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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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Neutron activation of materials relevant for gerda

Institut für Kern- und Teilchenphysik

Neutron activation of materials relevant for GERDA

GERDA-meeting - Padova

Alexander Domula

March 12th 2009



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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