Related Experiment Video
Updated: Aug 2, 2026

Essential Metal Uptake in Gram-negative Bacteria: X-ray Fluorescence, Radioisotopes, and Cell Fractionation
Published on: February 1, 2018
Masses of 32Ar and 33Ar for fundamental tests
1CERN, Division EP, 1211 Geneva 23, Switzerland and GSI, Planckstrasse 1, 64291 Darmstadt, Germany. Klaus.Blaum@CERN.ch
Abstract:
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.
Related Concept Videos
Atomic Mass
Radioactivity and Nuclear Equations
A nuclide of an element has a specific number of protons and...
Radioactive Decay and Radiometric Dating
Nuclear Transmutation
Isotopes and Radioisotopes
An isotope containing more...
Atomic Absorption Spectroscopy: Lab
Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...

