Masses of 32Ar and 33Ar for fundamental tests.
Masses of the short-lived radionuclides 32Ar (T(1/2)=98 ms) and 33Ar (T(1/2)=173 ms) have been determined with the Penning trap mass spectrometer ISOLTRAP. Relative uncertainties of 6.0x10(-8) (deltam=1.8 keV) and 1.4x10(-8) (deltam=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 20sigma deviation for 44Ar from the literature value was found and interpreted.
Blaum
K
K
CERN, Division EP, 1211 Geneva 23, Switzerland and GSI, Planckstrasse 1, 64291 Darmstadt, Germany. Klaus.Blaum@CERN.ch
Audi
G
G
Beck
D
D
Bollen
G
G
Herfurth
F
F
Kellerbauer
A
A
Kluge
H-J
HJ
Sauvan
E
E
Schwarz
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