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Absolute rates are measured in a systematic way for several laser detunings ranging from -5 to -30 MHz and at different intensities, by monitoring the decay of the trap fluorescence. The dependence of the two-body loss rate coefficient $\\beta$ on the excited state ($2^3P_2$) and metastable state ($2^3S_1$) populations is also investigated.\n  From these results we infer a rather uniform rate constant $K_{sp}=(1{\\pm}0.4)\\times10^{-7}$ cm$^3$/s."},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"physics/0103063","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"physics.atom-ph","submitted_at":"2001-03-20T18:40:52Z","cross_cats_sorted":[],"title_canon_sha256":"e62945365b000987adbfa97c11ec5d37134133f1ea32da27121f948b237e040e","abstract_canon_sha256":"85d12921382fc44db0bacd077c6ee5e0aa17f10bb9c1865a0cbf97360dc9ff23"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:28:45.733398Z","signature_b64":"3tWgmyXYGgQAEtTnTJmfcGI/53VewA/9NSmbGyvB66HAK7NljEYhfdrV+Lg2BKe6ukqz7r5uEIcdlStFHkQsDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"01b7214492bd18bafccf992556f4f63eabc91b3736cb7027db59619c6ca35b95","last_reissued_at":"2026-07-04T16:28:45.733038Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:28:45.733038Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Penning collisions of laser-cooled metastable helium atoms","license":"","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"A. 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