α decay of the new isotope 206Ac

K. Eskola, P. Kuusiniemi, M. Leino, J. F. C. Cocks, T. Enqvist, S. Hurskanen, H. Kettunen, W. H. Trzaska, J. Uusitalo, R. G. Allatt, P. T. Greenlees, and R. D. Page
Phys. Rev. C 57, 417 – Published 1 January 1998
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Abstract

The new neutron-deficient nuclide 206Ac was produced by bombarding a 175Lu target with 5.5 MeV/nucleon 36Ar ions. The evaporation residues were separated in flight by a gas-filled separator and subsequently identified by the α-α position and time correlation method. 206Ac was found to have two α particle emitting isomeric levels with half-lives of (225+9) ms and (339+22) ms, and with α particle energies of (7790±30) keV and (7750±20) keV, respectively. The former isomer is tentatively assigned to a Jπ=3+ level and the latter to a Jπ=10 level, both of which are also seen in the daughter and granddaughter nuclides 202Fr and 198At. Improved values of (276+11) ms and (7693±25) keV for the half-life and α particle energy of 207Ac are also reported.

  • Received 18 September 1997

DOI:https://doi.org/10.1103/PhysRevC.57.417

©1998 American Physical Society

Authors & Affiliations

K. Eskola

  • Department of Physics, University of Helsinki, FIN-00014 Helsinki, Finland

P. Kuusiniemi, M. Leino, J. F. C. Cocks, T. Enqvist*, S. Hurskanen, H. Kettunen, W. H. Trzaska, and J. Uusitalo

  • Department of Physics, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland

R. G. Allatt, P. T. Greenlees, and R. D. Page

  • Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom

  • *Present address: Gesellschaft für Schwerionenforschung, D-64220 Darmstadt, Germany.
  • Present address: Argonne National Laboratory, Argonne Il 60439.

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Vol. 57, Iss. 1 — January 1998

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