High Impact: Final Results of the MAJORANA DEMONSTRATOR's Search for Double-Beta Decay of 76Ge to Excited States of 76Se

⁷⁶Ge can 𝛽⁢𝛽 decay into three possible excited states of ⁷⁶Se, with the emission of two or, if the neutrino is Majorana, zero neutrinos. None of these six transitions have yet been observed. The Majorana Demonstrator was designed to study 𝛽⁢𝛽 decay of ⁷⁶Ge using a low background array of high purity germanium detectors. With 98.2 kg-y of isotopic exposure, the demonstrator sets the strongest half-life limits to date for all six transition modes. For 2⁢𝜈⁢𝛽⁢𝛽 to the 0₁⁺ state of ⁷⁶Se, this search has begun to probe for the first time half-life values predicted using modern many-body nuclear theory techniques, setting a limit of 𝑇_1/2>1.5×10²⁴  y (90% CL).