Speaker
Description
The neutron lifetime is a fundamental parameter in particle physics and cosmology, with important implications for tests of Standard Model consistency and predictions of light-element abundances in the early universe. More precise neutron lifetime measurements are needed both to test these predictions and to help resolve the long-standing neutron lifetime puzzle. This puzzle refers to a 3.8 σ discrepancy between neutron lifetime results from beam experiments and ultracold neutron trap experiments. While the origin of this discrepancy remains unclear, it has motivated efforts to improve experimental precision and to explore possible explanations ranging from unaccounted systematic effects to physics beyond the Standard Model, including exotic neutron decay channels.
PENeLOPE (Precision Experiment on the Neutron Lifetime Operating with Proton Extraction) is a magneto-gravitational ultracold neutron trap experiment designed to measure the neutron lifetime with a target precision of 0.1 s or better. Originally developed at the Technical University of Munich, PENeLOPE was relocated to TRIUMF in late 2023 and has since entered its first commissioning campaign at the facility. This phase focuses on reassembly of the apparatus and commissioning of the cryogenic and superconducting magnet systems. An initial cryostat cooldown attempt in early 2025 motivated a series of targeted improvements to the cryogenic infrastructure. Current efforts are directed toward implementing these upgrades and preparing for subsequent cooldowns aimed at achieving stable magnet operation and initiating magnet quench training. These commissioning activities represent key steps toward full operation of PENeLOPE.
| Keyword-1 | ultracold |
|---|---|
| Keyword-2 | neutron |
| Keyword-3 | lifetime |