PreprintCC BY 4.0arXiv
On a Liquid Krypton TPC for double positron decay searches
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 backgroun. 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.
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BibTeX
@misc{torelli2026liquid,
title = {{On a Liquid Krypton TPC for double positron decay searches}},
author = {S. Torelli and A. Simón Estévez and F. Monrabal Capilla},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2607.28360},
eprint = {2607.28360},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.28360},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - On a Liquid Krypton TPC for double positron decay searches
AU - S. Torelli
AU - A. Simón Estévez
AU - F. Monrabal Capilla
PY - 2026
DA - 2026/09/17
PB - arXiv
DO - 10.48550/arxiv.2607.28360
UR - https://arxiv.org/abs/2607.28360
AB - 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 backgroun. 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 10^29−10^30 y with a ton scale detector.
ER -