Energy Levels in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Sr</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>86</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> from the Decay of 14.6-h <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Y</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>86</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

A. V. Ramayya; B. Van Nooijen; J. W. Ford; D. Krmpotić; J. H. Hamilton; J. J. Pinajian; Noah R. Johnson

doi:10.1103/PhysRevC.2.2248

Energy Levels in ${}^{86}{Sr}$ from the Decay of 14.6-h ${}^{86}Y$

A. V. Ramayya, B. Van Nooijen, J. W. Ford, D. Krmpotić, J. H. Hamilton, J. J. Pinajian, and Noah R. Johnson

Phys. Rev. C 2, 2248 – Published 1 December 1970

Abstract

The radioactive decay of ${}^{86}Y$ has been investigated by performing internal- and external-conversion measurements with an iron-free double-focusing $β$ -ray spectrometer, $γ$ -ray measurements with Ge(Li) spectrometers, and $γ - γ$ coincidence experiments with NaI-NaI, NaI-Ge-(Li), and Ge(Li)-Ge(Li) coincidence arrangements coupled to two-parameter analyzers. Coincidence relationships were used extensively to aid in the construction of a level scheme for ${}^{86}{Sr}$ . Excited states are established at 1076.63, 1854.20, 2229.68, 2481.91, 2642.27, 2672.76, 2788.2, 2878.28, 2997.34, 3055.66, 3185.19, 3291.08, 3317.58, 3362.06, 3499.84, 3555.71, 3644.94, 3686.74, 3765.59, 3774.80, 3831.06, 3871.53, 3925.89, 3942.41, 3968.84, 4146.0, 4206.00, 4339, 4410.5, 4718, and 4954 keV. The $K$ conversion coefficient was directly measured for the 1076.63-keV transition and this transition was used to obtain $K$ conversion co-efficients from the relative $γ$ -ray intensities and the relative conversion-electron intensities. A new decay scheme is proposed which removes the inconsistencies of the older scheme and gives a much more detailed picture of the decay properties of the ${}^{86}Y$ nucleus.

Received 20 April 1970

DOI:https://doi.org/10.1103/PhysRevC.2.2248

Authors & Affiliations

A. V. Ramayya, B. Van Nooijen^*, J. W. Ford, D. Krmpotić^†, and J. H. Hamilton^‡

Physics Department, Vanderbilt University, Nashville, Tennessee 37203

J. J. Pinajian and Noah R. Johnson^§

Oak Ridge National Laboratory, Oak Ridge, Tennessee 37803

^*Present address: Technological University of Delft, Department of Physics, Delft, The Netherlands. Part of this work was performed while this author was on a National Science Foundation Senior Foreign Scientist Fellowship.
^†Present address: Boris Kidric Institute of Nuclear Science, Belgrade, Yugoslavia.
^‡Work supported in part by a grant from the National Science Foundation.
^§Research sponsored by the U. S. Atomic Energy Commission under contract with Union Carbide Corporation.

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Vol. 2, Iss. 6 — December 1970

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