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While the international nEDM collaboration at the Paul Scherrer Institut (PSI) took data in 2017 that covered a considerable fraction of the parameter space of claimed potential signals of hypothetical neutron (n) to mirror-neutron ( n ′ ) transitions, it could not test all claimed signal regions at various mirror magnetic fields. Therefore, a new study of n − n ′ oscillations using stored ultracold neutrons (UCNs) is underway at PSI, considerably expanding the reach in parameter space of mirror magnetic fields ( B ′ ) and oscillation time constants ( τ n n ′ ). The new apparatus is designed to test for the anomalous loss of stored ultracold neutrons as a function of an applied magnetic field. The experiment is distinguished from its predecessors by its very large storage vessel (1.47 m3), enhancing its statistical sensitivity. In a test experiment in 2020 we have demonstrated the capabilities of our apparatus. However, the full analysis of our recent data is still pending. Based on already demonstrated performance, we will reach sensitivity to oscillation times τ n n ′ / cos (β) well above a hundred seconds, with β being the angle between B ′ and the applied magnetic field B. The scan of B will allow the finding or the comprehensive exclusion of potential signals reported in the analysis of previous experiments and suggested to be consistent with neutron to mirror-neutron oscillations. [ABSTRACT FROM AUTHOR]

The acronym "PSI", containing symmetries and interactions, describes the physics framework that brings together a worldwide fundamental physics community at the Paul Scherrer Institut (PSI) every three years. Due to the common interest in many physics topics covered by PSI2022, three sessions on Tuesday were held as a joint event together with FIPs'22, the Workshop on Feebly-Interacting ParticleS taking place at CERN at the same time. PSI is a world-leading institution providing high-intensity muon and pion beams, and ultracold neutrons for fundamental physics research. [Extracted from the article]

Während das Elektron zur ersten Familie der Fermionen gehört, ist das Myon sein schwerer Vetter aus der zweiten Familie. Es zerfällt allerdings nach rund zwei Mikrosekunden. Am Paul Scherrer Institut gelang eine neue hochpräzise Messung dieser Lebensdauer. Sie erlaubt es, die Kopplungskonstante, das heißt die Stärke, der schwachen Kraft präziser zu bestimmen. Diese Naturkonstante ist fundamental wichtig für das Verständnis von radioaktiven Zerfällen, Kernfusion und besonders für das Standardmodell der Teilchenphysik. Myonen haben den Vorteil, dass sie sich an einem Beschleuniger in großer Menge erzeugen lassen. Sie eignen sich einerseits für Präzisionsmessungen, um Parameter des Standardmodells genauer festzulegen. Andererseits spielen sie auch auf der Suche nach 'neuer Physik' eine wichtige Rolle. [ABSTRACT FROM AUTHOR]

We demonstrate the use of a hybrid 3He/87 magnetometer to measure absolute magnetic fields in the pT range. The measurements were undertaken by probing time-dependent 3He magnetisation using 87Rb zero-field magnetometers. Measurements were taken to demonstrate the use of the magnetometer in cancelling residual fields within a magnetic shield. It was shown that the absolute field could be reduced to the 10 pT level by using field readings from the magnetometer. Furthermore, the hybrid magnetometer was shown to be applicable for the reduction of gradient fields by optimising the effective 3He T2 time. This procedure represents a convenient and consistent way to provide a near zero magnetic field environment which can be potentially used as a base for generating desired magnetic field configurations for use in precision measurements. [ABSTRACT FROM AUTHOR]