2026/07/30 by S. Torelli, A. Simón Estévez, F. Monrabal Capilla
Physics and Astronomy · #physics.ins-det #nucl-ex
arxiv created 2026/07/30 · arxiv updated 2026/07/31
Double positron decay features the emission of four 511 keV gamma rays from positron alongside the well-known 'double blob' signature which can be tracked with a TPC. Successfully detecting these gammas creates a unique signature that cannot be replicated by any background radiation. This enables a virtually background-free search if the four gammas are efficiently tagged. In this work, we propose the concept of a liquid Krypton Time Projection Chamber designed to search for double positron decay using this four-gamma tagging concept, and we'll show how already a small version of this prototype could set the world best limit on the search of this decay towards a sensitivity of 1029-1030 y with a ton scale detector.