{"paper":{"title":"Structure of the $^8$B and $^8$Li nuclei and the astrophysical $S_{17}(0)$-factor of the $^7$Be($p,\\gamma$)$^8$B direct capture process within a three-body model","license":"http://creativecommons.org/licenses/by/4.0/","headline":"A three-body model of 8B gives the zero-energy S-factor for 7Be(p,γ)8B as 22.492 eV b.","cross_cats":["astro-ph.SR","nucl-ex"],"primary_cat":"nucl-th","authors_text":"D.S. Toshova, E.M. Tursunov, S.A. Turakulov","submitted_at":"2026-05-04T17:02:17Z","abstract_excerpt":"The structure of the ground $(2^+)$ and excited $(1^+)$ bound states of the $^8$B and $^8$Li nuclei is studied within the framework of the $\\alpha+^3$He($^3$H)+$p(n)$ three-body potential cluster model based on the hyperspherical Lagrange-mesh method. The two-body $\\alpha-^3$He($^3$H), $\\alpha$-N, and $^3$He($^3$H)-N realistic potentials have been applied from the literature. Convergent theoretical estimates for the three-body binding energy and matter radius have been obtained with the maximal hypermomentum $K_{max}=22$ and 28 for the ground and excited $1^+$ states, respectively. The ANC val"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"For the zero-energy astrophysical factor of the direct nuclear capture process 7Be(p,γ)8B an estimate 22.492±0.014 eV b was obtained based on the asymptotic theory developed by D. Baye.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the three-body wave functions obtained with literature two-body potentials, once matched to their asymptotic form, correctly reproduce the ANC that enters the S-factor formula; any systematic error in the potentials or in the three-body truncation directly propagates into the quoted S17(0) value.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"A three-body model gives S17(0) = 22.492 ± 0.014 eV b for 7Be(p,γ)8B, dominated by the spin-2 channel at 20.838 eV b.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"A three-body model of 8B gives the zero-energy S-factor for 7Be(p,γ)8B as 22.492 eV b.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"758351c61c08fba415a720b2920ed85c42c3fce04dff7453a92001122df27a21"},"source":{"id":"2605.02826","kind":"arxiv","version":2},"verdict":{"id":"596e9dc2-534d-4fd3-b134-e8aa306fa307","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-08T17:08:23.850816Z","strongest_claim":"For the zero-energy astrophysical factor of the direct nuclear capture process 7Be(p,γ)8B an estimate 22.492±0.014 eV b was obtained based on the asymptotic theory developed by D. Baye.","one_line_summary":"A three-body model gives S17(0) = 22.492 ± 0.014 eV b for 7Be(p,γ)8B, dominated by the spin-2 channel at 20.838 eV b.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the three-body wave functions obtained with literature two-body potentials, once matched to their asymptotic form, correctly reproduce the ANC that enters the S-factor formula; any systematic error in the potentials or in the three-body truncation directly propagates into the quoted S17(0) value.","pith_extraction_headline":"A three-body model of 8B gives the zero-energy S-factor for 7Be(p,γ)8B as 22.492 eV b."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.02826/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"doi_compliance","ran_at":"2026-05-19T15:56:42.843265Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"f59c44eb8e7cb927ea068851501b28b4b644385d89a0be5f15fec57a292b9db5"},"references":{"count":67,"sample":[{"doi":"","year":null,"title":"739 fm − 1/ 2 in the spin 1 and spin 2 channels, respectively","work_id":"","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2000,"title":"For the zero-energy astrophysical factor of the direct nuclear capture process 7Be(p,γ)8B an estimate S17(0) = 22","work_id":"","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2026,"title":"Structure of the $^8$B and $^8$Li nuclei and the astrophysical $S_{17}(0)$-factor of the $^7$Be($p,\\gamma$)$^8$B direct capture process within a three-body model","work_id":"8294d6af-21a4-4b7c-8bdf-c0823ff677b2","ref_index":3,"cited_arxiv_id":"2605.02826","is_internal_anchor":true},{"doi":"","year":null,"title":"044 fm − 1 [26] was obtained from the analy- sis of the experimental differential cross-sections of the 13C(7Li,8Li)12C transfer reaction in the frame of the DWBA","work_id":"","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"instead of <r 2 3He >1/ 2 as for the second particle. In Fig. 3 we examine a convergence of the calculated matter radii for the ground states of the 8B and 8Li nuclei as a function of Kmax, which vari","work_id":"","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":1,"snapshot_sha256":"4b6330e77ef3ba2e0c7eed1dd4afd14775c1d2c47cda650547fb8d1ac055af7d","internal_anchors":1},"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"}