A possibility to produce a modulated monochromatic neutrino beam is
discussed. Monochromatic neutrinos can be obtained in electron capture by
nuclei of atoms or ions, in particular, by nuclei of hydrogen-like ions. It is
shown that monochromatic neutrino beam from such hydrogen-like ions with nuclei
of non-zero spin can be modulated because of different probabilities of
electron capture from hyperfine states. Modulation arises by means of inducing
of electromagnetic transitions between the hyperfine states. Requirements for
the hydrogen-like ions with necessary properties are discussed. A list of the
appropriate nuclei for such ions is presented.Comment: 11 pages, 1 figure, minor corrections to match the final published
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