6533b86efe1ef96bd12cc492
RESEARCH PRODUCT
New Short-Lived Isotope U-221 and the Mass Surface Near N=126
J KhuyagbaatarA YakushevCh E DuellmannD AckermannL-l AnderssonM BlockH BrandDm CoxJ EvenU ForsbergP GolubevW HartmannR-d HerzbergFp HessbergerJ HoffmannA HuebnerE JaegerJ JeppssonB KindlerJv KratzJ KrierN KurzB LommelM MaitiS MinamiAk MistryCh M MrosekI PysmenetskaD RudolphLg SarmientoH SchaffnerM SchaedelB SchaustenJ SteinerT Torres De HeidenreichJ UusitaloM WegrzeckiN WiehlV Yakushevasubject
description
Two short-lived isotopes 221U and 222U were produced as evaporation residues in the fusion reaction 50Ti+176Yb at the gas-filled recoil separator TASCA. An α decay with an energy of Eα=9.31(5) MeV and half-life T1/2=4.7(7) μs was attributed to 222U. The new isotope 221U was identified in α-decay chains starting with Eα=9.71(5) MeV and T1/2=0.66(14) μs leading to known daughters. Synthesis and detection of these unstable heavy nuclei and their descendants were achieved thanks to a fast data readout system. The evolution of the N=126 shell closure and its influence on the stability of uranium isotopes are discussed within the framework of α-decay reduced width.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-12-11 |