Level lifetimes and the nuclear structure of $^{134,136}$Xe from inelastic neutron scattering

ORAL

Abstract

The level structures of $^{134, 136}$Xe were studied with the inelastic neutron scattering reaction followed by $\gamma$-ray detection. Highly enriched solid XeF$_2$ samples were used in the measurements. A number of level lifetimes were determined for the first time with the Doppler-shift attenuation method, and the low-lying excited states were characterized from this new spectroscopic information. In $^{134}$Xe, the third excited state, a tentative $0^+$ level, was verified. The $3^-$ octupole phonon has been confirmed, and the complete negative-parity multiplet resulting from the $\nu (1h_{11/2}2d_{3/2})$ configuration has been tentatively identified for the first time in the $N = 80$ isotones. In $^{136}$Xe, a nucleus with a closed $N = 82$ neutron shell, several spins and parities of the states below 3 MeV in excitation energy have been firmly assigned for the first time, or have been re-assigned. New insights into the structures of these nuclei will be discussed.

*This material is based upon work supported by the U.S. National Science Foundation under Grant No. PHY-1606890.

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Authors

  • Erin Peters

    • Departments of Chemistry and Physics \& Astronomy, University of Kentucky, Lexington, KY 40506
    • University of Kentucky

  • A. Chakraborty

    • Departments of Chemistry and Physics \& Astronomy, University of Kentucky, Lexington, KY 40506

  • B.P. Crider

    • Departments of Chemistry and Physics \& Astronomy, University of Kentucky, Lexington, KY 40506

  • T.J. Ross

    • Departments of Chemistry and Physics \& Astronomy, University of Kentucky, Lexington, KY 40506

  • S.F. Ashley

    • Departments of Chemistry and Physics \& Astronomy, University of Kentucky, Lexington, KY 40506

  • E. Elhami

    • Departments of Chemistry and Physics \& Astronomy, University of Kentucky, Lexington, KY 40506

  • A. Kumar

    • Departments of Chemistry and Physics \& Astronomy, University of Kentucky, Lexington, KY 40506

  • S.H. Liu

    • Departments of Chemistry and Physics \& Astronomy, University of Kentucky, Lexington, KY 40506

  • M.T. McEllistrem

    • Departments of Chemistry and Physics \& Astronomy, University of Kentucky, Lexington, KY 40506

  • S. Mukhopadhyay

    • Departments of Chemistry and Physics \& Astronomy, University of Kentucky, Lexington, KY 40506

  • J.N. Orce

    • Departments of Chemistry and Physics \& Astronomy, University of Kentucky, Lexington, KY 40506

  • F.M. Prados-Est\'{e}vez

    • Departments of Chemistry and Physics \& Astronomy, University of Kentucky, Lexington, KY 40506

  • S. W. Yates

    • Departments of Chemistry and Physics \& Astronomy, University of Kentucky, Lexington, KY 40506
    • University of Kentucky

  • S.F. Hicks

    • Department of Physics, University of Dallas, Irving, TX 75062, USA