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Pavel Golubev

Pavel Golubev

Senior lecturer

Pavel Golubev

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

Author

  • J. Khuyagbaatar
  • A. Yakushev
  • Ch. E. Düllmann
  • D. Ackermann
  • L.-L. Andersson
  • M. Block
  • H. Brand
  • D. M. Cox
  • J. Even
  • Ulrika Forsberg
  • Pavel Golubev
  • 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
  • Dirk Rudolph
  • Luis Sarmiento
  • H. Schaffner
  • M. Schädel
  • B. Schausten
  • J. Steiner
  • T. Torres De Heidenreich
  • J. Uusitalo
  • M. Wegrzecki
  • N. Wiehl
  • V. Yakusheva

Summary, in English

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.

Department/s

  • Nuclear physics

Publishing year

2015

Language

English

Publication/Series

Physical Review Letters

Volume

115

Issue

24

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Keywords

  • Heavy Elements
  • Shell Structure
  • Sampling Electronics

Status

Published

Project

  • Nuclear Structure at the Limits: Isotope-selective Spectroscopy

Research group

  • Nuclear Structure

ISBN/ISSN/Other

  • ISSN: 1079-7114