Evaluation of the resonance enhancement effect in neutrinoless   double-electron capture in 152Gd, 164Er and 180W atoms
  We study the resonant neutrinoless double-electron capture (0nECEC) in 152Gd, 164Er and 180W atoms, associated with the ground-state to ground-state nuclear transitions. The corresponding matrix elements are calculated within the deformed QRPA using the realistic Bonn-CD nucleon-nucleon interaction. The half-lives are estimated with the use of the most recent precision data on the Q-values of these processes. Perspectives of experimental search for the 0nECEC with the isotopes 152Gd, 164Er and 180W are discussed. 
Dong-Lianf Fang, K. Blaum, S. Eliseev, Amand Faessler, M. I.   Krivoruchenko, V. Rodin, F. Simkovic
hep-ph nucl-th