GRETINA as a Compton Polarimeter

ORAL

Abstract

The ability to measure both the spin and parity of an excited state in an oriented nucleus through its emitted gamma radiation can provide information on the multipolarity, mixing ratio, and parity of the transition. GRETINA has been characterized as a Compton-polarimeter with interaction positions from tracking by examining gamma-rays emitted in the 24Mg(p,p') reaction at 2.45 and 6 MeV[1]. In this work, we consider GRETINA as a traditional Compton-polarimeter, where the intensity of the scattered radiation measured between physical detecting elements (segment and crystal boundaries) is used to determine its polarization sensitivity. The 36-fold crystals of GRETINA along with the arrays compact geometry allows many elements to act as both scatterer and detector across the array. This provides a direct comparison of the arrays ability to measure the linear polarization to measurements made over the past decades. The performance of GRETINA as a traditional Compton-polarimeter will be presented.

[1] A. Wiens et al: BAPS2014.HAW.DK.2, to be published.

*This material is based upon work supported by the U.S. Department of Energy, Office of Science and Office of Nuclear Physics under contracts number DE-AC02-05CH11231(LBNL) and number DE-AC02-06CH11357(ANL).

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Presenters

  • Peter C C Bender

    • Univ of Mass - Lowell
    • Michigan State Univ
    • UMass Lowell

Authors

  • Peter C C Bender

    • Univ of Mass - Lowell
    • Michigan State Univ
    • UMass Lowell

  • Dirk W W Weisshaar

    • Michigan State Univ
    • National Superconducting Cyclotron Laboratory, Michigan State University

  • Alexandra Gade

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • Michigan State Univ
    • Michigan State University

  • Andreas Wiens

    • Lawrence Berkeley Natl Lab

  • Augusto O Macchiavelli

    • Lawrence Berkeley Natl Lab

  • Christopher M Campbell

    • Lawrence Berkeley Natl Lab

  • Roderick M Clark

    • Lawrence Berkeley Natl Lab

  • Heather Crawford

    • Nuclear Science Division, Lawrence Berkeley National Laboratory
    • Lawrence Berkeley Natl Lab
    • Lawrence Berkeley Natl Lab, Argonne Natl Lab, Los Alamos Natl Lab, University of Connecticut, iThemba LABS, University of Maryland
    • Lawrence Berkeley National Laboratory

  • Mario Cromaz

    • Lawrence Berkeley Natl Lab

  • Paul Fallon

    • Lawrence Berkeley Natl Lab

  • I-Yang Lee

    • Lawrence Berkeley Natl Lab

  • S.L. L. Tabor

    • Florida State Univ
    • Florida State University

  • Vandana Tripathi

    • Florida State University

  • Akaa D Ayangeakaa

    • US Naval Academy

  • Michael P P Carpenter

    • Argonne Natl Lab
    • Argonne National Laboratory
    • ANL

  • Helena David

    • Argonne Natl Lab

  • Robert V F Janssens

    • Univ of NC - Chapel Hill

  • Torben Lauritsen

    • Argonne Natl Lab

  • Shaofei Zhu

    • Argonne National Laboratory
    • Argonne Natl Lab

  • Partha Chowdhury

    • Univ of Mass - Lowell
    • Univ. of Mass - Lowell

  • Christopher J J Lister

    • Univ of Mass - Lowell
    • UMass Lowell