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Nuclear Astrophysics

Carl R. Brune Ohio University, Athens Ohio. Nuclear Astrophysics. ARUNA Workshop , Notre Dame, IN. June 12-13, 2014. Edwards Accelerator Laboratory. Beam Swinger Neutron Time-of-Flight Facility at Ohio University. Target chamber. 4.5-MV T-shaped tandem. Swinger Magnet

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Nuclear Astrophysics

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  1. Carl R. Brune Ohio University, Athens Ohio Nuclear Astrophysics ARUNA Workshop, Notre Dame, IN June 12-13, 2014

  2. Edwards Accelerator Laboratory Beam Swinger Neutron Time-of-Flight Facilityat Ohio University Target chamber 4.5-MV T-shaped tandem Swinger Magnet (-4°  qlab  158°) Cs Sputter Source Duoplasmatron He Source 30-meter TOF Tunnel

  3. Neutron Time-of-Flight Technique 24Mg + 3He26Si(*) + n neutron flight path (≤30m) neutron detector Beam (3He) Target (24Mg) • time of flightneutron energy • kinematicsEx in 26Si • Dt ≈2 ns • long flight path, low En desirable • NE-213 scintillatorneutron / gamma discrimination Excellent energy resolution achievable (10 keV) !

  4. Neutron Energy Spectra (Y. Parpottas) full spectra 24Mg(3He,n)26Si(*) Key Result Mirror nucleus leads us to expect 3+ and 0+ in this region.

  5. 16O(3He,n)18Ne (Y. Parpottas) G(4.527) = 17(4) keV Neutron Energy (MeV)

  6. Charged-Particle or Gamma Coincidence • (Sergio Almarez-Calderon et al.) • Future need: more intense 3He/α sources • Specific cases: • - 19Ne via 19F(p,n) (for 18F+p) • - 42Ti via 40Ca(3He,n) for 41Ti(p,γ)42Ti Additional Considerations • Other Nuclear Astrophysics Projects: • Sub-coulomb transfer reactions • Statistical model studies

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