6533b855fe1ef96bd12b1991
RESEARCH PRODUCT
Ca-48+Bk-249 Fusion Reaction Leading to Element Z=117: Long-Lived alpha-Decaying (270)Db and Discovery of Lr-266
J KhuyagbaatarA YakushevCh E DuellmannD AckermannL-l AnderssonM AsaiM BlockRa BollH BrandDm CoxM DasguptaX DerkxA Di NittoK EberhardtJ EvenM EversC FahlanderU ForsbergJm GatesN GharibyanP GolubevKe GregorichJh HamiltonW HartmannR-d HerzbergFp HessbergerDj HindeJ HoffmannR HollingerA HuebnerE JaegerB KindlerJv KratzJ KrierN KurzMustapha LaatiaouiS LahiriR LangB LommelM MaitiK MiernikS MinamiA MistryC MokryH NitscheJp OmtvedtGk PangP PapadakisD RenischJ RobertoD RudolphJ RunkeKp RykaczewskiLg SarmientoM SchaedelB SchaustenA SemchenkovDa ShaughnessyP SteineggerJ SteinerEe TereshatovP Thoerle-pospiechK TinschertT Torres De HeidenreichN TrautmannA TuerlerJ UusitaloDe WardM WegrzeckiN WiehlSm Van CleveV Yakushevasubject
superheavy nucleiseparatorgsitascaca-48-inducted reactionsheaviest elementsdescription
The superheavy element with atomic number Z=117 was produced as an evaporation residue in the 48Ca+249Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their α-decay products was studied using a detection setup that allowed measuring decays of single atomic nuclei with half-lives between sub-μs and a few days. Two decay chains comprising seven α decays and a spontaneous fission each were identified and are assigned to the isotope 294117 and its decay products. A hitherto unknown α-decay branch in 270Db (Z=105) was observed, which populated the new isotope 266Lr (Z=103). The identification of the long-lived (T1/2=1.0+1.9−0.4 h) α-emitter 270Db marks an important step towards the observation of even more long-lived nuclei of superheavy elements located on an “island of stability.” ispartof: Physical Review Letters vol:112 issue:17 ispartof: location:United States status: published
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-05-01 |