{"paper":{"title":"Development of Ultra-pure Gadolinium Sulfate for the Super-Kamiokande Gadolinium Project","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"physics.ins-det","authors_text":"E. Meehan, H. Ito, H. Sekiya, I. Bandac, J. Perez, K. Hosokawa, K. Ichimura, L. F. Thompson, L. Labarga, M. D. Thiesse, M. Harada, M. Ikeda, M. R. Vagins, P. Fernandez, P. R. Scovell, S. Ito, T. Okada, Y. Kishimoto, Y. Koshio, Y. Nakajima, Y. Takaku, Y. Tanaka, Y. Yamaguchi","submitted_at":"2022-09-13T20:12:40Z","abstract_excerpt":"This paper reports the development and detailed properties of about 13 tons of gadolinium sulfate octahydrate, $\\rm Gd_2(\\rm SO_4)_3\\cdot \\rm 8H_2O$, which has been dissolved into Super-Kamiokande (SK) in the summer of 2020. We evaluate the impact of radioactive impurities in $\\rm Gd_2(\\rm SO_4)_3\\cdot \\rm 8H_2O$ on DSNB searches and solar neutrino observation and confirm the need to reduce radioactive and fluorescent impurities by about three orders of magnitude from commercially available high-purity $\\rm Gd_2(\\rm SO_4)_3\\cdot \\rm 8H_2O$. In order to produce ultra-high-purity $\\rm Gd_2(\\rm S"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2209.07273","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2209.07273/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}