New Isotopes: Er172 and Tm172

D. R. Nethaway, M. C. Michel, and W. E. Nervik
Phys. Rev. 103, 147 – Published 1 July 1956
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Abstract

Two new isotopes, Er172 of half-life 49.8±1 hr, and Tm172 of half-life 63.6±0.3 hr, have been found. The mass assignment of Tm172 was proven by direct mass separation, and that of Er172 by genetic relationship. The Tm172 isotope was found to emit a 1.5-Mev β particle, γ rays of 1.79, 1.44, 1.09, 0.40, 0.18, and 0.076 Mev, and a K x-ray of 0.049 Mev. The mass assignments of Er165, Er171, and Tm171 were verified.

  • Received 27 March 1956

DOI:https://doi.org/10.1103/PhysRev.103.147

©1956 American Physical Society

Authors & Affiliations

D. R. Nethaway and M. C. Michel

  • University of California Radiation Laboratory, Berkeley, California

W. E. Nervik

  • University of California Radiation Laboratory, Livermore, California

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Vol. 103, Iss. 1 — July 1956

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