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.

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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*