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First results from LACES-X-Array-SATURN: Isomeric State Half-Life in <sup>156</sup>Pm

ORAL

Abstract

A new conversion electron detector has been commissioned at the ATLAS/CARIBU facility at

Argonne National Laboratory. The LSU-Argonne Conversion Electron Spectrometer (LACES) is

a LN2-cooled Si(Li) detector system designed to be coupled to the X-Array/Scintillator and Tape

Using Radioactive Nuclei (SATURN) decay station. The beta-decay of 156Nd has been employed

to populate states in the deformed, odd-odd nucleus 156Pm. Within the experiment, the half-

life of the low-spin Kπ = 1+ isomeric state at 150.3 keV has been determined. The initial results,

including internal conversion coefficients and transition multipolary assignments, will be presented.

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Publication: [1] "The LSU-Argonne Conversion Electron Spectrometer: A new detector for the<br>X-Array and SATURN decay station", S. Lopez-Caceres, S. T. Marley, M. P. Carpenter, G. Savard, F. G. Kondev, P. Copp, G. E. Morgan, D. Seweryniak, and J. A. Clark, In preparation for submission to Nuclear Instruments and Methods in Physics Research Section A, (2023)<br><br>[2] "Decay Spectroscopy with 156,156mPm and 156Sm", S. Lopez-Caceres, S. T. Marley, M. P. Carpenter, G. Savard, F. G. Kondev, P. Copp, G. E. Morgan, D. Seweryniak, and J. A. Clark, In preparation for submission to Physical Review Letters, (2023)<br>

Presenters

  • Sergio Lopez-Caceres

    Louisiana State University

Authors

  • Sergio Lopez-Caceres

    Louisiana State University

  • Scott T Marley

    Louisiana State University

  • Michael P Carpenter

    Argonne National Laboratory

  • Guy Savard

    Argonne National Laboratory

  • Filip G Kondev

    Argonne National Laboratory

  • Patrick A Copp

    Argonne National Laboratory

  • Graeme Morgan

    Louisiana State University

  • Dariusz Seweryniak

    Argonne National Laboratory

  • Jason A Clark

    Argonne National Laboratory

  • Walter Reviol

    ANL

  • Claus Muller-Gatermann

    ANL

  • Kay Kolos

    LLNL

  • Daniel E Hoff

    Lawrence Livermore National Laboratory

  • Andrew M Rogers

    University of Massachusetts Lowell

  • Sanjanee W Waniganeththi

    University of Massachusetts Lowell

  • Alan J Mitchell

    Australian National University

  • Soumen Nandi

    Argonne National Laboratory, ANL

  • Heshani Jayatissa

    Argonne National Laboratory, Los Alamos National Laboratory

  • David He

    Louisiana State University

  • Gemma L Wilson

    Louisiana State University