On a Liquid Krypton TPC for double positron decay searches
arXiv:2607.28360
The paper proposes a liquid‑krypton time projection chamber that tags the four 511 keV gammas from double‑positron decay, enabling a near background‑free search with sensitivity up to 10^30 years.
Abstract
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 y with a ton scale detector.