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Beta Decay of Molecular Tritium

Lin, Y.-T.; Burritt, T. H.; Claessens, C.; Holman, G.; Kallander, M.; Machado, E.; Minter, L. I.; Ostertag, R.; Parno, D. S.; Pedersen, J.; Peterson, D. A.; Robertson, R. G. H.; Smith, E. B.; Van Wechel, T. D.; Vizcaya Hernández, A. P.; Collaboration, TRIMS

The beta decay of tritium in the form of molecular TT is the basis of sensitive experiments to measure neutrino mass. The final-state electronic, vibrational, and rotational excitations modify the beta spectrum significantly, and are obtained from theory. We report measurements of the branching ratios to specific ionization states for the isotopolog HT. Two earlier, concordant measurements gave branching ratios of HT to the bound HHe+ ion of 89.5% and 93.2%, in sharp disagreement with the theoretical prediction of 55-57%, raising concerns about the theory's reliability in neutrino mass experiments. Our result, 56.5(6)%, is compatible with the theoretical expectation and disagrees strongly with the previous measurements.

Zugehörige Institution(en) am KIT Institut für Experimentelle Teilchenphysik (ETP)
Publikationstyp Forschungsbericht/Preprint
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0031-9007, 1079-7114, 1092-0145
KITopen-ID: 1000122557
Umfang 6 S.
Schlagwörter Nuclear Experiment (nucl-ex)
Nachgewiesen in arXiv
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