Decay study of257Rf

J. Qian, A. Heinz, R. Winkler, R. V.F. Janssens, T. L. Khoo, D. Seweryniak, D. Peterson, M. Asai, B. B. Back, M. P. Carpenter, A. B. Garnsworthy, J. P. Greene, A. A. Hecht, C. L. Jiang, F. G. Kondev, T. Lauritsen, C. J. Lister, R. C. Pardo, A. Robinson, R. ScottR. Vondrasek, X. Wang, S. Zhu

Research output: Contribution to journalConference articlepeer-review


The isotope 257Rf was produced in the fusion-evaporation reaction 208Pb (50Ti, n) 257Rf. Reaction products were separated by the Argonne Fragment Mass Analyzer. Radioactive decay and spontaneous fission of 257Rf and its decay products were investigated. An isomeric state in 257Rf, with a half-life of 160-3142μS , was discovered by detecting internal conversion electrons followed by alpha decays. It is interpreted as a three-quasiparticle high-K isomer. A second group of internal-conversion electrons which were succeeded by alpha decay, with ahalf-life of 4.1 s+2.24 was observed. These events might originate from the decay of excited states in 257Lr, populated by electron-capture decay of 257, or from another isomer in 257Rf.

Original languageEnglish
Pages (from-to)314-319
Number of pages6
JournalAIP Conference Proceedings
Publication statusPublished - 2009
Externally publishedYes
EventInternational Conference on New Aspects of Heavy Ion Collisions near the Coulomb Barrier, FUSION08 - Chicago, IL, United States
Duration: Sept 22 2008Sept 26 2008

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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