Simultaneous Measurement ofβ−Decay to Bound and Continuum Electron States
| Autor: | Bernhard Franczak, O. Klepper, M. Hausmann, E. Kaza, Yu. N. Novikov, F. Nolden, P. Kienle, B. Franzke, Hans-Jürgen Kluge, Margareta Hellström, M. Matos, P. Beller, Yu. A. Litvinov, M. Steck, F. Attallah, C. Kozhuharov, Helmut Weick, K. Sümmerer, T. Radon, Mauricio Portillo, T. Faestermann, Takayuki Yamaguchi, G. Münzenberg, D. Boutin, Takashi Ohtsubo, Hans Geissel, F. Bosch, J. Stadlmann, M. Winkler, Thomas Stöhlker, C. Scheidenberger, K. Takahashi, K. Beckert, L. Maier |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 95 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.95.052501 |
| Popis: | We report the first measurement of a ratio {lambda}{sub {beta}{sub b}}/{lambda}{sub {beta}{sub c}} of bound-state ({lambda}{sub {beta}{sub b}}) and continuum-state ({lambda}{sub {beta}{sub c}}) {beta}{sup -}-decay rates for the case of bare {sup 207}Tl{sup 81+} ions. These ions were produced at the GSI fragment separator FRS by projectile fragmentation of a {sup 208}Pb beam. After in-flight separation with the B{rho}-{delta}E-B{rho} 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 {sup 207}Tl{sup 81+} ions and their bound-state {beta}{sup -}-decay daughters, hydrogenlike {sup 207}Pb{sup 81+} ions, were measured as a function of storage time by recording their Schottky-noise intensities. The experimental result, {lambda}{sub {beta}{sub b}}/{lambda}{sub {beta}{sub c}}=0.188(18), is in very good agreement with the value of 0.171(1) obtained from theory employing spectra of allowed transitions. |
| Databáze: | OpenAIRE |
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