Non-observation of periodic modulation in tritium beta decay sets a new 95% CL exclusion on ultralight Nelson-Barr scalar dark matter: f below 7.0e9 to 1.4e7 GeV is ruled out for m_phi in 3.4e-23 to 1.7e-20 eV.
Pomm ´e, Metrologia 52, S51 (2015)
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Constraint on ultralight Nelson-Barr dark matter from time-dependent nuclear decay
Non-observation of periodic modulation in tritium beta decay sets a new 95% CL exclusion on ultralight Nelson-Barr scalar dark matter: f below 7.0e9 to 1.4e7 GeV is ruled out for m_phi in 3.4e-23 to 1.7e-20 eV.