{"paper":{"title":"Laboratory measurements compellingly support charge-exchange mechanism for the 'dark matter' $\\sim$3.5 keV X-ray line","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.GA","physics.atom-ph","physics.plasm-ph"],"primary_cat":"astro-ph.HE","authors_text":"2), (2) Institut f\\\"ur Optik und Quantenelektronik, (3) SRON Netherlands Institute for Space Research, 4) ((1) Max-Planck-Institut f\\\"ur Kernphysik, (4) Leiden Observatory, Chintan Shah (1), Friedrich-Schiller-Universit\\\"at, Jelle Kaastra (3, Jos\\'e R. Crespo L\\'opez-Urrutia (1), Leiden University), Liyi Gu (3), Ren\\'e Steinbr\\\"ugge (1), Sorbonnelaan 2, Stepan Dobrodey (1), Sven Bernitt (1","submitted_at":"2016-08-16T20:00:10Z","abstract_excerpt":"The reported observations of an unidentified X-ray line feature at $\\sim$3.5 keV have driven a lively discussion about its possible dark matter origin. Motivated by this, we have measured the \\emph{K}-shell X-ray spectra of highly ionized bare sulfur ions following charge exchange with gaseous molecules in an electron beam ion trap, as a source of or a contributor to this X-ray line. We produce $\\mathrm{S}^{16+}$ and $\\mathrm{S}^{15+}$ ions and let them capture electrons in collision with those molecules with the electron beam turned off while recording X-ray spectra. We observed a charge-exch"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.04751","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"}