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Study of Neutron-rich Nuclides of Z $=$ 13, 12

POSTER

Abstract

Neutron-rich nuclides show features not observed in stable nuclides indicating changes in nuclear structure. Certain regions of the chart of nuclides are of particular interest such as the ``islands of inversion.'' An experiment to produce nuclides in highly excited states was performed at the National Superconducting Cyclotron Laboratory. A $^{\mathrm{48}}$Ca beam collided with a beryllium production target, which produced multiple secondary beams such as $^{\mathrm{34}}$Al and $^{\mathrm{36}}$Si. These beam nuclides impinged on a segmented target consisting of alternating Si-PIN detectors (4 total) and beryllium targets (3 total) producing many nuclides in highly excited states that resulted in a charged fragment and one or more neutrons being emitted. Using a superconducting dipole magnet, the charged fragments were swept into several charged particle detectors while the neutrons were measured as they interacted with arrays of scintillating plastic bars called the MoNA-LISA. The fragments and the emitted neutrons are detected in coincidence and their detected properties may be pieced together by invariant mass analysis to determine the energy of the neutron-unbound nuclide prior to decay. The results of the analysis for neutron detection, isotope separation, and the energy reconstruction of the decayed nuclides will be presented.

Authors

  • John McDonaugh

    Augustana College

  • Nathan Frank

    Augustana College

  • Robbie Seaton-Todd

    Davidson College

  • Anthony Kuchera

    Davidson College, Davidson

  • Paul Gueye

    MSU/NSCL

  • Paul DeYoung

    Hope College