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Accurate mass measurements of very short-lived nuclei

Prerequisites for high-accuracy investigations of superallowed β-decays

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Abstract:

Mass measurements of 34Ar, 73-78Kr, and 74,76Rb were performed with the Penning-trap mass spectrometer ISOLTRAP. Very accurate Q EC-values are needed for the investigations of the t-value of 0+ → 0+ nuclear β-decays used to test the standard model predictions for weak interactions. The necessary accuracy on the Q EC-value requires the mass of mother and daughter nuclei to be measured with δm/m ⩽ 3.10-8. For most of the measured nuclides presented here this has been reached. The 34Ar mass has been measured with a relative accuracy of 1.1.10-8. The QEC-value of the 34Ar 0+ → 0+ decay can now be determined with an uncertainty of about 0.01%. Furthermore, 74Rb is the shortest-lived nuclide ever investigated in a Penning trap.

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Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002

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ID="a"e-mail: frank.herfurth@cern.ch

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Herfurth, F., Kellerbauer, A., Ames, F. et al. Accurate mass measurements of very short-lived nuclei . Eur Phys J A 15, 17–20 (2002). https://doi.org/10.1140/epja/i2001-10216-x

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  • DOI: https://doi.org/10.1140/epja/i2001-10216-x

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