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Internal conversion and summing effects in heavy-nuclei spectroscopy

Abstract : Internal conversion of low-energy nuclear transitions occurs with a high probability in heavy nuclei. After the emission of the conversion electron, a cascade of X-rays, Auger or Coster–Krönig electrons takes place. In $\alpha$-decay experiments in which the nuclei of interest are implanted into a silicon detector, these atomic processes contribute to the detected energy. To understand the distortions of $\alpha$-particle energy spectra, knowledge of the various atomic yields is required. Using state-of-the-art calculations, new atomic yields are computed in $_99$Es and compared to those available in the literature. Detailed simulations of the $^{251}_{101}$Md $\alpha$ decay are performed and compared to experimental data. Possible ways to discriminate between the available atomic yields are also discussed.
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Submitted on : Tuesday, August 19, 2008 - 9:53:58 AM
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Ch. Theisen, A. Lopez-Martens, Christiane Bonnelle. Internal conversion and summing effects in heavy-nuclei spectroscopy. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2008, 589, pp.230-242. ⟨10.1016/j.nima.2008.02.044⟩. ⟨in2p3-00275392⟩



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