Antiproton Trapping for 614 days

Antiproton Trapping for 614 days | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Antiproton Trapping for 614 days Stefan Ulmer, Julia Jaeger, Barbara Latacz, Bela Arndt, Stefan Erlewein, and 21 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8497454/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted You are reading this latest preprint version Abstract We report the trapping and continuous monitoring of a cloud of antiprotons (\pbar{}) for 614 days in the BASE reservoir trap at CERN, representing the longest confinement of antimatter achieved to date. The experiment is operated at an exceptionally low particle-loss rate of less than one antiproton per month, with intervals approaching up to five months without a single loss, and demonstrating one year of continuous experiment operation within which only three particles were consumed. This unprecedented stability establishes a new paradigm for high-precision studies of exotic and ultra-rare charged particles. Our approach is readily extendable to other species, including highly charged ions and prospective antimatter systems such as $\overline{\mathrm{H}}_2^-$, $\overline{\mathrm{H}}^+$, and $\overline{\mathrm{d}}$. By analyzing all BASE reservoir trap data collected since 2014, we set a five-fold improved lower bound on the directly constrained antiproton lifetime. Beyond its fundamental implications, this advance enables future transport and precision measurements on \pbar{} and other exotic ions in dedicated offline laboratories, opening new frontiers in antimatter research. Physical sciences/Physics/Atomic and molecular physics/Exotic atoms and molecules Physical sciences/Physics/Particle physics/Experimental particle physics Full Text Additional Declarations There is NO Competing Interest. Cite Share Download PDF Status: Under Review Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-8497454","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":578265600,"identity":"637a130f-0cae-4c59-b039-d4219e197511","order_by":0,"name":"Stefan 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