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CASPAR An underground Accelerator Laboratory for Nuclear Astrophysics

CASPAR An underground Accelerator Laboratory for Nuclear Astrophysics. Manoel Couder University of Notre Dame. Neutron sources for the s-process CASPAR Facility Collaboration Timeline. s-process nucleosynthesis. Two components were identified and connected to stellar sites:.

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CASPAR An underground Accelerator Laboratory for Nuclear Astrophysics

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  1. CASPARAn underground AcceleratorLaboratory for Nuclear Astrophysics Manoel Couder University of Notre Dame

  2. Neutron sources for the s-process • CASPAR • Facility • Collaboration • Timeline ARUNA 2014

  3. s-process nucleosynthesis Two components were identified and connected to stellar sites: Main s-process ~90<A<210 Weak s-process A<~90 TP-AGB stars 1-3 M⊙ massive stars > 8 M⊙ core He-burning shell C-burning 3-3.5·108 K ~1·109 K kT=25 keVkT=90 keV 106 cm-3 1011-1012 cm-3 22Ne(a,n)25Mg shell H-burning He-flash 0.9·108 K 3-3.5·108 K kT=8 keVkT=25 keV 107-108 cm-3 1010-1011 cm-3 13C(a,n)16O 22Ne(a,n)25Mg ARUNA 2014

  4. 22Ne(a,n)25Mg Status of direct measurements 22Ne(α,n)25Mg 22Ne(α,n)25Mg ARUNA 2014

  5. HIgS 26Mg(, ) 26Mg(g,n) Longlandet al. 2009 5) 4) 3) 2) 1) ER = 11153.5(1) keV, Jπ = 1+ cannot contribute to the n-channel ARUNA 2014

  6. (a,a’) and (6Li,d) at RCNP Osaka 22Ne(6Li,d) 26Mg(α,α’) ARUNA 2014

  7. Status 13C(α,n) Contribution from below threshold at -3 keV has been evaluated withTrojan Horse Method.M. La Cognata et al. Since the present technical possibilities appear to be exhausted, a reduction of the remaining uncertainty can probably only be achieved in an underground laboratory, where the cosmic-ray induced γ background can be avoided. M. Heil et al., Phys. Rev. C 78, 025803 (2008) ARUNA 2014

  8. CASPAR Compact Accelerator System to Perform Astrophysics Research At the Sanford Underground Research Facility (USA/SD) ARUNA 2014

  9. CASPAR Proton and Helium beam from a 200 kV to 1MV electrostatic accelerator Bombard an extended 22Ne gas target surroundedby 3He neutron detector Complementary to LUNAresearch program Different energy range Helium beam allowed ARUNA 2014

  10. CASPAR 10-3 to 10-4 neutron background of surface Low internal background 3He tube • S. Falahat et al., NIMA 700 (2013) 53 ARUNA 2014

  11. CASPAR Aggressive time line: Installation completed by mid-2015 Will be operational before any newunderground accelerator program inthe world Collaboration between: University of Notre Dame South Dakota School of Mines and Technology Colorado School of Mines JN 1MV accelerator (H and He beams) Refurbishment and control system Neutron detector Technical support Gas target for isotopically enriched gas Construct the laboratory Partially fund the installation of CASPAR Local supportIn charge of operation ARUNA 2014

  12. CASPAR Science goals Neutron Sources and Neutron Poisons 13C(α,n)16O, 22Ne(α,n)25Mg, 22Ne(α,γ)26Mg, 17O(α,n)20Ne, 17O(α,γ)21Ne Total program: (5-8 years) Preliminary measurement at Notre Dame and elsewhere to optimize underground studies • Other science goals • Other nuclear astrophysics questions • Reaction of interest for fusion energy and plasma physics ARUNA 2014

  13. Collaborations • CASPAR • SDSM&T: D. Wells + ??? • CSM: U. Greife • UND: H.-S. Jung , D. Robertson, K. Setoodehnia, M. Wiescher • Friends @ UNC A. Champagne ARUNA 2014

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