Masses of Ar-32 and Ar-33 for Fundamental Tests

TitleMasses of Ar-32 and Ar-33 for Fundamental Tests
Publication TypeJournal Article
Year of Publication2003
AuthorsBlaum, K., Audi G., Beck D., Bollen G., Herfurth F., Kellerbauer A., Kluge H. - J., Sauvan E., and Schwarz S.
Refereed DesignationUnknown
JournalPhys. Rev. Lett.
Date Published12/2003
Citation KeyPhysRevLett.91.260801
Full Text

Masses of the short-lived radionuclides 32Ar (T1/2=98   ms) and 33Ar (T1/2=173   ms) have been determined with the Penning trap mass spectrometer ISOLTRAP. Relative uncertainties of 6.0×10-8 (δm=1.8   keV) and 1.4×10-8 (δm=0.44   keV), respectively, have been achieved. At present, these new mass data serve as the most stringent test of the quadratic form of the isobaric-multiplet mass equation. Furthermore, the improved accuracy for the mass of 32Ar will allow for a better constraint on scalar contributions to the weak interaction. New mass values have also been measured for 44Ar and 45Ar, and a 20σ deviation for 44Ar from the literature value was found and interpreted.

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