Mainz 2017 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 1: Precision Mass Spectrometry and Fundamental Applications I
MS 1.2: Hauptvortrag
Montag, 6. März 2017, 15:00–15:30, RW 2
Precision mass measurements in the context of neutrino-nuclear physics — •Milad Alanssari1, Dieter Frekers2, and Tommi Eronen3 — 1University Muenster, Inst. f. Nucl. Phys., 48149 Muenster, Germany — 2University Muenster, Inst. f. Nucl. Phys., 48149 Muenster, Germany — 3University Jyvaskyla, Dept of Phys., Jyvaskyla FI-40014, Finland
High-precision mass measurements will be presented. The overall context is neutrino-nuclear physics. The measurements were performed at the IGISOL/JYFLTRAP facility of the University of Jyvaskyla, Finland.
After a brief and general introduction about precision mass measurements, double beta-decay and neutrino physics, emphasis will be on mass determinations for the A=96 triplet, i.e., 96Zr, 96Nb, and 96Mo. Of special importance is the 96Zr to 96Nb single beta-decay Q-value. The single beta-decay is an alternative decay to the 96Zr double beta-decay, and its observation could provide one of the most direct tests of theoretical models aimed at calculating the neutrinoless double beta-decay. The decay may also shed light onto the quenching of the axial-vector coupling constant gA.
The second part centers around a precision measurement of the 71Ga to 71Ge neutrino reaction Q-value. This Q-value had been discussed in the context of the "gallium anomaly" observed in the calibration of the SAGE and GALLEX neutrino detectors. The present precision value finally excludes the possibility of the observed "anomaly" being the result of wrongly assumed nuclear physics input.