Observation of Tm149 decay to Er149 levels and β-delayed proton emission

K. S. Toth, J. Gilat, J. M. Nitschke, P. A. Wilmarth, K. Vierinen, and F. T. Avignone III
Phys. Rev. C 36, 826 – Published 1 August 1987
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Abstract

With the use of an on-line isotope separator, Tm149 (T1/2=0.9±0.2 s) was identified in Ni58 bombardments of Mo94. Seven γ rays were observed to follow the isotope’s (β++electron capture) decay, including the 111.3-keV transition known from Erm149 isomeric decay to be the d3/2 (111.3 keV)→s1/2 (0.0 keV) γ ray in Er149. In addition to the previously known levels at 111.3 (d3/2) and 741.5 (h11/2) keV in Er149, our data establish three other excited states, at 907.4 ((5/2+), 1066.2 ((7/2), and 1482.9 ((9/2, (11/2) keV. Coincidences observed between Er K x rays and protons in the A=149 mass chain show that Tm149 is a β-delayed proton precursor.

  • Received 23 March 1987

DOI:https://doi.org/10.1103/PhysRevC.36.826

©1987 American Physical Society

Authors & Affiliations

K. S. Toth

  • Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

J. Gilat, J. M. Nitschke, P. A. Wilmarth, and K. Vierinen

  • Lawrence Berkeley Laboratory, Berkeley, California 94720

F. T. Avignone III

  • University of South Carolina, Columbia, South Carolina 29208

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Vol. 36, Iss. 2 — August 1987

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