Speaker
Martin Braß
(Institut für theoretische Physik Uni Heidelberg)
Description
The determination of the electron neutrino mass by electron capture (EC) in $^{163}$Ho relies on a precise understanding of the deexcitation of a core hole after an EC event. Our ab initio calculation of the EC spectrum of $^{163}$Ho includes all intra-atomic decay channels and many-body interactions on a basis of relativistic bound-orbitals. Many-body Coulomb interactions result in the formation of multiplets and additional peaks corresponding to multiple core-holes created via Auger decay. Multiplets change the appearance of the resonances on a Rydberg energy scale. These additional structures do not directly influence the statistics for determining the neutrino mass, as the spectral end-point is affected mostly by the mass itself. The multiplet broadening and Auger shake-up of the main core-level edges do change the apparent line-width and accompanying lifetime of these edges. Fitting core level edges by a single resonance thus leads to an underestimation of the core hole lifetime.
| Session and Location | Monday Session, Poster Wall #10 (Robert-Schumann-Room) |
|---|---|
| Poster included in proceedings: | yes |
Primary author
Martin Braß
(Institut für theoretische Physik Uni Heidelberg)
Co-authors
Dr
Loredana Gastaldo
(Kirchhoff-Institut für Physik, Universität Heidelberg)
Prof.
Maurits Haverkort
(Institute for theoretical physics - heidelberg university)
