α decay studies of the nuclides U218 and U219

A. P. Leppänen, J. Uusitalo, M. Leino, S. Eeckhaudt, T. Grahn, P. T. Greenlees, P. Jones, R. Julin, S. Juutinen, H. Kettunen, P. Kuusiniemi, P. Nieminen, J. Pakarinen, P. Rahkila, C. Scholey, and G. Sletten
Phys. Rev. C 75, 054307 – Published 4 May 2007

Abstract

Very neutron deficient uranium isotopes were produced in fusion evaporation reactions using Ar40 ions on W182 targets. The gas-filled recoil separator RITU was employed to collect the fusion products and to separate them from the scattered beam and other reaction products. The activities were implanted into a position sensitive silicon detector after passing through a gas-counter system. The isotopes were identified using spatial and time correlations between the implants and the decays. Two α-decaying states, with Eα=(8612±9) keV and T1/2=(0.510.10+0.17) ms for the ground state and Eα=(10678±17) keV and T1/2=(0.560.14+0.26) ms for an isomeric state, were identified in U218. In addition, the half-life and α-decay energy of U219 were measured with improved precision. The measured decay properties deduced for U218 suggest that there is no subshell closure at Z=92.

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  • Received 9 May 2006

DOI:https://doi.org/10.1103/PhysRevC.75.054307

©2007 American Physical Society

Authors & Affiliations

A. P. Leppänen1,*, J. Uusitalo1, M. Leino1, S. Eeckhaudt1, T. Grahn1,†, P. T. Greenlees1, P. Jones1, R. Julin1, S. Juutinen1, H. Kettunen1, P. Kuusiniemi1,‡, P. Nieminen1,§, J. Pakarinen1,∥, P. Rahkila1, C. Scholey1, and G. Sletten2

  • 1Department of Physics, University of Jyväskylä, P. O. Box 35, FI-40014 Jyväskylä, Finland
  • 2Department of Physics, University of Copenhagen, Copenhagen, Denmark

  • *Present address: Radiation Nuclear Safety Authority STUK, Rovaniemi, Finland.
  • Present address: Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom.
  • Present address: Centre for Underground Physics in Pyhäsalmi CUPP, Pyhäjärvi, Finland
  • §Present address: Australian National University, Canberra ACT0200, Australia.
  • Present address: Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom.

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Vol. 75, Iss. 5 — May 2007

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