Precision test of the isobaric multiplet mass equation for the A=32, T=2 quintet
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Masses of the radionuclides Si32,33 and P34 and of the stable nuclides S32 and P31 have been measured with the Low Energy Beam and Ion Trap (LEBIT) Penning trap mass spectrometer. Relative mass uncertainties as low as 3×10-9 have been achieved. The measured mass value of Si32 differs from the literature value by four standard deviations. The precise mass determination of Si32 and S32 have been employed to test the validity of the quadratic form of the isobaric multiplet mass equation (IMME) for the most well known A=32, T=2 isospin quintet. The new experimental results indicate a dramatic breakdown of the model. © 2009 The American Physical Society.
author list (cited authors)
Kwiatkowski, A. A., Barquest, B. R., Bollen, G., Campbell, C. M., Lincoln, D. L., Morrissey, D. J., ... Block, M.