Accurate mass measurements of very short-lived nuclei

Mass measurements of /sup 34/Ar, /sup 73-78/Kr, and /sup 74,76/Rb were performed with the Penning-trap mass spectrometer ISOLTRAP. Very accurate Q/sub EC/-values are needed for the investigations of the F /sub t/-value of 0/sup +/ to 0/sup +/ nuclear beta -decays used to test the standard model pred...

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Detalles Bibliográficos
Autores principales: Herfurth, F, Kellerbauer, A G, Ames, F, Audi, G, Beck, D, Blaum, K, Bollen, G, Engels, O, Kluge, H J, Lunney, M D, Moores, R B, Oinonen, M, Sauvan, E, Bolle, C A, Scheidenberger, C, Schwarz, S, Sikler, G, Weber, C
Lenguaje:eng
Publicado: 2002
Materias:
Nuclear Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1140/epja/i2001-10216-x
http://cds.cern.ch/record/623219
Descripción
Sumario:Mass measurements of /sup 34/Ar, /sup 73-78/Kr, and /sup 74,76/Rb were performed with the Penning-trap mass spectrometer ISOLTRAP. Very accurate Q/sub EC/-values are needed for the investigations of the F /sub t/-value of 0/sup +/ to 0/sup +/ nuclear beta -decays used to test the standard model predictions for weak interactions. The necessary accuracy on the Q/sub EC/-value requires the mass of mother and daughter nuclei to be measured with delta m/m<or=3.10/sup -8/. For most of the measured nuclides presented here this has been reached. The /sup 34/Ar mass has been measured with a relative accuracy of 1.1.10/sup -8/. The Q/sub EC/-value of the /sup 34/Ar 0 /sup +/ to 0/sup +/ decay can now he determined with an uncertainty of about 0.01%. Furthermore, /sup 74/Rb is the shortest-lived nuclide ever investigated in a Penning trap. (18 refs).

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