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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 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

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  1. Institut für Kern- und Teilchenphysik Neutron activation of materials relevant for GERDA GERDA-meeting - Padova Alexander Domula March 12th 2009

  2. Neutron Introduction/Activation Experiments • Neutron-Activations with 14MeV Neutrons • Activation of copper and stainless steel components

  3. 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

  4. 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

  5. Neutron Activation Experiments inelastic scattering 74Ge(n,n‘)74Ge* Neutron capture 74Ge(n, g)75mGe

  6. Neutron Activation Experiments fast Neutron activation 59Co(n,p)59Fe 65Cu(n,2n)64Cu  63Cu(n,a)60Co 76Ge(n,p)76Ga

  7. Neutron Activation Experiments competing reaction channels • one product of different isotopes • one product of different reaction channels

  8. Neutron Activation Experiments • spectroscopy of Neutron fields • dosimetry • measurement of Neutron-reaction cross-sections • exploring nuclear level schemes • material analysis

  9. 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

  10. 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

  11. 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

  12. Activation of stainless steel components (Fe) • long living nuclides • Feb 27th 2009, 11:42:13tL = 256‘979s

  13. Activation of stainless steel components • two ways to get 54Mn • 56Fe(n,2np)54Mn • 54Fe(n,p)54Mn not mentioned 14 MeV Neutrons!

  14. cross section vs. Neutron Flux   • activation 2,6 times higer for 56Fe(n,2np)54Mn reaction  54Fe(n,p)54Mn also important

  15. Activation of stainless steel components (Mo) • long living nuclides tL = 165‘840 s

  16. Activation of stainless steel components (Ni) • short living nuclides tL = 1‘750 s

  17. Activation of stainless steel components (Ti) • long living nuclides tL = 170‘465 s

  18. Activation of Copper • end irradiation Feb 12th 2009, 16:00 • short living nuclides • Feb 12th 2009, 17:07:24, tL = 1‘239 s

  19. Activation of Copper • long living nuclides • Mar 2nd 2009, 12:03:33tL = 169‘995 s

  20. cobalt in copper ?

  21. Cross sections 59Co(n,x) • 59Co(n,2n)58Co only when 59Co(n,a)56Mn is visible

  22. Activation of Cobalt • short living nuclides • tL = 265 s

  23. 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

  24. 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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