Production and investigation of tungsten <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>α</mi></math> emitters including the new isotopes, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">W</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>165</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">W</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>166</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math>

K. S. Toth; W. -D. Schmidt-Ott; C. R. Bingham; M. A. Ijaz

doi:10.1103/PhysRevC.12.533

Production and investigation of tungsten $α$ emitters including the new isotopes, ${}^{165}W$ and ${}^{166}W$

K. S. Toth, W. -D. Schmidt-Ott, C. R. Bingham, and M. A. Ijaz

Phys. Rev. C 12, 533 – Published 1 August 1975

Abstract

Neutron-deficient tungsten isotopes were produced by bombarding an enriched ${}^{156}{Dy}$ target with ${}^{16}O$ ions accelerated in the Oak Ridge isochronous cyclotron. A gas-jet-capillary system was used to transport product nuclei to an area where their $α$ -decay properties could be investigated. The data of Eastham and Grant concerning ${}^{162, 163, 164}W$ were confirmed. In addition, two new weak $α$ groups were observed. On the basis of excitation functions, ${}^{14}N$ + ${}^{156}{Dy}$ cross bombardments, and $α$ -decay energy systematics they were assigned to the new isotopes ${}^{165}W$ and ${}^{166}W$ . Their decay properties are as follows: (1) ${}^{165}W$ , $E_{α} = 4.909 \pm 0.005$ MeV, $T_{\frac{1}{2}} = 5.1 \pm 0.5$ sec, and (2) ${}^{166}W$ , $E_{α} = 4.739 \pm 0.005$ MeV, $T_{\frac{1}{2}} = 16 \pm 3$ sec.

RADIOACTIVITY ${}^{162, 163, 164, 165, 166}W$ ; measured $E_{α}$ , $T_{\frac{1}{2}}$ ; discovered new isotopes ${}^{165, 166}W$ .

Received 28 April 1975

DOI:https://doi.org/10.1103/PhysRevC.12.533

Authors & Affiliations

K. S. Toth

Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830

W. -D. Schmidt-Ott^*,†

UNISOR, Oak Ridge, Tennessee 37830

C. R. Bingham

University of Tennessee, Knoxville, Tennessee 37916

M. A. Ijaz

Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061

^*Present address: Physikalisches Institut der Universität Göttingen, Göttingen, Germany.
^†UNISOR is a consortium of University of Alabama, Emory University, Furman University, Georgia Institute of Technology, University of Kentucky, Louisiana State University, University of Massachusetts, Oak Ridge National Laboratory, Oak Ridge Associated Universities, University of South Carolina, University of Tennessee, Tennessee Technological University, Vanderbilt University, and Virginia Polytechnic Institute. It is supported by these institutions and by ERDA.

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Vol. 12, Iss. 2 — August 1975

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