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MS: Massenspektrometrie
MS 5: Präzisions-MS kurzlebiger Nuklide 1
MS 5.1: Gruppenbericht
Mittwoch, 15. März 2006, 14:00–14:30, H1
New atomic masses related to fundamental physics measured with SMILETRAP — •Szilard Nagy1, Tomas Fritioff1, Markus Suhonen1, Andreas Solders1, Ingmar Bergström2, and Reinhold Schuch1 — 1AlbaNova University Center, Atomic Physics, S-106 91 Stockholm, Sweden — 2Manne Siegbahn Laboratory (MSL),Frescativägen 24, S-104 05 Stockholm, Sweden
Some recent improvements of the SMILETRAP Penning trap mass spectrometer together with a number of interesting high precision mass measurements will be presented which are relevant to several of today’s fundamental physics problems. The masses of the hydrogen- and lithium-like 40Ca ions have been determined recently, these values being indispensable when evaluating g-factor measurements of the bound electron. The uncertainty in the mass was improved by one order of magnitude compared to available literature values. A new mass value for 7Li has been obtained with an unprecedented relative uncertainty of 6.3×10−10. A large deviation of 1.1 µu (160ppb) compared to the literature value has been observed. The mass difference between 3He and 3H is the Q-value of the tritium β-decay which is of importance in the search for a finite rest mass of the electron antineutrino. By adding an accurate measurement of the mass of 3He1+ to previous mass measurements of 3H1+ and 3He2+, we have improved our previous Q-value by a factor of 2. The current Q-value determined by Smiletrap mass measurements is the most accurate and more importantly, it is based on the correct atomic mass values.