Non-yrast states in $^{221}$Th

ORAL

Abstract

The nucleus $^{221}$Th has been studied, using the $^{207}$Pb($^{18}$O,4n) E$_{lab}$=96 MeV fusion-evaporation reaction and the Gammasphere + HERCULES detector combination. The $^{18}$O beam, provided by the ATLAS accelerator, had a 247.5-ns pulse structure. Based on evaporation-residue selected $\gamma $--ray coincidence data, the previously reported [1] octupole band (yrast) has been extended to higher spin, but also the non-yrast structure of $^{221}$Th has been delineated. The latter includes another octupole-type band. A comparison with the neighboring nuclei $^{223}$Th and $^{219}$Ra will be presented. [1] M. Dahlinger et al., Nucl. Phys. A 484, 337 (1988).

*Supported by the US DOE (Grants DE-FG02-88ER-40406 and DE-A02-06CH11357)

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Authors

  • Walter Reviol

    • Washington University
    • Washington University at St. Louis

  • D.G. Sarantites

    • Washington University

  • C.J. Chiara

    • Washington University

  • O.L. Pechenaya

    • Washington University

  • J. Snyder

    • Washington University

  • K. Hauschild

    • CSNSM Orsay, France

  • A. Lopez-Martens

    • CSNSM Orsay, France

  • D.J. Hartley

    • US Naval Academy

  • M.P. Carpenter

    • Argonne National Lab.

  • Robert Janssens

    • Argonne National Lab.
    • Argonne National Laboratory

  • T. Lauritsen

    • Argonne National Lab.

  • D. Seweryniak

    • Argonne National Lab.

  • S. Zhu

    • Argonne National Lab.