New Short-Lived Isotope U-221 and the Mass Surface Near N=126

Khuyagbaatar, J, Yakushev, A, Duellmann, Ch E, Ackermann, D, Andersson, L-L, Block, M, Brand, H, Cox, DM, Even, J, Forsberg, U
et al (show 29 more authors) (2015) New Short-Lived Isotope U-221 and the Mass Surface Near N=126. PHYSICAL REVIEW LETTERS, 115 (24).

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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.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 21 Apr 2017 13:17
Last Modified: 27 Sep 2021 20:10
DOI: 10.1103/PhysRevLett.115.242502
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