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Delayed Neutron Emission Induced by 800 MeV Protons

Delayed Neutron Emission Induced by 800 MeV Protons. Steven Greene, LANL 11/14/2007. Slide 1. LANL Research Team. Chris Morris, P-25 ( Principal Investigator ) Steve Greene, P-25 Mark Makela, P-25 David Clark, P-22 Randy Spaulding, ISU Fesseha Mariam, P-25 Lori Waters, D-5

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Delayed Neutron Emission Induced by 800 MeV Protons

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  1. Delayed Neutron Emission Induced by 800 MeV Protons Steven Greene, LANL 11/14/2007 Slide 1

  2. LANL Research Team Chris Morris, P-25 (Principal Investigator) Steve Greene, P-25 Mark Makela, P-25 David Clark, P-22 Randy Spaulding, ISU Fesseha Mariam, P-25 Lori Waters, D-5 Jay Elson, D-5 Greg Canavan, P-DO Slide 2

  3. Experimental Configuration - Using pRad

  4. Experimental Configuration - pRad Facility

  5. Experimental Setup - OL Station Target ladder for small “bare” targets Vacuum Beam Pipe He3 detector and LaBr detector 34-in target distance

  6. Delayed Neutrons from Uranium Over Long Times

  7. Delayed Neutrons from Uranium at Short Times

  8. Delayed Neutrons from PB, W, Fe Over Long Times

  9. Delayed Neutrons from PB, W, Fe at Short Times

  10. Delayed Neutrons from 18O, Al, Cu Over Long Times

  11. Delayed Neutrons from 18O, Al, Cu at Short Times

  12. Delayed Neutrons on 10s of seconds time scale

  13. Delayed Neutrons on 10s of ms time scale Room return

  14. Delayed Gammas

  15. Delayed Cross Sections vs. Z • Delayed neutrons from Pb, Hg, Au appear to arise from fission. • 18O has the highest delayed neutron production of all targets measured. • Typical background materials like iron and Aluminum have cross sections ~1/100th of Uranium

  16. Experimental Setup - IL2 station Ladder DU: 1”x4”x4” Shielding Water, Al, Steel, Pb Various thicknesses Null Proton Beam centerline 22.50 Pb: 2”x4”x8” Quad He3 detector 315-cm target distance 310 He3 detector and LaBr detector 173-cm target distance 440

  17. Shielding • Material density thickness* • No shielding (air) 0.1 g/cm2 • Aluminum 27.4 g/cm2 4” • Steel 81 g/cm2 4” • Water 30.4 g/cm2 12” • Polyethylene (CH2) 29.5 g/cm2 12.5” • Sand (SiO2) 44.7 g/cm2 8” • Lead 229.6 g/cm2 8” *minimum linear thickness of materials --protons & neutrons traveled through materials at an angle of 22.50

  18. Shielding Effects

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