Phys.Rev. C 103, 015501 (2021)

I.J.Arnquist, for the Majorana Collaboration

Search for double-β decay of ⁷⁶Ge to excited states of ⁷⁶Se with the MAJORANA DEMONSTRATOR

RADIOACTIVITY ⁷⁶Ge(2β^-); measured Eγ, Iγ, γγ-coin using MAJORANA DEMONSTRATOR array of HPGe detectors with 41.9 kg yr of isotopic exposure at Sanford Underground Research Facility (SURF); deduced lower limits of half-lives for 0νββ and 2νββ decay modes to the ground state, and first two 2+ excited states, and the first excited 0+ state of ⁷⁶Se, and upper limit of effective Majorana mass of the electron neutrino. Comparison with earlier experimental results.

doi: 10.1103/PhysRevC.103.015501