The Electron Capture Decay of 163-Ho to Measure the Electron Neutrino   Mass with sub-eV Accuracy (and Beyond)
  We have investigated the possibility of measuring the electron neutrino mass with sub-eV sensitivity by studying the electron capture decay of 163-Ho with cryogenic microcalorimeters. In this paper we will introduce an experiment's concept, discuss the technical requirements, and identify a roadmap to reach a sensitivity of 0.1 eV and beyond. 
Massimiliano Galeazzi, Flavio Gatti, Maurizio Lusignoli, Angelo   Nucciotti, Stefano Ragazzi, Maria Ribeiro Gomes
physics.ins-det astro-ph.IM hep-ex