Simultaneous Measurement of {beta}{sup -} Decay to Bound and Continuum Electron States
- Gesellschaft fuer Schwerionenforschung (GSI), 64291 Darmstadt (Germany)
- Gesellschaft fuer Schwerionenforschung (GSI), 64291 Darmstadt (Germany); and others
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.
- OSTI ID:
- 20699255
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 95; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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