Warm Dark Matter Sterile Neutrinos in Electron Capture and Beta Decay Spectra

Figure 1

Calorimeter spectrum after electron capture in . (a) Full spectrum (solid curve) and contributions: emitted neutrino phase space (dotted curve) and daughter atom deexcitation (dashed curve). (b) Full spectrum for different neutrino masses: 0, 0.5, 1, 1.5, 2, and 2.5 keV. (c) full spectrum for light ( 0 keV) - heavy ( 2 keV) neutrino mixing using a maximal mixing angle for illustration, with (solid curve) and without (dotted curve) the heavy neutrino contribution. For comparison, the spectrum without heavy neutrino mixing (dashed curve) is also shown. We use the maximal unrealistic value to make the effect visible in the scale of the figure. Realistic values of result in a reduction of the difference between the dashed and the solid lines in (c) by more than seven orders of magnitude.

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(b)

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