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Accurate mass measurements of very short-lived nuclei |
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| Authors: | F Herfurth A Kellerbauer F Ames G Audi D Beck K Blaum G Bollen O Engels H-J Kluge D Lunney RB Moore M Oinonen E Sauvan C Scheidenberger S Schwarz G Sikler C Weber |
| Institution: | CERN, 1211 Geneva 23, Switzerland, CH Sektion Physik, Ludwig-Maximilians-Universit?t München, 85748 Garching, Germany, DE CSNSM-IN2P3-CNRS, 91405 Orsay Campus, France, FR GSI, Planckstra?e 1, 64291 Darmstadt, Germany, DE NSCL, Michigan State University, East Lansing MI 48824-1321, USA, US Department of Physics, McGill University, Montréal (Québec) H3A 2T8, Canada, CA Helsinki Institute of Physics, University of Helsinki, P.O. Box 9, 00014 Helsinki, Finland, FI |
| 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 Q EC-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. Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002 RID="a" ID="a"e-mail: frank.herfurth@cern.ch |
| Keywords: | PACS 21 10 Dr Binding energies and masses – 24 80 +y Nuclear tests of fundamental interactions and symmetries |
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