We report here the preparation of an experiment to measure the electronic a
nti-neutrino mass by studying the Re-187 end-point with high-resolution the
rmal microcalorimeters. We present the results achieved up to now with seve
ral AgReO4 microcalorimeter prototypes and we discuss the experiment perspe
ctive regarding both the detector performances and the achievable neutrino
mass sensitivity. (C) 2000 Elsevier Science B.V. All rights reserved.