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A: Fachverband Atomphysik

A 35: Poster: Precision spectroscopy of atoms and ions (with Q)

A 35.28: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

Description of the Ho-163 electron capture spectrum — •Loredana Gastaldo for the ECHo collaboration — Kirchhoff Institute for Physics, Heidelberg University

The sensitivity to the neutrino mass achievable with the analysis of calorimetrically measured Ho-163 electron capture spectrum is strongly dependent on the precise understanding of the expected spectral shape. The high energy resolution calorimetric measurements of the Ho-163 spectrum performed by the ECHo collaboration pointed out that several parameters for the description of the spectral shape need to be defined with higher accuracy. Two aspects are of particular importance: the determination of Q-value, that is the value of the energy available to the decay, and the determination of the contribution to the atomic de-excitation of the daughter atom, dysprosium, of higher order processes. 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 improved theoretical models to achieve a better accuracy in the determination of the parameters describing the Ho-163 spectrum.