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Phys. Rev. Lett. 91, 260801 (2003) [4 pages]

Masses of 32Ar and 33Ar for Fundamental Tests

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K. Blaum1,2 *, G. Audi3, D. Beck2, G. Bollen4, F. Herfurth1, A. Kellerbauer1, H.-J. Kluge2, E. Sauvan1 †, and S. Schwarz4
1CERN, Division EP, 1211 Geneva 23, Switzerland
2GSI, Planckstraße 1, 64291 Darmstadt, Germany
3CSNSM-IN2P3-CNRS, 91405 Orsay-Campus, France
4NSCL, Michigan State University, East Lansing, Michigan 48824-1321, USA

Received 7 May 2003; published 24 December 2003

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.


©2003 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.91.260801
DOI: 10.1103/PhysRevLett.91.260801
PACS: 21.10.Dr, 07.75.+h, 27.30.+t, 32.10.Bi

* Electronic address: Klaus.Blaum@CERN.ch
† Present address: IN2P3, CPPM, 13288 Marseille, France.

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