Experimental Exploration of $^{69}Br$ and the rp-Process $^{68}Se$ Waiting Point

ORAL

Abstract

To realistically model the rp-process, experimental data along the proton dripline are required. Of particular interest is the $^{68}Se$ waiting point region where proton capture is inhibited. The reaction rate for the 2p-capture process $^{68}Se + 2p\rightarrow^{70}Kr$ depends exponentially on the Q-value, which is poorly constrained. We have performed an experiment to measure Q-values of proton unbound states of nuclei, specifically $^{69}Br$, at the NSCL Coupled Cyclotron Facility. The experiment is designed to reconstruct the decays of proton unbound nuclei such as $^{69}Br$ by detecting the decay protons using the MSU High Resolution Array (HiRA) in coincidence with a heavy residue, e.g. $^{68}Se$, which is measured in the S800 spectrograph. Details of the experimental setup as well as preliminary experimental results will be presented.

*This work is supported by the National Science Foundation under Grant Nos. PHY-0606007 and PHY-9977707.

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Authors

  • A.M. Rogers

    • NSCL MSU

  • M. Famiano*

    • Physics Dept, WMU, Kalamazoo, MI, USA

  • M.S. Wallace

    • NSCL MSU

  • M.-J. van Goethem*

  • F. Delaunay*

  • W.G. Lynch

    • JINA, NSCL, and Dept. of Physics and Astronomy, MSU, East Lansing, MI 48824, USA
    • NSCL and Dept. of Physics and Astronomy, MSU, East Lansing, MI
    • NSCL, JINA, and Dept of Physics and Astronomy, Michigan State University, East Lansing, Michigan, 48824, USA
    • NSCL MSU

  • B. Tsang*

    • JINA, NSCL, and Dept. of Physics and Astronomy, MSU, East Lansing, MI 48824, USA
    • NSCL and Dept. of Physics and Astronomy, MSU, East Lansing, MI
    • NSCL, JINA, and Dept of Physics and Astronomy, Michigan State University, East Lansing, Michigan, 48824, USA

  • M. Mocko*

  • J. Lee*

    • NSCL, JINA, and Dept of Physics and Astronomy, Michigan State University, East Lansing, Michigan, 48824, USA

  • R. de Souza*

  • S. Hudan

  • L.G. Sobotka

    • Washington University in St. Louis

  • B. Charity*

    • Washington University
    • Department of Chemistry, Washington University

  • J. Elson*

  • S. Lobastov

  • D. Shapira

  • D. Bazin

  • A. Gade

  • G. Verde*