Publication Type
Journal
Journal Name
Physical Review Letters
Publication Date
Page Number
161801
Volume
118
Issue
16
Abstract
We present new limits on exotic keV-scale physics based on 478 kg d of Majorana Demonstrator commissioning data. Constraints at the 90% confidence level are derived on bosonic dark matter (DM) and solar axion couplings, Pauli exclusion principle violating (PEPV) decay, and electron decay using monoenergetic peak signal limits above our background. Our most stringent DM constraints are set for 11.8 keV mass particles, limiting gAe<4.5×10−13 for pseudoscalars and (α′/α)<9.7×10−28 for vectors. We also report a 14.4 keV solar axion coupling limit of geffAN×gAe<3.8×10−17, a 12β2<8.5×10−48 limit on the strength of PEPV electron transitions, and a lower limit on the electron lifetime of τe>1.2×1024 yr for e−→ invisible.
