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In-Beam Electron Conversion from Yrast Levels of Se72,74,76,78, Kr78,80,82,84, Te114,116,118,120,122,124,126, and Ce130,132,134,136,138 Excited by (α,xn)

Walter G. Wyckoff* and James E. Draper

  • Crocker Nuclear Laboratory, University of California, Davis, California 95616

  • *Present address: Medical Radiation Physics, University of Washington, Seattle, Washington 98105.
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Phys. Rev. C 8, 796 – Published 1 August, 1973

DOI: https://doi.org/10.1103/PhysRevC.8.796

Abstract

A new in-beam electron spectrometer was used to measure electron conversion intensities of cascade transitions between yrast levels of the nuclei listed above. A few 2+′→2+ transitions were also measured. Altogether, 103 electron lines were measured during and between cyclotron bursts of 25-62-MeV α particles. The conversion coefficients, based on γ intensities from previous work at this laboratory, are compatible with the assignments of all but one of three transitions previously studied in this laboratory. The exception is the 1015-keV transition in Kr78, earlier obscured by a 1013-keV transition due to Al. These yrast level energies are correlated with a semi-empirical model. The complementary nature of measurements of in-beam angular distributions of γ rays and measurements of electron conversion coefficients is discussed.

[NUCLEAR REACTIONS Ge70(α,2n), E=27.5 MeV, Ge72(α,2n), E=27.5 MeV, Ge74(α,2n), E=27.5 MeV, Ge76(α,2n), E=27.5 MeV, Se76(α,2n), E=27.5 MeV, Se78(α,2n), E=25 MeV, Se80(α,2n), E=25 MeV, Se82(α,2n), E=25 MeV, Sn112(α,2n), E=33 MeV, Sn114(α,2n), E=27.5 MeV, Sn116(α,2n), E=33 MeV, Sn118(α,2n), E=27.5 MeV, Sn120(α,2n), E=27.5 MeV, Sn122(α,2n), E=27.5 MeV, Sn124(α,2n), E=25 MeV, Ba130(α,4n), E=62 MeV, Ba130(α,2n), E=33 MeV, Ba134(α,4n), E=62 MeV, Ba136(α,4n), E=62 MeV, Ba136(α,2n), E=27.5 MeV; measured in-beam ce intensities of transitions between yrast levels; from earlier γ intensities deduced ce coefficients to test level assignments; compared usefulness of angular distributions and ce coefficients; compared yrast level energies with EXP model.]

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Phys. Rev. C 8, 796– Published 1 August, 1973
  • Received 6 December 1972

© 1973 American Physical Society

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