On-line mass separator investigation of the new isotope 2.9-sec <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">I</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>116</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

G. M. Gowdy; A. C. Xenoulis; J. L. Wood; K. R. Baker; R. W. Fink; J. L. Weil; B. D. Kern; K. J. Hofstetter; E. H. Spejewski; R. L. Mlekodaj; H. K. Carter; W. D. Schmidt-Ott; J. Lin; C. R. Bingham; L. L. Riedinger; E. F. Zganjar; K. S. R. Sastry; A. V. Ramayya; J. H. Hamilton

doi:10.1103/PhysRevC.13.1601

On-line mass separator investigation of the new isotope 2.9-sec ${}^{116}I$

G. M. Gowdy, A. C. Xenoulis, J. L. Wood, K. R. Baker, R. W. Fink, J. L. Weil, B. D. Kern, K. J. Hofstetter, E. H. Spejewski, R. L. Mlekodaj, H. K. Carter, W. D. Schmidt-Ott, J. Lin, C. R. Bingham, L. L. Riedinger, E. F. Zganjar, K. S. R. Sastry, A. V. Ramayya, and J. H. Hamilton

Phys. Rev. C 13, 1601 – Published 1 April 1976

Abstract

Using on-line mass separation ${}^{116}I$ has been identified and its half-life determined to be 2.91 ± 0.15 sec. The activity was produced by the ${}^{103}{Rh} ({}^{16}O, 3 n) {}^{116}I$ reaction and by the decay of 57-sec ${}^{116}{Xe}$ . The ${}^{116}I$ decays primarily to the ground state of ${}^{116}{Te}$ and also to excited states at 678.9 and 1219.1 keV. From positron measurements, a decay energy of $Q_{EC} = 7.71 \pm 0.20$ MeV is assigned to ${}^{116}I$ . $γ$ rays of 540.2 and 678.9 keV are observed in this decay and are assigned to depopulate levels in ${}^{116}{Te}$ at 1219.1 and 678.9 keV, respectively. The former is a new level with a probable spin-parity of either $2^{+}$ or $0^{+}$ . From the $log ft$ values, a spinparity assignment of $1^{+}$ is deduced for the ground state of ${}^{116}I$ , which is interpreted to have a configuration of [ $π (d_{\frac{5}{2}}) ν (d_{\frac{3}{2}})$ ]. A decay energy of $Q_{EC} = 4.34 \pm 0.20$ MeV observed from activity produced by the ${}^{104}{Pd}$ + ${}^{16}O$ reaction is assigned to ${}^{116}{Xe}$ .

NUCLEAR REACTIONS ${}^{103}{Rh} ({}^{16}O, 3 n γ)$ , $E = 83$ MeV; ${}^{104}{Pd} ({}^{16}O, 4 n γ)$ and ${}^{104}{Pd} ({}^{16}O, p 3 n γ)$ , $E = 91$ MeV. Natural Rh targets and enriched Pd targets. RADIOACTIVITY ${}^{116}I$ , ${}^{116}{Xe}$ ; measured $E_{γ}$ , $I_{γ}$ , $T_{\frac{1}{2}} (γ)$ , $T_{\frac{1}{2}} (β^{+})$ , $β^{+} - γ$ coin., $β^{+}$ end point; ${}^{116}{Te}$ deduced levels, $J$ , $π$ , $log ft$ ; ${}^{116}I$ deduced ground state $J$ , $π$ , $log ft$ ; Ge(Li) detectors and plastic scintillators; mass separated sources.

Received 8 September 1975

DOI:https://doi.org/10.1103/PhysRevC.13.1601

Authors & Affiliations

G. M. Gowdy, A. C. Xenoulis^*,‡, J. L. Wood, K. R. Baker^†,‡, and R. W. Fink^‡

School of Chemistry, Georgia Institute of Technology, Atlanta, Georgia 30332

J. L. Weil, B. D. Kern, and K. J. Hofstetter^‡,§

University of Kentucky, Lexington, Kentucky 40506

E. H. Spejewski^¶, R. L. Mlekodaj^¶, H. K. Carter^¶, and W. D. Schmidt-Ott^∥,¶

UNISOR, Oak Ridge, Tennessee 37830

J. Lin

Tennessee Technological University, Cookeville, Tennessee 38501

C. R. Bingham and L. L. Riedinger

University of Tennessee, Knoxville, Tennessee 37916

E. F. Zganjar

Louisiana State University, Baton Rouge, Louisiana 70803

K. S. R. Sastry

University of Massachusetts, Amherst, Massachusetts 01002

A. V. Ramayya^** and J. H. Hamilton^**

Vanderbilt University, Nashville, Tennessee 37235

^*Present address: Department of Physics, Demokritos Nuclear Research Center, Athens, Greece.
^†Present address: U. S. Energy Research and Development Administration, Division of Operational Safety, Mail Stop E-166, Washington, D. C. 20545.
^‡Work supported in part by the U. S. Energy Research and Development Administration.
^§Present address: Allied General Nuclear Services, Barnwell, South Carolina 29812.
^∥Present address: II. Physikalisches Institut der Universität Gättingen, Göttingen, Germany.
^¶UNISOR is a consortium of the University of Alabama at Birmingham, 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 them and by the U. S. Energy Research and Development Administration.
^**Work supported in part by a grant from the National Science Foundation.

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Vol. 13, Iss. 4 — April 1976

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