{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:SUMXFIP6PDOV2TLNZUZCBDIPQY","short_pith_number":"pith:SUMXFIP6","canonical_record":{"source":{"id":"1707.03583","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2017-07-12T07:54:14Z","cross_cats_sorted":[],"title_canon_sha256":"46242ff95eecd2fc2223a9c0bc4afa4d3c9954431c14f5b2f635e081a6f9c3ae","abstract_canon_sha256":"97ee8cd02f9a0db887b79c02db45976e01c6e55396eee316feb4f4be9e154620"},"schema_version":"1.0"},"canonical_sha256":"951972a1fe78dd5d4d6dcd32208d0f862d31b6ecf337f47623763a8d7ac84ec5","source":{"kind":"arxiv","id":"1707.03583","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1707.03583","created_at":"2026-05-18T00:40:02Z"},{"alias_kind":"arxiv_version","alias_value":"1707.03583v1","created_at":"2026-05-18T00:40:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.03583","created_at":"2026-05-18T00:40:02Z"},{"alias_kind":"pith_short_12","alias_value":"SUMXFIP6PDOV","created_at":"2026-05-18T12:31:43Z"},{"alias_kind":"pith_short_16","alias_value":"SUMXFIP6PDOV2TLN","created_at":"2026-05-18T12:31:43Z"},{"alias_kind":"pith_short_8","alias_value":"SUMXFIP6","created_at":"2026-05-18T12:31:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:SUMXFIP6PDOV2TLNZUZCBDIPQY","target":"record","payload":{"canonical_record":{"source":{"id":"1707.03583","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2017-07-12T07:54:14Z","cross_cats_sorted":[],"title_canon_sha256":"46242ff95eecd2fc2223a9c0bc4afa4d3c9954431c14f5b2f635e081a6f9c3ae","abstract_canon_sha256":"97ee8cd02f9a0db887b79c02db45976e01c6e55396eee316feb4f4be9e154620"},"schema_version":"1.0"},"canonical_sha256":"951972a1fe78dd5d4d6dcd32208d0f862d31b6ecf337f47623763a8d7ac84ec5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:40:02.765152Z","signature_b64":"uPZ5Uss1gKehWLfxLhUpHwcQhjRQQt3hJdVp9hqNHHeFhhl6tA+n1UjKRuvKXJjZBRMcczlNVNBS3g++pVZrBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"951972a1fe78dd5d4d6dcd32208d0f862d31b6ecf337f47623763a8d7ac84ec5","last_reissued_at":"2026-05-18T00:40:02.764671Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:40:02.764671Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1707.03583","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":"2026-05-18T00:40:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Yr9I2mcGh6M2E/QOR2qvgFH0ZEdXKOa5ryOiXvgYPxxzWzsEVSmEPn9vz2NMFwXOJcRsBGi/HD/sbiNxLwGfDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T00:44:02.350551Z"},"content_sha256":"5fac766858296b0263d5c84b9fe3f7fc7f718a088894a4459996d65567e10062","schema_version":"1.0","event_id":"sha256:5fac766858296b0263d5c84b9fe3f7fc7f718a088894a4459996d65567e10062"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:SUMXFIP6PDOV2TLNZUZCBDIPQY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A proton density bubble in the doubly magic $^{34}$Si nucleus","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"2), 3), A. Gade (3), A. Lemasson (2, A. Lepailleur (2), A. Mutschler (1, C. Borcea (4), D. Bazin (3), D. Sohler (5), D. Weisshaar (3), E. Khan (1), F. Recchia (3), F. Rotaru (4), H. Iwasaki (3), J. A. Tostevin, J.P. Ebran, K. Wimmer (3) ((1) IPNO (2) GANIL (3) NSCL (4) IFIN HH (5) ATOMKI), M. Stanoiu (4), M. Vandebrouck (1), O. Sorlin (2), R. Borcea (4), S.R. Stroberg (3), T. Roger (2), Z. Dombradi (5)","submitted_at":"2017-07-12T07:54:14Z","abstract_excerpt":"Many properties of the atomic nucleus, such as vibrations, rotations and incompressibility, can be interpreted as due to a two component quantum liquid of protons and neutrons. Electron scattering measurements on stable nuclei demonstrate that their central densities are saturated, as for liquid drops. In exotic nuclei near the limits of mass and charge, with large imbalances in their proton and neutron numbers, the possibility of a depleted central density, or a 'bubble' structure, has been discussed in a recurrent manner since the 1970s. Here we report first experimental evidence that points"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.03583","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":"2026-05-18T00:40:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m2a17BvkRGMX7MePZY5mb2KXRRNBIynup/65DB+kE0fb3PypqIlOrRbS0WbdpacXTgpM7JSmvaqjzM1b3+xmCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T00:44:02.351281Z"},"content_sha256":"268acaa051962213f2e58bb7099a57036cdcee854f3c86b2636e878e71b2f238","schema_version":"1.0","event_id":"sha256:268acaa051962213f2e58bb7099a57036cdcee854f3c86b2636e878e71b2f238"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SUMXFIP6PDOV2TLNZUZCBDIPQY/bundle.json","state_url":"https://pith.science/pith/SUMXFIP6PDOV2TLNZUZCBDIPQY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SUMXFIP6PDOV2TLNZUZCBDIPQY/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":"2026-05-31T00:44:02Z","links":{"resolver":"https://pith.science/pith/SUMXFIP6PDOV2TLNZUZCBDIPQY","bundle":"https://pith.science/pith/SUMXFIP6PDOV2TLNZUZCBDIPQY/bundle.json","state":"https://pith.science/pith/SUMXFIP6PDOV2TLNZUZCBDIPQY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SUMXFIP6PDOV2TLNZUZCBDIPQY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:SUMXFIP6PDOV2TLNZUZCBDIPQY","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":"97ee8cd02f9a0db887b79c02db45976e01c6e55396eee316feb4f4be9e154620","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2017-07-12T07:54:14Z","title_canon_sha256":"46242ff95eecd2fc2223a9c0bc4afa4d3c9954431c14f5b2f635e081a6f9c3ae"},"schema_version":"1.0","source":{"id":"1707.03583","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1707.03583","created_at":"2026-05-18T00:40:02Z"},{"alias_kind":"arxiv_version","alias_value":"1707.03583v1","created_at":"2026-05-18T00:40:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.03583","created_at":"2026-05-18T00:40:02Z"},{"alias_kind":"pith_short_12","alias_value":"SUMXFIP6PDOV","created_at":"2026-05-18T12:31:43Z"},{"alias_kind":"pith_short_16","alias_value":"SUMXFIP6PDOV2TLN","created_at":"2026-05-18T12:31:43Z"},{"alias_kind":"pith_short_8","alias_value":"SUMXFIP6","created_at":"2026-05-18T12:31:43Z"}],"graph_snapshots":[{"event_id":"sha256:268acaa051962213f2e58bb7099a57036cdcee854f3c86b2636e878e71b2f238","target":"graph","created_at":"2026-05-18T00:40:02Z","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":"Many properties of the atomic nucleus, such as vibrations, rotations and incompressibility, can be interpreted as due to a two component quantum liquid of protons and neutrons. Electron scattering measurements on stable nuclei demonstrate that their central densities are saturated, as for liquid drops. In exotic nuclei near the limits of mass and charge, with large imbalances in their proton and neutron numbers, the possibility of a depleted central density, or a 'bubble' structure, has been discussed in a recurrent manner since the 1970s. Here we report first experimental evidence that points","authors_text":"2), 3), A. Gade (3), A. Lemasson (2, A. Lepailleur (2), A. Mutschler (1, C. Borcea (4), D. Bazin (3), D. Sohler (5), D. Weisshaar (3), E. Khan (1), F. Recchia (3), F. Rotaru (4), H. Iwasaki (3), J. A. Tostevin, J.P. Ebran, K. Wimmer (3) ((1) IPNO (2) GANIL (3) NSCL (4) IFIN HH (5) ATOMKI), M. Stanoiu (4), M. Vandebrouck (1), O. Sorlin (2), R. Borcea (4), S.R. Stroberg (3), T. Roger (2), Z. Dombradi (5)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2017-07-12T07:54:14Z","title":"A proton density bubble in the doubly magic $^{34}$Si nucleus"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.03583","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":"sha256:5fac766858296b0263d5c84b9fe3f7fc7f718a088894a4459996d65567e10062","target":"record","created_at":"2026-05-18T00:40:02Z","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":"97ee8cd02f9a0db887b79c02db45976e01c6e55396eee316feb4f4be9e154620","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2017-07-12T07:54:14Z","title_canon_sha256":"46242ff95eecd2fc2223a9c0bc4afa4d3c9954431c14f5b2f635e081a6f9c3ae"},"schema_version":"1.0","source":{"id":"1707.03583","kind":"arxiv","version":1}},"canonical_sha256":"951972a1fe78dd5d4d6dcd32208d0f862d31b6ecf337f47623763a8d7ac84ec5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"951972a1fe78dd5d4d6dcd32208d0f862d31b6ecf337f47623763a8d7ac84ec5","first_computed_at":"2026-05-18T00:40:02.764671Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:40:02.764671Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"uPZ5Uss1gKehWLfxLhUpHwcQhjRQQt3hJdVp9hqNHHeFhhl6tA+n1UjKRuvKXJjZBRMcczlNVNBS3g++pVZrBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:40:02.765152Z","signed_message":"canonical_sha256_bytes"},"source_id":"1707.03583","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5fac766858296b0263d5c84b9fe3f7fc7f718a088894a4459996d65567e10062","sha256:268acaa051962213f2e58bb7099a57036cdcee854f3c86b2636e878e71b2f238"],"state_sha256":"ef8cce39479faaef3f29eb5561ae85334a52f67e3f102d50966a077c8bd1841f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ILMMnK8NRunJfPbU6xWyZNzsoyLaZL08AWPlAAFH7S+PReE6rmONmKyCRuihnmksFNaD78rEchWPpnukoZefAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T00:44:02.355293Z","bundle_sha256":"3426f82a1050448413310b8cf7f1744f7835c7dcac61ad19b8bef9647eec5dc2"}}