Search for Tri-Nucleon Decay in the Majorana Demonstrator

Abstract

The Majorana Demonstrator is an ultra low-background experiment searching for neutrinoless double-beta decay in ${}^{76}$Ge. The heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility in Lead, South Dakota, also allows searches for new exotic physics. We present the first limits for tri-nucleon decay-specific modes and invisible decay modes for Ge isotopes. We find a half-life limit of $4.9\times 10^{25}$ yr for the decay ${}^{76}\mathrm{Ge}(\mathrm{ppn})\to {}^{73}\mathrm{Zn}{e}^{+}{\pi }^{+}$ and $4.7\times 10^{25}$ yr for the decay ${}^{76}\mathrm{Ge}(\mathrm{ppp}){\to }^{73}\mathrm{Cu}{e}^{+}{\pi }^{+}{\pi }^{+}$. The half-life limit for the invisible tri-proton decay mode of ${}^{76}$Ge was found to be $7.5\times 10^{24}$ yr.

arXiv commentUpdated after suggested figure additions from referees

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Cited by in corpus (14)

• Toward the discovery of matter creation with neutrinoless double-beta decay
• A Search for Neutrinoless Double-Beta Decay in ${}^{76}$Ge with 26 kg-yr of Exposure from the MAJORANA DEMONSTRATOR
• Final Result of the MAJORANA DEMONSTRATOR's Search for Neutrinoless Double-$\beta$ Decay in ${}^{76}$Ge
• Inclusive Nucleon Decay Searches as a Frontier of Baryon Number Violation
• Direct Detection Limits on Heavy Dark Matter
• Neutron Stars with Baryon Number Violation, Probing Dark Sectors
• Baryon-Number-Violating Nucleon and Dinucleon Decays in a Model with Large Extra Dimensions
• Double Beta Decay APPEC Committee Report
• Cosmogenic activation in double beta decay experiments
• Search for charge nonconservation and Pauli exclusion principle violation with the Majorana Demonstrator
• Double Beta Decay Experiments at Canfranc Underground Laboratory
• Experimental study of 13C(α,n)16O reactions in the Majorana Demonstrator calibration data
• Performance of a convolutional autoencoder designed to remove electronic noise from p-type point contact germanium detector signals
• Rare multi-nucleon decays with the full data sets of the Majorana Demonstrator