Decay Study of {sup 257}Rf

Journal Article · Wed Mar 04 04:00:00 EST 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3108843· OSTI ID:21289479

Qian, J; Heinz, A; Winkler, R ^[1]; Janssens, R V. F.; Khoo, T L; Seweryniak, D; Peterson, D; Back, B B; Carpenter, M P; Greene, J P; Jiang, C L; Kondev, F G; Lauritsen, T; Lister, C J; Pardo, R C; Robinson, A; Scott, R; Vondrasek, R; Wang, X; Zhu, S ^[2]

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1. Yale University, New Haven, CT 06511 (United States)
2. Argonne National Laboratory, Argonne, IL 60439 (United States)

The isotope {sup 257}Rf was produced in the fusion-evaporation reaction {sup 208}Pb({sup 50}Ti, n){sup 257}Rf. Reaction products were separated by the Argonne Fragment Mass Analyzer. Radioactive decay and spontaneous fission of {sup 257}Rf and its decay products were investigated. An isomeric state in {sup 257}Rf, with a half-life of 160{sub -31}{sup 42} {mu}S, 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 a half-life of 4.1{sub -1.3}{sup +2.4} s, was observed. These events might originate from the decay of excited states in {sup 257}Lr, populated by electron-capture decay of {sup 257}Rf, or from another isomer in {sup 257}Rf.

• OSTI ID: 21289479
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1098; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY
ELECTRON CAPTURE DECAY
EXCITED STATES
HALF-LIFE
HEAVY ION FUSION REACTIONS
INTERNAL CONVERSION
ISOMERIC NUCLEI
LAWRENCIUM 257
LEAD 208 TARGET
RUTHERFORDIUM 257
SPONTANEOUS FISSION
TITANIUM 50 REACTIONS