Background analysis and reduction for the ECHo experiment

14th International Conference on Topics in Astroparticle and Underground Physics

物理学;天文学

Scholl, Stephan^1

Kepler Center for Astro and Particle Physics, Eberhard-Karls-Universität Tübingen, Auf der Morgenstelle 14, Tübingen

72076, Germany^1

关键词: Background analysis;    Background spectra;    Calorimetric measurements;    Electron capture;    Electron neutrino;    GEANT4 simulation;    Low background;    Measurements of;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/718/6/062051/pdf
DOI  :  10.1088/1742-6596/718/6/062051

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

ECHo-lk is a new experiment which is designed to investigate the electron neutrino mass from the calorimetric measurement of the electron capture spectrum of163Ho. In this presentation, we give an overview of our recent activities in the background analysis and reduction. Low background measurements of the radiopurity of the implanted Holmium in the ECHo detectors have been used to constrain the maximum activity of166mHo in the sample to be less than ∼ 0.4 mBq. On top of this, the background spectrum introduced by coimplanted166Ho in the absorber of the ECHo detectors has been obtained with a GEANT4 simulation showing that if the projected reduction of coimplanted166mHo to163Ho of 10-10can be achieved, the background contribution of166mHo is negligible. Additional GEANT4 based Monte-Carlo simulations of test contaminations have been conducted. Simulations have been completed for internal210Pb contamination in the absorber and55Fe contaminations on the surface of the absorber.