6533b852fe1ef96bd12ab5d0
RESEARCH PRODUCT
Direct Measurement of the Mass Difference ofHo163andDy163Solves theQ-Value Puzzle for the Neutrino Mass Determination
Christian EnssKlaus BlaumUlli KösterYu. N. NovikovYu. N. NovikovYu. N. NovikovMikhail GoncharovAndreas TürlerAndreas TürlerF. LautenschlägerR. X. SchüsslerPavel FilianinPavel FilianinMichael BlockAlexander RischkaS. ChenmarevS. ChenmarevLoredana GastaldoH. DorrerH. DorrerH. DorrerCh. E. DüllmannSergey EliseevLutz Schweikhardsubject
Physics010308 nuclear & particles physicsElectron captureQ valueElectron rest massGeneral Physics and AstronomyMass spectrometry7. Clean energy01 natural sciencesBeta decayAtomic massNuclear physicsAtomic mass constant0103 physical sciencesNeutrino010306 general physicsdescription
The atomic mass difference of (163)Ho and (163)Dy 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 (163)Ho 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 7σ 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-08-05 | Physical Review Letters |