Making sense of the muon’s misdemeanours

An exotic atom called muonium could explain why muons won’t stick to the rules, believe researchers using the Swiss Muon Source at Paul Scherrer Institute PSI.

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Upgraded pixel detector back in action at CERN

Built at Paul Scherrer Institute, the detector forms the heart of the CMS experiment. It is producing data again following an upgrade during the LHC shutdown.

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Waiting for the repository

How computer simulations are helping ensuring a safe and efficient transfer of used nuclear fuel from temporary dry storage to its final resting place deep underground.

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How mixing of atmospheric aerosols affects the environment

Peering inside atmospheric particles provides clues to effects on climate and health, finds Paul Scherrer Institute and University of British Columbia study.

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On-track for SLS2.0: First magnet series measured

Successful measurement of the first 112 magnets puts the PSI magnet section on-schedule to measure all of the 1000+ magnets needed for SLS2.0 by July 2024.

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LEAPS research infrastructures to tackle societal crises

Against a backdrop of the energy crisis, scientists and policy makers convene at Paul Scherrer Institute PSI and set out a vision for European light sources

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Welcome to the PSI Science Portal. On this site you find information on PSI's different research activities and on the experimental opportunities at PSI's large scale research infrastructures.

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Support for Ukraine

The war in Ukraine is causing great hardship for many people. The Paul Scherrer Institute has taken a number of measures to offer a hand to those affected.

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PSI User Office

The PSI User Office is a central PSI installation to serve the users from all the four user laboratories.

Conference Calendar

Conferences related to methods and topics addressed at our user facilities

PSI Publications

Digital repository and bibliography for all research articles and other publications affiliated with the PSI

PSI User Facilities Newsletter

Current News from PSI photon, neutron and muon user facilities

Lib4RI

Library for the Research Institutes within the ETH Domain: Eawag, Empa, PSI & WSL.

Research Integrity at PSI

Research Integrity at the research institutes PSI, EMPA, Eawag, WSL

PSI Guest House

The PSI operates a Guest House to offer a local and practical accommodation for its visitors, guests and users on site.