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Delayed Neutron Emission Induced by 800 MeV Protons

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Delayed Neutron Emission Induced by 800 MeV Protons

Steven Greene, LANL

11/14/2007

Slide 1

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

Target ladder for small “bare” targets

Vacuum Beam Pipe

He3 detector and

LaBr detector

34-in target distance

Room return

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

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

- Materialdensity thickness*
- No shielding (air) 0.1 g/cm2
- Aluminum 27.4 g/cm2 4”
- Steel 81 g/cm2 4”
- Water30.4 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