{ "154409-21917688": { "datetime_modified":"20261102T091118", "datetime_start":"20261109T150000", "datetime_end":"20261109T160000", "has_end_time":1, "date_start":"2026-11-09", "date_end":"2026-11-09", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"HEP-Astro Seminar | The galaxy's history under our feet: paleo-detection of cosmic rays with PRimuS", "occurrence_title":"", "combined_title":"HEP-Astro Seminar | The galaxy's history under our feet: paleo-detection of cosmic rays with PRimuS: Claudio Galelli (INFN Milano)", "event_subtitle":"Claudio Galelli (INFN Milano)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"The sources and history of cosmic rays are largely unknown because of the intrinsic deflection and delay imposed by cosmic magnetic fields. Minerals might offer a way to investigate this mystery from the rock record, as they preserve the damage tracks of the particles that crossed them over their geological history. This idea, known as paleo-detection, is mostly known for rare-event searches, such as WIMP recoils and neutrino interactions, where nanometre-scale tracks and the need for ultraclean minerals require a demanding readout. Cosmic rays are the opposite case: the signal is expected to be abundant, and the micron-to-tens-of-micron tracks can be revealed with simple etching and optical microscopy. \n\nI will present the simulation framework we built to predict the track-length spectrum for a given mineral and flux history. It combines MCEq and Geant4, follows the overburden history of the sample, and folds in detection efficiency and measurement effects. I will then show how these predictions are confronted with data in PRImuS, our experimental proof of concept: chemical etching of obsidian, argon-plasma etching of halite, automated optical microscopy, and OptimusPrimus, a deep-learning tool for track recognition. The pipeline is validated on obsidian, and its application to halite is the next step. I will conclude with the outlook toward the possible GALACTIC project, based on light-sheet microscopy.", "occurrence_notes":null, "guid":"154409-21917688@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/154409", "building_id":"1000167", "building_name":"West Hall", "campus_maps_id":"163", "room":"340", "location_name":"West Hall", "has_livestream":0, "cost":"", "tags":["Physics","Science"], "website":"", "sponsors":[ { "group_name":"HEP - Astro Seminars", "group_id":"3799", "website":"" }, { "group_name":"Department of Physics", "group_id":"1965", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21917688 } , "154463-21917780": { "datetime_modified":"20261102T204011", "datetime_start":"20261109T150000", "datetime_end":"20261109T160000", "has_end_time":1, "date_start":"2026-11-09", "date_end":"2026-11-09", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Math Grad Show and Tell Seminar: The surprising asymptotics of bingo", "occurrence_title":"", "combined_title":"Math Grad Show and Tell Seminar: The surprising asymptotics of bingo: Surya Subbarao", "event_subtitle":"Surya Subbarao", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Inspired by Okta Verify Bingo in the graduate lounge, consider an N by N square of cells. Every second, a uniformly random cell is chosen (with replacement) and filled in. What is the expected amount of time until a bingo, i.e. a fully filled in row, column, or diagonal? How does this grow asymptotically as N increases? The answer involves some interesting mathematics and may surprise you.", "occurrence_notes":null, "guid":"154463-21917780@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/154463", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"https:\/\/public.websites.umich.edu\/~mmadrugo\/MGSTS\/", "sponsors":[ { "group_name":"Math Grad Show and Tell Seminar - Department of Mathematics", "group_id":"5515", "website":"" }, { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/11\/event_154463_original-1.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/11\/event_154463_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/11\/event_154463_original-1.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/11\/event_154463_original-1.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/11\/event_154463_original-1.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/11\/event_154463_original-1.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/11\/event_154463_original-1.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/11\/event_154463_original-1.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/11\/event_154463_original-1.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/11\/event_154463_original-1.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/11\/event_154463_original-1.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/11\/event_154463_original-1.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/11\/event_154463_original-1.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/11\/event_154463_original-1.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/11\/event_154463_original-1.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/11\/event_154463_original-1.png" }, "occurrence_count":1, "first_occurrence":21917780 } }