Phys. Rev. Lett. 95, 052501 (2005) [4 pages]Simultaneous Measurement of β- Decay to Bound and Continuum Electron StatesSee Also: Publisher's Note Received 22 December 2004; published 25 July 2005; publisher error corrected 28 July 2005 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.052501
DOI:
10.1103/PhysRevLett.95.052501
PACS:
23.40.Hc, 27.80.+w, 29.20.Dh
See AlsoPublisher's Note: T. Ohtsubo et al., Publisher’s Note: Simultaneous Measurement of β- Decay to Bound and Continuum Electron States [Phys. Rev. Lett. 95, 052501 (2005)], Phys. Rev. Lett. 95, 069901 (2005). |
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