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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

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Delayed neutron emission induced by 800 mev protons l.jpg

Delayed Neutron Emission Induced by 800 MeV Protons

Steven Greene, LANL

11/14/2007

Slide 1


Lanl research team l.jpg

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 configuration using prad l.jpg

Experimental Configuration - Using pRad


Experimental configuration prad facility l.jpg

Experimental Configuration - pRad Facility


Experimental setup ol station l.jpg

Experimental Setup - OL Station

Target ladder for small “bare” targets

Vacuum Beam Pipe

He3 detector and

LaBr detector

34-in target distance


Delayed neutrons from uranium over long times l.jpg

Delayed Neutrons from Uranium Over Long Times


Delayed neutrons from uranium at short times l.jpg

Delayed Neutrons from Uranium at Short Times


Delayed neutrons from pb w fe over long times l.jpg

Delayed Neutrons from PB, W, Fe Over Long Times


Delayed neutrons from pb w fe at short times l.jpg

Delayed Neutrons from PB, W, Fe at Short Times


Delayed neutrons from 18 o al cu over long times l.jpg

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


Delayed neutrons from 18 o al cu at short times l.jpg

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


Delayed neutrons on 10s of seconds time scale l.jpg

Delayed Neutrons on 10s of seconds time scale


Delayed neutrons on 10s of ms time scale l.jpg

Delayed Neutrons on 10s of ms time scale

Room return


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Delayed Gammas


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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 l.jpg

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 l.jpg

Shielding

  • 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


Shielding effects l.jpg

Shielding Effects


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