TY  - GEN
Y1  - 2014///
ID  - heidok17462
KW  - neutrino mass measurement
KW  -  ECHo-Experiment
KW  -  metallic magnetic calorimeter
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/17462/
AV  - public
A1  - Ranitzsch, Philipp Chung-On
TI  - Development and characterization of metallic magnetic calorimeters for the calorimetric measurement of the electron capture spectrum of 163Ho for the purpose of neutrino mass determination
N2  - The electron capture process of 163Ho offers a unique tool for the determination of the neutrino mass due to its low end-point energy Q_EC.
In this work a metallic magnetic calorimeter with an embedded 163Ho source was characterized and used to measure the calorimetric spectrum of the 163Ho decay.
The characterization revealed that neither the thermodynamic properties nor the detector performance were impaired by the presence or the ion-implantation process of the 163Ho source. Furthermore an energy resolution of Delta E_FWHM = 7.3 eV and rise times as low as tau_0 = 80 ns were measured.
The discussed detector achieved the presently best energy resolution for the measurement of the 163Ho electron capture spectrum. For the first time the de-excitation of an electron capture from the 163Ho O1-level at E_O1 = 48eV has been observed. The parameters describing the spectrum could be extracted from the measured spectra. One of the most important parameters, namely the end-point energy has been determined to Q_EC = (2.877 ± 0.022 (stat.) +0 - 0.06 (syst.)) keV. This implies that the achieved detector performance is suited for a neutrino mass experiment based on 163Ho.
ER  -