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CASPAR Underground Nuclear Astrophysics Laboratory current and future status

ORAL

Abstract

The closer accelerator-based experiments approach the burning regime of interest for stellar nucleosynthesis, the lower the reaction probability becomes. With this exponential drop off in cross-section the issue of background interference in signals becomes more problematic even with modern detection techniques. Aboveground experiments have background interactions from cosmic ray interference typically much greater than expected reaction signatures. To eliminate this cosmic interference the CASPAR accelerator laboratory is located a mile underground at the Sanford Underground Research Facility, studying nuclear reactions of astrophysical interest specifically (p,g), (a,g) and (a,n) reactions. The accelerator system has been in a 2-year hibernation and is currently ramping up phase to production mode. This talk will highlight recent measurements at CASPAR including s-process neutron sources, their production chains and neutron poisons, as well as the future timeline for new experimental campaigns.

Publication: Frentz et al., Phys. Rev. C 106 065803 (2022)<br>Shahina et al., Phys. Rev. C 106 025805 (2022)<br>Dombos et al., Phys. Rev. Lett. 128 162701 (2022)<br>Olivas-Gomez et al., Eur. Phys. Jour. A 58 57 (2022)

Presenters

  • Daniel Robertson

    University of Notre Dame

Authors

  • Daniel Robertson

    University of Notre Dame

  • Manoel Couder

    University of Notre Dame

  • Joachim Goerres

    University of Notre Dame

  • Anna Simon-Robertson

    University of Notre Dame

  • Frank Strieder

    South Dakota Sch Mines & Tech

  • Michael Wiescher

    University of Notre Dame