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Institut für Kern- und Teilchenphysik. Neutron activation of materials relevant for GERDA. GERDA-meeting - Padova. Alexander Domula. March 12th 2009. Neutron Introduction/Activation Experiments Neutron-Activations with 14MeV Neutrons Activation of copper and stainless steel components.

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slide2
Neutron Introduction/Activation Experiments
  • Neutron-Activations with 14MeV Neutrons
  • Activation of copper and stainless steel components
neutron activation experiments
Neutron Activation Experiments

Neutron sources:

  • radioactive sources
    • radioactive a-sources (210Po, 241Am,…)
    • 7Li(a,n)10B, 9Be(a,n)12C, 13C(a,n)16O,…
    • 241Am-9Be source Enmidd = 4,46 MeV
  • nuclear fission
    • Maxwell- or Wattspectra; E(jEmax) ≈ 1 MeV
neutron activation experiments1
Neutron Activation Experiments
  • accelerators
    • charged particle reactions
      • 7Li(p,n)10B (Q=-1,646 MeV)
      • 2H(d,n)3He (Q=3,266 MeV)
      • 3H(d,n)4He (Q=17,586 MeV; En≈14,064 MeV)
    • Bremsstrahlung  (g,n)-reactions
  • cosmic ray reactions
neutron activation experiments2
Neutron Activation Experiments

inelastic scattering

74Ge(n,n‘)74Ge*

Neutron capture

74Ge(n, g)75mGe

neutron activation experiments3
Neutron Activation Experiments

fast Neutron activation

59Co(n,p)59Fe

65Cu(n,2n)64Cu

 63Cu(n,a)60Co

76Ge(n,p)76Ga

neutron activation experiments4
Neutron Activation Experiments

competing reaction channels

  • one product of different isotopes
  • one product of different reaction channels
neutron activation experiments5
Neutron Activation Experiments
  • spectroscopy of Neutron fields
  • dosimetry
  • measurement of Neutron-reaction cross-sections
  • exploring nuclear level schemes
  • material analysis
activation experiments at 14 mev tud neutron generator
Activation Experiments at 14 MeVTUD Neutron Generator
  • motivation:
  • GERDA meeting at Nov 2008
  • „Cosmogenic Radionuclides in stainless steel and copper“
  • G.Heusser, M. Laubenstein
    • stainless steel
    • copper
activation experiments at 14 mev tud neutron generator1
Activation Experiments at 14 MeVTUD Neutron Generator
  • chemical composition of 1.4571 stainless steel(X6CrNiMoTi17-12-2)
  • activation experiments at neutron facility at FZD Rossendorf
    • stainless steel components (1.4571):
      • Fe, Mo, Ni, Ti activated elementwise
activation of stainless steel components fe
Activation of stainless steel components (Fe)
  • end irradiation Feb 12th 2009, 16:00
  • short living nuclides
    • Feb 12th 2009, 17:33:15, tL = 580 s
activation of stainless steel components fe1
Activation of stainless steel components (Fe)
  • long living nuclides
    • Feb 27th 2009, 11:42:13tL = 256‘979s
activation of stainless steel components
Activation of stainless steel components
  • two ways to get 54Mn
    • 56Fe(n,2np)54Mn
    • 54Fe(n,p)54Mn not mentioned 14 MeV Neutrons!
cross section vs neutron flux
cross section vs. Neutron Flux

  • activation 2,6 times higer for 56Fe(n,2np)54Mn reaction

 54Fe(n,p)54Mn also important

activation of stainless steel components mo
Activation of stainless steel components (Mo)
  • long living nuclides tL = 165‘840 s
activation of stainless steel components ni
Activation of stainless steel components (Ni)
  • short living nuclides tL = 1‘750 s
activation of stainless steel components ti
Activation of stainless steel components (Ti)
  • long living nuclides tL = 170‘465 s
activation of copper
Activation of Copper
  • end irradiation Feb 12th 2009, 16:00
  • short living nuclides
    • Feb 12th 2009, 17:07:24, tL = 1‘239 s
activation of copper1
Activation of Copper
  • long living nuclides
    • Mar 2nd 2009, 12:03:33tL = 169‘995 s
cross sections 59 co n x
Cross sections 59Co(n,x)
  • 59Co(n,2n)58Co only when 59Co(n,a)56Mn is visible
activation of cobalt
Activation of Cobalt
  • short living nuclides
    • tL = 265 s
summary
Summary
  • Neutron activation is a powerful tool to investigate radioisotope production
  • First samples of Fe, Ni, Mo, Ti, Cu and Co have been activated with 14 MeV Neutrons
  • 54Fe(n,p)54Mn reaction can‘t be neglected for 54Mn production on iron
  • Observed 57Co by copper activation due to nickel within Cu
next steps
Next steps
  • activation of 1.4571 stainless steel sample provided by G. Heusser
  • work towards cross section measurement
  • activation of chrome ?
  • Activation of Argon ?
  • Activation of any other Material of interest for GERDA ?
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