K X-rays, the contribution of the X-rays due to internal conversion is determined by measuring the total area under the gamma photopeak and by using the theoretical values of internal conversion coefficients. Suitable corrections were made for the escape peak, absorption in the source material, source backing and crystal package, scattering from the surroundings, dead time of the multichannel analyzer, and the photoefficiency of the NaI (T1) crystal. The contribution of the scattering from the surroundings is also determined by absorbing the direct rays in a suitably graded shadow shield. The data reviews that no nuclear structure effects on the K-ionization probability are observed for α-particles of 3 to 4 MeV energy.
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