Abstract
Asays of 209Po by 4πα liquid scintillation (LS) measurements are confounded by an α-transition to a 2.3 keV ( J π = 1 2 − ) level in 205Pb which was previously unknown to be a delayed isomeric state. The level is believed to be populated by a substantial fraction of the total 209Po decay (∼80%), and presumably decays predominantly by internal conversion. The resulting conversion electrons from this delayed isomeric transition were identified in LS spectra. The lifetime is inferred to be at least several times 10 −5 s, although it may very well be substantially longer lived by orders of magnitude. The implications of these findings for routine measurements of 209Po by LS are discussed. Suggested experiments to precisely determine the lifetime of the state are also proposed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
