Sprecher
Beschreibung
The analysis of the endpoint region of β-decay or electron capture decay spectra is a model independent method for the determination of the effective electron (anti-)neutrino mass. The ECHo collaboration aims to achieve this goal by building a ‘Large scale Experiment’, named ‘ECHo-LE’, with the objective of attaining — for the first time — sub-eV sensitivity on the effective neutrino mass with a ${}^{163}\textrm{Ho}$ based experiment, by realizing a high energy resolution and high statistics measurement of the electron capture spectrum in ${}^{163}\textrm{Ho}$. This new experiment will operate large metallic magnetic calorimeters enclosing $10$ $\textrm{Bq}$ ${}^{163}\textrm{Ho}$ each. More than 20,000 single pixels will be read out using the Microwave SQUID Multiplexing technique. The goal is to achieve the acquisition of more than $10^{13}$ ${}^{163}\textrm{Ho}$ events with an energy resolution better than $5 ~\textrm{eV}$ (FWHM), with two years of measurement.
We present the results obtained in the ECHo-1k experiment. The present status of the optimization of the hardware for the preparation of ECHo-LE will be summarized and the outlook towards upcoming developments will be discussed.