Studying Fission Cross Sections near <sup>198</sup>Pb with AT-TPC at FRIB

ORAL

Abstract

In the region of the neutron deficient pre-actinides, around 198Pb and 180Hg, there is an unexpected island of asymmetric fission. To develop a method to determine fission barriers for rare isotopes and to study the transition between symmetric and asymmetric fission near 198Pb, rare isotopes were produced in the A1900 separator at the NSCL and fused with 4He target nuclei in the Active Target Time Projection Chamber (AT-TPC). In the experiment, the incident rare isotope beam particles were isotopically identified by the HEavy ISotope Tagger (HEIST), which allowed for the identification of the fissioning nucleus on an event by event basis. A combination of analytical and machine learning methods provided the identification of fission events. The stopping power of the beam particles in the helium gas has been measured by analyzing the Z and velocity of fission fragments at large folding angles. These experimental techniques and the energy dependence of isotopically resolved fusion fission cross-sections will be presented. Preliminary fission barriers extracted from the cross sections will also be presented.

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Presenters

  • Curtis Hunt

    • Michigan State University

Authors

  • Curtis Hunt

    • Michigan State University

  • Adam K Anthony

    • Michigan State University

  • Chenyang Niu

    • Michigan State University

  • Rensheng Wang

    • National Superconducting Cyclotron Labor

  • Joseph M Wieske

    • Michigan State University

  • Kyle W Brown

    • Michigan State University

  • Zbigniew Chajecki

    • Western Michigan University

  • William G Lynch

    • Michigan State University

  • Yassid Ayyad

    • Universidade de Santiago de Compostela

  • Jonathan E Barney

    • Michigan State University

  • Thomas Baumann

    • FRIB/NSCL
    • Facility for Rare Isotope Beams

  • Daniel Bazin

    • Michigan State University

  • Saul Beceiro-Novo

    • Michigan State University

  • Kaitlin J Cook

    • Michigan State University

  • Marco Cortesi

    • NSCL Cyclotron Lab

  • Thomas N Ginter

    • Michigan State University

  • Wolfgang Mittig

    • Facility for Rare Isotope Beams, Michigan State University, East Lansing, MI
    • Michigan State University

  • Andrew Pype

    • Michigan State University

  • Mallory K Smith

    • NSCL
    • Michigan State University

  • Chandana S Sumithrarachchi

    • Michigan State University
    • Facility for Rare Isotope Beams, Michigan State University, East Lansing, MI 48824, USA

  • Sean R Sweany

    • Michigan State University

  • Chi-En Teh

    • National Superconducting Cyclotron Laboratory, MSU
    • Facility for Rare Isotope Beams, MSU

  • Chun Yuen Y Tsang

    • Kent State University
    • FRIB

  • Betty Tsang

    • Michigan State University
    • FRIB

  • Nathan Watwood

    • Michigan State University

  • Alan H Wuosmaa

    • University of Connecticut

  • Jie Chen

    • Argonne National Laboratory

  • Justin Swaim

    • Western Michigan University

  • Cordero Soto

    • Western Michigan University

  • Jacob Boza

    • Western Michigan University