Search for α-decay of high spin isomers in rare earth nuclei

J. A. Vrba, C. R. Bingham, M. W. Guidry, R. E. Neese, E. E. Gross, T. P. Cleary, D. C. Hensley, and E. V. Hungerford
Phys. Rev. C 22, 755 – Published 1 August 1980
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Abstract

Using a decay-in-flight technique, a search for 1-100 nsec α decay has been conducted in a variety of rare earth nuclei made in energetic heavy ion reaction. Assuming spherical rigid rotation and α particle formation factors similar to those of the ground state, this lifetime range corresponds to nuclear spins of 3050 where very high spin isomerism has been predicted theoretically. No evidence for α decay was observed. α decay cross section limits are set for 14 systems in which high spin isomers (I>10 ) are known with lifetimes in the range studied. Comparison to theoretical total cross sections allows α-branching ratio estimates to be made.

RADIOACTIVITY Short-lived isomers of Gd, Tb, Dy, Ho, Er; measured limits on Iα for 6<Eα<16 MeV and 1<t12<100 nsec; deduced limits on α-decay branching ratios.

  • Received 5 February 1980

DOI:https://doi.org/10.1103/PhysRevC.22.755

©1980 American Physical Society

Authors & Affiliations

J. A. Vrba, C. R. Bingham, M. W. Guidry, and R. E. Neese

  • The Universitv of Tennessee, Knoxville, Tennessee 37916 and Oak Ridge National Laboratorv, Oak Ridge, Tennessee 37830

E. E. Gross, T. P. Cleary, and D. C. Hensley

  • Oak Ridge National Laboratorv, Oak Ridge, Tennessee 37830

E. V. Hungerford

  • The Universitv of Houston, Houston, Texas 77004

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Issue

Vol. 22, Iss. 2 — August 1980

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