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For progenitors of ~8M_sun, 7Li(3H,n_0)9Be occurs during the rapid expansion of the shocked He shell. Alternatively, for ultra-metal-poor progenitors of ~11-15M_sun, 7Li(n,gamma)8Li(n,gamma)9Li(e^-anti-nu_e)9Be occurs with neutrons produced by 4He(anti-nu_e,e^+n)3H, assuming a hard effective anti-nu_e spectrum from oscillations (which also leads to heavy element production through rapid neutron "},"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":"1211.5860","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-11-26T05:39:43Z","cross_cats_sorted":["nucl-th"],"title_canon_sha256":"5b14aa20a06faabc8ccbb364124e49680c5ad0ce7b66ba76e63ebb97d0cd2938","abstract_canon_sha256":"10a52e07c80dcf45a64a4a07d2321e67748fb7ae351a7f11f358d9e8266e9b3c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:52:55.221927Z","signature_b64":"KtY8J+DDSBxfsifqVCo8zd1SMwWbn78sRbqt7tYQO+UbsJ1FyQcoDb6Q/REIq5rQtW8FZM9MIjSjtACxQfuGAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9ff5a2d85191c3694f847149ff04150fba523bd74db8ed481664656e3986b9a0","last_reissued_at":"2026-05-18T01:52:55.221284Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:52:55.221284Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"New Primary Mechanisms for the Synthesis of Rare 9Be in Early Supernovae","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"astro-ph.SR","authors_text":"(2) UMN, (3) Monash), A. 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