Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 30: Precision spectroscopy of atoms and ions (with Q)

A 30.8: Poster

Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof

High precision measurement of the Ho-163 electron capture spectrum — •Gastaldo Loredana for the ECHo Collaboration — Kirchhoff-Institut für Physik, Universität Heidelberg, INF 227, 69120 Heidelberg, Germany

The sensitivity to the neutrino mass achievable with the analysis of the calorimetrically measured electron capture spectrum of Ho-163 is strongly dependent on the precise understanding of the expected spectral shape. Already at the level of energy resolution that is presently achieved in the ECHo experiment for the Ho-163 spectrum it is obvious that several parameters for the theoretical description of the spectral shape need to be defined with higher accuracy. The determination of higher order processes to the atomic de-excitation within the daughter atom dysprosium might play an important role for achieving sub-eV sensitivity on the electron neutrino mass. We compare the parameters obtained by the analysis of the calorimetrically measured Ho-163 spectrum with the ones available in literature and discuss the discrepancies with present models and available data. We present new experimental methods and discuss recently theoretical models to achieve a better accuracy in the determination of the parameters describing the Ho-163 spectrum.