{"paper":{"title":"Observation of Non-Exponential Orbital Electron Capture Decays of Hydrogen-Like $^{140}$Pr and $^{142}$Pm Ions","license":"","headline":"","cross_cats":["hep-ph","nucl-th"],"primary_cat":"nucl-ex","authors_text":"A. Fragner, A. Musumarra, A. Prochazka, B. Fabian, B. Sun, C. Brandau, C. Dimopoulou, C. Kozhuharov, C. Nociforo, C. Scheidenberger, D. Boutin, E. Haettner, F. Bosch, F. Montes, F. Nolden, H. Geissel, H.G. Essel, H. Weick, J. Kurcewicz, K. Beckert, L. Chen, L. Maier, M. Hausmann, M. Mazzocco, M. Steck, M. Trassinelli, M. Winkler, N. Winckler, P. Beller, P. Kienle, R. Kn\\\"obel, R. Reda, R. Reuschl, S.A. Litvinov, S. Hess, S. Torilov, T. Faestermann, T. St\\\"ohlker, W. Pla{\\ss}, Yu.A. Litvinov","submitted_at":"2008-01-14T14:08:53Z","abstract_excerpt":"We report on time-modulated two-body weak decays observed in the orbital electron capture of hydrogen-like $^{140}$Pr$^{59+}$ and $^{142}$Pm$^{60+}$ ions coasting in an ion storage ring. Using non-destructive single ion, time-resolved Schottky mass spectrometry we found that the expected exponential decay is modulated in time with a modulation period of about 7 seconds for both systems. Tentatively this observation is attributed to the coherent superposition of finite mass eigenstates of the electron neutrinos from the weak decay into a two-body final state."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0801.2079","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/0801.2079/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"}