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Direct determination of the atomic mass difference of Re187 and Os187 for neutrino physics and cosmochronology

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arxiv 1604.04394 v1 pith:FTDNJWT3 submitted 2016-04-15 nucl-ex physics.atom-phphysics.ins-det

Direct determination of the atomic mass difference of Re187 and Os187 for neutrino physics and cosmochronology

classification nucl-ex physics.atom-phphysics.ins-det
keywords massdeterminationdifferenceatomiccosmochronologydirectmeasurementsneutrino
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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For the first time a direct determination of the atomic mass difference of 187Re and 187Os has been performed with the Penning-trap mass spectrometer SHIPTRAP applying the novel phase-imaging ion-cyclotron-resonance technique. The obtained value of 2492(30stat)(15sys) eV is in excellent agreement with the Q values determined indirectly with microcalorimetry and thus resolves a long-standing discrepancy with older proportional counter measurements. This is essential for the determination of the neutrino mass from the beta-decay of 187Re as planned in future microcalorimetric measurements. In addition, an accurate mass difference of 187Re and 187Os is also important for the assessment of 187Re for cosmochronology.

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