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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

Delayed Neutron Emission Induced by 800 MeV Protons

Steven Greene, LANL

11/14/2007

Slide 1

lanl research team
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

experimental setup ol station
Experimental Setup - OL Station

Target ladder for small “bare” targets

Vacuum Beam Pipe

He3 detector and

LaBr detector

34-in target distance

slide15
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
experimental setup il2 station
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

shielding
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

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