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Simultaneous measurement of β- decay to bound and continuum electron states

We report the first measurement of a ratio λβb/λβc of bound-state (λβb) and continuum-state (λβc) β−-decay rates for the case of bare 207Tl81+ ions. These ions were produced at the GSI fragment separator FRS by projectile fragmentation of a 208Pb beam. After in-flight separation with the Bρ−ΔE−Bρ me...

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Bibliographic Details
Main Authors: Ohtsubo, Takashi (Author) , Kluge, Heinz-Jürgen (Author)
Format: Article (Journal)
Language:English
Published: 28 July 2005
In: Physical review letters
Year: 2005, Volume: 95, Issue: 5
ISSN:1079-7114
DOI:10.1103/PhysRevLett.95.052501
Online Access:Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevLett.95.052501
Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.95.052501
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Author Notes:T. Ohtsubo, F. Bosch, H. Geissel, L. Maier, C. Scheidenberger, F. Attallah, K. Beckert, P. Beller, D. Boutin, T. Faestermann, B. Franczak, B. Franzke, M. Hausmann, M. Hellström, E. Kaza, P. Kienle, O. Klepper, H.-J. Kluge, C. Kozhuharov, Yu.A. Litvinov, M. Matos, G. Münzenberg, F. Nolden, Yu. N. Novikov, M. Portillo, T. Radon, J. Stadlmann, M. Steck, T. Stöhlker, K. Sümmerer, K. Takahashi, H. Weick, M. Winkler, and T. Yamaguchi
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Summary:We report the first measurement of a ratio λβb/λβc of bound-state (λβb) and continuum-state (λβc) β−-decay rates for the case of bare 207Tl81+ ions. These ions were produced at the GSI fragment separator FRS by projectile fragmentation of a 208Pb beam. After in-flight separation with the Bρ−ΔE−Bρ method, they were injected into the experimental storage-ring ESR at an energy of 400.5A MeV, stored, and electron cooled. The number of both the 207Tl81+ ions and their bound-state β−-decay daughters, hydrogenlike 207Pb81+ ions, were measured as a function of storage time by recording their Schottky-noise intensities. The experimental result, λβb/λβc=0.188(18), is in very good agreement with the value of 0.171(1) obtained from theory employing spectra of allowed transitions.
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Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.95.052501

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