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

Research output: Contribution to journalArticle

Abstract

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.

Details

Authors
  • J. Khuyagbaatar
  • A. Yakushev
  • Ch. E. Düllmann
  • D. Ackermann
  • L.-L. Andersson
  • M. Block
  • H. Brand
  • D. M. Cox
  • J. Even
  • W. Hartmann
  • R.-D. Herzberg
  • F. P. Heßberger
  • J. Hoffmann
  • A. Hübner
  • E. Jäger
  • J. Jeppsson
  • B. Kindler
  • J. V. Kratz
  • J. Krier
  • N. Kurz
  • B. Lommel
  • M. Maiti
  • S. Minami
  • A. K. Mistry
  • Ch. M. Mrosek
  • I. Pysmenetska
  • H. Schaffner
  • M. Schädel
  • B. Schausten
  • J. Steiner
  • T. Torres De Heidenreich
  • J. Uusitalo
  • M. Wegrzecki
  • N. Wiehl
  • V. Yakusheva
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics

Keywords

  • Heavy Elements, Shell Structure, Sampling Electronics
Original languageEnglish
Article number242502
Number of pages4
JournalPhysical Review Letters
Volume115
Issue number24
Publication statusPublished - 2015
Publication categoryResearch
Peer-reviewedYes

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Research output: Contribution to journalArticle

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