Meson-exchange enhancement of the first-forbidden Yg96(0)96Zrg (0+) β transition: β decay of the low-spin isomer of Y96

H. Mach, E. K. Warburton, R. L. Gill, R. F. Casten, J. A. Becker, B. A. Brown, and J. A. Winger
Phys. Rev. C 41, 226 – Published 1 January 1990
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Abstract

We have investigated the 0 Yg96 β decay to the levels of Zr96. A detailed decay scheme comprised of 63 γ rays and 44 energy levels has been obtained from γ singles, γ multispectral scaling, and γ-γ and E0-γ coincidences. Qβ was measured using the β-γ coincidence technique, while absolute E0 and γ-ray intensities were obtained from singles conversion electron and γ-ray spectra measured at beam saturation. The high sensitivity of the study was aimed at investigating the β feeding of levels with excitation enegy above 4 MeV. Although most of the new levels were found in this region, their total β feeding was found to be below 0.6%. The first-forbidden β-decay rate for 0 Yg960+ Zrg96 has been calculated within the framework of the spherical shell model using a model space of π(0f7/2,0f5/2,1p3/2,1p1/2,0g9/2) 1p1/2,0g9/2)ν (0g7/2,1d5/2,1d3/2,2s1/2) with limitations on the orbit occupancies. Additional evidence for meson enhancement of the timelike component of the axial current is obtained; the meson-exchange enhancement factor was found to be 1.75±0.30, where the uncertainty arises from the calculation.

  • Received 13 June 1989

DOI:https://doi.org/10.1103/PhysRevC.41.226

©1990 American Physical Society

Authors & Affiliations

H. Mach

  • Clark University, Worcester, Massachusetts 01610

E. K. Warburton

  • Universität Heidelberg and the Max-Planck-Institut für Kernphysik, Heidelberg, Federal Republic of Germany

R. L. Gill and R. F. Casten

  • Brookhaven National Laboratory, Upton, New York 11973

J. A. Becker

  • Lawrence Livermore National Laboratory, Livermore, California 94550

B. A. Brown

  • Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824

J. A. Winger

  • Ames Laboratory, Iowa State University, Ames, Iowa 50011

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Vol. 41, Iss. 1 — January 1990

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