{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:INOD5MD47RYF5W6A4XCDCXAALJ","short_pith_number":"pith:INOD5MD4","canonical_record":{"source":{"id":"1802.07012","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-02-20T08:46:51Z","cross_cats_sorted":[],"title_canon_sha256":"08c58140ed4ebd567e17729facae05d34f2cef709e33cf1f705d32c2f3098c30","abstract_canon_sha256":"4120d95a9a6973cab0f0dd7193c0b18dccabe7c22bae2a9829ad32b9910bd851"},"schema_version":"1.0"},"canonical_sha256":"435c3eb07cfc705edbc0e5c4315c005a6ea82a0cca8de2b7af331c5f109ca0a2","source":{"kind":"arxiv","id":"1802.07012","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.07012","created_at":"2026-05-18T00:11:06Z"},{"alias_kind":"arxiv_version","alias_value":"1802.07012v1","created_at":"2026-05-18T00:11:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.07012","created_at":"2026-05-18T00:11:06Z"},{"alias_kind":"pith_short_12","alias_value":"INOD5MD47RYF","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_16","alias_value":"INOD5MD47RYF5W6A","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_8","alias_value":"INOD5MD4","created_at":"2026-05-18T12:32:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:INOD5MD47RYF5W6A4XCDCXAALJ","target":"record","payload":{"canonical_record":{"source":{"id":"1802.07012","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-02-20T08:46:51Z","cross_cats_sorted":[],"title_canon_sha256":"08c58140ed4ebd567e17729facae05d34f2cef709e33cf1f705d32c2f3098c30","abstract_canon_sha256":"4120d95a9a6973cab0f0dd7193c0b18dccabe7c22bae2a9829ad32b9910bd851"},"schema_version":"1.0"},"canonical_sha256":"435c3eb07cfc705edbc0e5c4315c005a6ea82a0cca8de2b7af331c5f109ca0a2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:11:06.127171Z","signature_b64":"XEaGaYUbjbzpbBK+P9m1pVPS1HEYIM8vgGo3QiYen/NX8iqVaDhGS6zbEVoTm+Le0f+j+Z2cTasnOltGAxZPBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"435c3eb07cfc705edbc0e5c4315c005a6ea82a0cca8de2b7af331c5f109ca0a2","last_reissued_at":"2026-05-18T00:11:06.126485Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:11:06.126485Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1802.07012","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:11:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FKRtc7ta1rdb/ZkFNWJbaKl1KT4DxScaP4C9wOLM4DO21iduLf5Z+io32zWGoDgqg/EOyfgZa//bfe+sJrp6Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T07:50:21.297997Z"},"content_sha256":"c0e50df8d2506409f7774bfbc3f9fcc33d7849e26a639ee9da0a63ed7541d570","schema_version":"1.0","event_id":"sha256:c0e50df8d2506409f7774bfbc3f9fcc33d7849e26a639ee9da0a63ed7541d570"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:INOD5MD47RYF5W6A4XCDCXAALJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Producing long-lived $2^3\\text{S}$ Ps via $3^3\\text{P}$ laser excitation in magnetic and electric fields","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"A. Belov, A. Camper, A. Demetrio, A. Fontana, A. Gligorova, A. Hinterberger, A. Kellerbauer, A. Rotondi, B. Rienaecker, C. Amsler, C. Evans, C. Malbrunot, C. Zimmer, D. Comparat, D. Krasnicky, D. Pagano, E. Widmann, F. Castelli, F. Guatieri, F. Prelz, F. Sorrentino, G. Bonomi, G. Cerchiari, G. Consolati, G. Nebbia, G. Testera, H. Holmestad, H. Sandacker, I. C. Tietje, J. Fesel, J. Marton, J. Robert, J. Zmeskal, L. Di Noto, L. Penasa, L. Smestad, M. Antonello, M. Caccia, M. Doser, M. Fani, M. Giammarchi, M. Oberthaler, M. Prevedelli, M. Vujanovic, N. Zurlo (the AEgIS collaboration), O. Khalidova, O. M. Rohne, P. Hackstock, P. Lansonneur, P. Lebrun, P. Nedelec, P. Yzombard, R. Caravita, R. Ferragut, R. Santoro, R. S. Brusa, S. Aghion, S. Gerber, S. Haider, S. Mariazzi, S. R. Muller, V. Lagormarsino, V. Matveev, V. Petracek, Z. Mazzotta","submitted_at":"2018-02-20T08:46:51Z","abstract_excerpt":"Producing positronium (Ps) in the metastable $2^3\\text{S}$ state is of interest for various applications in fundamental physics. We report here about an experiment in which Ps atoms are produced in this long-lived state by spontaneous radiative decay of Ps excited to the $3^3\\text{P}$ level manifold. The Ps cloud excitation is obtained with a UV laser pulse in an experimental vacuum chamber in presence of guiding magnetic field of 25 mT and an average electric field of 300 V/cm. The indication of the $2^3\\text{S}$ state production is obtained from a novel analysis technique of single-shot posi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.07012","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:11:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lM74in3oLSEadHFKEyWXXXIc08+C7CQP/Z6GP8scIi3hWMnL/wog14m9UFJdlmCepzb0sDNL5WGQyAqmu2IXBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T07:50:21.298375Z"},"content_sha256":"2c0c65745945ef2ad481d57611a9fb196a335819dfb17310f86cea4c34e12f13","schema_version":"1.0","event_id":"sha256:2c0c65745945ef2ad481d57611a9fb196a335819dfb17310f86cea4c34e12f13"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/INOD5MD47RYF5W6A4XCDCXAALJ/bundle.json","state_url":"https://pith.science/pith/INOD5MD47RYF5W6A4XCDCXAALJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/INOD5MD47RYF5W6A4XCDCXAALJ/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-01T07:50:21Z","links":{"resolver":"https://pith.science/pith/INOD5MD47RYF5W6A4XCDCXAALJ","bundle":"https://pith.science/pith/INOD5MD47RYF5W6A4XCDCXAALJ/bundle.json","state":"https://pith.science/pith/INOD5MD47RYF5W6A4XCDCXAALJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/INOD5MD47RYF5W6A4XCDCXAALJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:INOD5MD47RYF5W6A4XCDCXAALJ","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"4120d95a9a6973cab0f0dd7193c0b18dccabe7c22bae2a9829ad32b9910bd851","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-02-20T08:46:51Z","title_canon_sha256":"08c58140ed4ebd567e17729facae05d34f2cef709e33cf1f705d32c2f3098c30"},"schema_version":"1.0","source":{"id":"1802.07012","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.07012","created_at":"2026-05-18T00:11:06Z"},{"alias_kind":"arxiv_version","alias_value":"1802.07012v1","created_at":"2026-05-18T00:11:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.07012","created_at":"2026-05-18T00:11:06Z"},{"alias_kind":"pith_short_12","alias_value":"INOD5MD47RYF","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_16","alias_value":"INOD5MD47RYF5W6A","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_8","alias_value":"INOD5MD4","created_at":"2026-05-18T12:32:31Z"}],"graph_snapshots":[{"event_id":"sha256:2c0c65745945ef2ad481d57611a9fb196a335819dfb17310f86cea4c34e12f13","target":"graph","created_at":"2026-05-18T00:11:06Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Producing positronium (Ps) in the metastable $2^3\\text{S}$ state is of interest for various applications in fundamental physics. We report here about an experiment in which Ps atoms are produced in this long-lived state by spontaneous radiative decay of Ps excited to the $3^3\\text{P}$ level manifold. The Ps cloud excitation is obtained with a UV laser pulse in an experimental vacuum chamber in presence of guiding magnetic field of 25 mT and an average electric field of 300 V/cm. The indication of the $2^3\\text{S}$ state production is obtained from a novel analysis technique of single-shot posi","authors_text":"A. Belov, A. Camper, A. Demetrio, A. Fontana, A. Gligorova, A. Hinterberger, A. Kellerbauer, A. Rotondi, B. Rienaecker, C. Amsler, C. Evans, C. Malbrunot, C. Zimmer, D. Comparat, D. Krasnicky, D. Pagano, E. Widmann, F. Castelli, F. Guatieri, F. Prelz, F. Sorrentino, G. Bonomi, G. Cerchiari, G. Consolati, G. Nebbia, G. Testera, H. Holmestad, H. Sandacker, I. C. Tietje, J. Fesel, J. Marton, J. Robert, J. Zmeskal, L. Di Noto, L. Penasa, L. Smestad, M. Antonello, M. Caccia, M. Doser, M. Fani, M. Giammarchi, M. Oberthaler, M. Prevedelli, M. Vujanovic, N. Zurlo (the AEgIS collaboration), O. Khalidova, O. M. Rohne, P. Hackstock, P. Lansonneur, P. Lebrun, P. Nedelec, P. Yzombard, R. Caravita, R. Ferragut, R. Santoro, R. S. Brusa, S. Aghion, S. Gerber, S. Haider, S. Mariazzi, S. R. Muller, V. Lagormarsino, V. Matveev, V. Petracek, Z. Mazzotta","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-02-20T08:46:51Z","title":"Producing long-lived $2^3\\text{S}$ Ps via $3^3\\text{P}$ laser excitation in magnetic and electric fields"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.07012","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:c0e50df8d2506409f7774bfbc3f9fcc33d7849e26a639ee9da0a63ed7541d570","target":"record","created_at":"2026-05-18T00:11:06Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"4120d95a9a6973cab0f0dd7193c0b18dccabe7c22bae2a9829ad32b9910bd851","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-02-20T08:46:51Z","title_canon_sha256":"08c58140ed4ebd567e17729facae05d34f2cef709e33cf1f705d32c2f3098c30"},"schema_version":"1.0","source":{"id":"1802.07012","kind":"arxiv","version":1}},"canonical_sha256":"435c3eb07cfc705edbc0e5c4315c005a6ea82a0cca8de2b7af331c5f109ca0a2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"435c3eb07cfc705edbc0e5c4315c005a6ea82a0cca8de2b7af331c5f109ca0a2","first_computed_at":"2026-05-18T00:11:06.126485Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:11:06.126485Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XEaGaYUbjbzpbBK+P9m1pVPS1HEYIM8vgGo3QiYen/NX8iqVaDhGS6zbEVoTm+Le0f+j+Z2cTasnOltGAxZPBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:11:06.127171Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.07012","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c0e50df8d2506409f7774bfbc3f9fcc33d7849e26a639ee9da0a63ed7541d570","sha256:2c0c65745945ef2ad481d57611a9fb196a335819dfb17310f86cea4c34e12f13"],"state_sha256":"fa7836498a696799035580004e96fb1a79352436dfdf42d2fa36e8073d86eaa2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DZfHOCO0i/UNKtTeCvoKN1bDIyKfbp+ZSTuVbaXg2FGun7fU9madYmYxbZ7eiho0sjubWK7BMv17PcKy7GfAAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T07:50:21.300395Z","bundle_sha256":"398fe1aab9a227fdfc318b80e502da7f95af19699a64f84b839a103f174c7cb6"}}