Radiations from the Active Isotopes of Ytterbium

J. M. Cork, M. K. Brice, D. W. Martin, L. C. Schmid, and R. G. Helmer
Phys. Rev. 101, 1042 – Published 1 February 1956
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Abstract

By using Yb of high purity (99.8%) irradiated in the maximum flux of the Argonne pile and studied by scintillation and magnetic photographic spectrometers, a reevaluation of the energies of the radiations has been made. Several previously unreported gamma rays are found and nuclear level schemes for Tm169, Lu175, and Lu177 are proposed. Several of the levels appear to be rotational states in the unified nuclear model. Yb169 decays with a half-life of 30.6 days by K capture, followed by eleven gamma rays in Tm169. Rotational levels lie at 8.4, 118.3, and 139.1 kev. The gamma energies are 8.4, 20.6, 63.2, 93.6, 109.9, 118.3, 130.7, 177.7, 198.6, 261.0, and 308.3 kev. Yb175 decays with a half-life of 4.2 days by β emission (471 kev max) followed by five gamma rays in Lu175. Rotational levels exist at 114.1, and 251.9 kev. The gamma energies are 114.1, 137.8, 145.0, 282.9, and 397.0 kev. Yb177 decays with a half-life of 1.88 hour by β emission followed by gamma transitions in Lu177. In addition to any lower energy gamma rays, two high-energy transitions are found at 1.080 and 1.228 Mev. The latter is a cross over for the 1.080- and 0.148-Mev gammas which are in coincidence. The expected well-known daughter product Lu177, if present at all, is too weak to be observed by the magnetic spectrometers.

  • Received 15 August 1955

DOI:https://doi.org/10.1103/PhysRev.101.1042

©1956 American Physical Society

Authors & Affiliations

J. M. Cork, M. K. Brice, D. W. Martin, L. C. Schmid, and R. G. Helmer

  • University of Michigan, Ann Arbor, Michigan

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Issue

Vol. 101, Iss. 3 — February 1956

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