期刊
PHYSICAL REVIEW LETTERS
卷 115, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.062501
关键词
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资金
- DFG [FOR 2202]
- Max-Planck Society
- IMPRS-PTFS
- EU (ERC) [290870-MEFUCO]
- German BMBF [05P12HGFN5, 05P12HGFNE, 01DJ14002]
- Russian Ministry of Education and Science [2.2]
- Johannes Gutenberg University Mainz
The atomic mass difference of Ho-163 and Dy-163 has been directly measured with the Penning-trap mass spectrometer SHIPTRAP applying the novel phase-imaging ion-cyclotron-resonance technique. Our measurement has solved the long-standing problem of large discrepancies in the Q value of the electron capture in 163Ho determined by different techniques. Our measured mass difference shifts the current Q value of 2555(16) eV evaluated in the Atomic Mass Evaluation 2012 [G. Audi et al., Chin. Phys. C 36, 1157 (2012)] by more than 7s to 2833(30(stat))(15(sys)) eV/c(2). With the new mass difference it will be possible, e.g., to reach in the first phase of the ECHo experiment a statistical sensitivity to the neutrino mass below 10 eV, which will reduce its present upper limit by more than an order of magnitude.
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