{"paper":{"title":"Determination of the 3\\gamma fraction from positron annihilation in mesoporous materials for symmetry violation experiment with J-PET scanner","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.ins-det"],"primary_cat":"nucl-ex","authors_text":"A. Gajos, A. S{\\l}omski, A. Strzelecki, A.Wieczorek, B. G{\\l}owacz, B. Jasi\\'nska, B. Zgardzi\\'nska, D. Alfs, D. Kami\\'nska, E. Czerwi\\'nski, E. Kubicz, G. Korcyl, K. Dulski, {\\L}. Kap{\\l}on, L. Raczy\\'nski, M. Gorgol, M. Mohammed, M. Pa{\\l}ka, M. Silarski, M. Wiertel, M. Zieli\\'nski, N.G. Sharma, O. Rundel, P. Bia{\\l}as, P. Kowalski, P. Moskal, R. Zaleski, Sz. Nied\\'zwiecki, T. Bednarski, T. Kozik, W. Krzemie\\'n, W. Wi\\'slicki, Z. Rudy","submitted_at":"2016-02-17T11:20:13Z","abstract_excerpt":"Various mesoporous materials were investigated to choose the best material for experiments requiring high yield of long-lived positronium. We found that the fraction of 3\\gamma annihilation determined using \\gamma-ray energy spectra and positron annihilation lifetime spectra (PAL) changed from 20% to 25%. The 3gamma fraction and o-Ps formation probability in the polymer XAD-4 is found to be the largest. Elemental analysis performed using scanning electron microscop (SEM) equipped with energy-dispersive X-ray spectroscop EDS show high purity of the investigated materials."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.05376","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"}