Bochum 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HK: Fachverband Physik der Hadronen und Kerne
HK 49: Astroparticle Physics II and Applications
HK 49.3: Vortrag
Donnerstag, 1. März 2018, 15:00–15:15, HZO 100
The electron capture in 163Ho experiment - ECHo — •Loredana Gastaldo for the ECHo collaboration — Kirchhoff-Institut für Physik, Universität Heidelberg
Direct determination of the electron neutrino m(νe) and anti-neutrino mass m(νe) can be obtained by the analysis of electron capture and beta spectra respectively. In the last years, experiments analysing the 3H beta spectrum reached a limit on m(νe) of 2 eV. The upper limit on m(νe) is still two orders of magnitudes higher, at 225 eV. The Electron Capture in 163Ho experiment, ECHo, is designed to investigate m(νe) in the sub-eV region and reach the same sensitivity as foreseen for m(νe) in new 3H-based experiments. In ECHo, high sensitivity on a finite m(νe) will be reached by the analysis of the endpoint region in high statistics and high resolution calorimetrically measured 163Ho spectra. To perform this experiment, high purity 163Ho source will be enclosed in a large number of low temperature metallic magnetic micro-calorimeters which are readout using the microwave multiplexing technique. This approach allows for a very good energy resolution, below Δ EFWHM < 5 eV and for a fast time resolution well below 1 µs. Thanks to the modular approach, the ECHo experiment is designed to be stepwise up-graded. The first on-going phase, ECHo-1k, is characterized by a 163Ho activity of about 1 kBq enclosed in about 100 pixels. The statistics of 1010 events in the 163Ho spectrum will allow to improve the limit on m(νe) by more than one order of magnitude. In this talk, the present status of the ECHo-1k experiment will be discussed as well as the plans for the next phase, ECHo-100k.