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.
|Number of pages||6|
|Journal||AIP Conference Proceedings|
|Publication status||Published - 2009|
|Event||International Conference on New Aspects of Heavy Ion Collisions near the Coulomb Barrier, FUSION08 - Chicago, IL, United States|
Duration: Sep 22 2008 → Sep 26 2008
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)