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DTSTAMP:20261102T091118
DTSTART;TZID=America/Detroit:20261109T150000
DTEND;TZID=America/Detroit:20261109T160000
SUMMARY:Workshop / Seminar:HEP-Astro Seminar | The galaxy's history under our feet: paleo-detection of cosmic rays with PRimuS
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.
UID:154409-21917688@events.umich.edu
URL:https://events.umich.edu/event/154409
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Physics,Science
LOCATION:West Hall - 340
CONTACT:
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