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Keywords:

  • Penning-trap mass spectrometry;
  • neutrinos;
  • neutrino mass;
  • neutrino oscillometry;
  • sterile neutrinos;
  • neutrinoless double-electron capture

Rapidly developing neutrino physics has found in Penning-trap mass spectrometry a staunch ally in investigating a variety of fundamental problems. The most familiar are the absolute neutrino mass, possible existence of resonant neutrinoless double-electron capture and of keV-sterile neutrinos, and investigation of neutrino oscillations. This article is a brief review of the latest achievements and future perspectives of Penning-trap mass spectrometry in the exploration of these problems with a focus on electron capture and double electron capture processes.