International Muon Week 2023

International Muon Week(s) - Muon Flux Study

February 13-24, 2023

Is the cosmic ray flux the same all over the world? Let's find out!


To register, please fill out the short form below. From the registration information, we will create an international map showing the locations of participating sites.

Register Here:

Map of 2021 Participants.


Leading up to February 13, verify that your detector is operational by testing that your hardware is running and collecting data.

Collect as much flux data as you can during the period February 13-24. It is not necessary to collect data all the time. Some data are preferable to no data.

For our experiment procedure, we need similar experimental conditions. We ask all users to place their detector counters in a stacked configuration directly on top of each other with no distance between the counters. Please remember to update your CRMD geometry. If  you have four counters, please set up the analysis to four-fold coincidence. if you use three counters, please up for three-fold coincidence. 





Make a flux plot for your entire data set you collected using an analysis tool of your choice. The Cosmic Ray e-Lab will simplify building a flux plot, then you can capture the plot URL to share with others. We suggest you prepare a one-page PDF report of your results. Include the names of the sites, plot pictures, and any discussion or conclusions from your collaboration. Please email the final report to

For Cosmic Ray e-Lab users: At the end of the week, upload your data to the Cosmic Ray e-Lab (, run a flux analysis on the week's data and save the plot. go to "View Plots" and open your saved flux plot, then capture the URL. Submit it through the submit flux plot link above.

If you need a Cosmic Ray e-Lab account, follow the instructions on this page (



We encourage you to have students ask questions of other students regarding the data. We can schedule a video meeting with a moderator at Fermilab during the week following International Muon Week. If you can participate only for part of the week, even a day, we encourage you to do so, and to submit your results. 




Mark Adams (

Nicole Preiser (

Jeff Rodriguez (