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Ryjkov","submitted_at":"2011-07-08T17:58:12Z","abstract_excerpt":"The first direct mass-measurement of $^{6}$He has been performed with the TITAN Penning trap mass spectrometer at the ISAC facility. In addition, the mass of $^{8}$He was determined with improved precision over our previous measurement. The obtained masses are $m$($^{6}$He) = 6.018 885 883(57) u and $m$($^{8}$He) = 8.033 934 44(11) u. The $^{6}$He value shows a deviation from the literature of 4$\\sigma$. With these new mass values and the previously measured atomic isotope shifts we obtain charge radii of 2.060(8) fm and 1.959(16) fm for $^{6}$He and $^{8}$He respectively. We present a detaile"},"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":"1107.1684","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2011-07-08T17:58:12Z","cross_cats_sorted":[],"title_canon_sha256":"96870ac42ffe6fb1e7f562d24c420e558023b29f0bd4c42863a234b5577b76c0","abstract_canon_sha256":"4ae54ab0702cfb7a314dc5dce52d1b77b61650107f360edf186b87accec7c334"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:01:21.167587Z","signature_b64":"wYbg6EsUO/CTd91N5UQkp+Xv638vReFnAW/tHyvQriP8ieslGUKf3gR7ru876PXhm6Am6BRmIgXd31mX78AKAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"363d0ecfffc170d761b72f057207e51773b812d10401ca2009ff2f1f558fa0e7","last_reissued_at":"2026-05-18T02:01:21.166572Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:01:21.166572Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"First direct mass-measurement of the two-neutron halo nucleus 6He and improved mass for the four-neutron halo 8He","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. 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