neutron activation of materials relevant for gerda institut für kern- und teilchenphysik march 12th...
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![Page 1: Neutron activation of materials relevant for GERDA Institut für Kern- und Teilchenphysik March 12th 2009 GERDA-meeting - Padova Alexander Domula](https://reader031.vdocuments.net/reader031/viewer/2022032723/56649d185503460f949eda59/html5/thumbnails/1.jpg)
Neutron activation of materials relevant for GERDA
Institut für Kern- und Teilchenphysik
March 12th 2009
GERDA-meeting - Padova
Alexander Domula
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① Neutron Introduction/Activation Experiments
② Neutron-Activations with 14MeV Neutrons
③ Activation of copper and stainless steel components
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Neutron Activation Experiments
Neutron sources:
• radioactive sources- radioactive -sources (210Po, 241Am,…)- 7Li(,n)10B, 9Be(,n)12C, 13C(,n)16O,…- 241Am-9Be source En
midd = 4,46 MeV
• nuclear fission- Maxwell- or Wattspectra; E(
max) ≈ 1 MeV
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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 (,n)-reactions
• cosmic ray reactions
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Neutron Activation Experiments
'* n n XX AZ
AZ
inelastic scattering
74Ge(n,n‘)74Ge*
Neutron capture
74Ge(n,)75mGe
XX AZ
AZ
1 n
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Neutron Activation Experiments
xBA n
fast Neutron activation
63Cu(n,)60Co
76Ge(n,p)76Ga
59Co(n,p)59Fe
65Cu(n,2n)64Cu
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Neutron Activation Experiments
competing reaction channels• one product of different isotopes• one product of different reaction channels
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Neutron Activation Experiments
• spectroscopy of Neutron fields
• dosimetry
• measurement of Neutron-reaction cross-sections
• exploring nuclear level schemes
• material analysis
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Activation Experiments at 14 MeVTUD Neutron Generator
motivation:
• GERDA meeting at Nov 2008
„Cosmogenic Radionuclides in stainless steel and copper“
G.Heusser, M. Laubenstein1. stainless steel2. copper
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Activation Experiments at 14 MeVTUD Neutron Generator
• chemical composition of 1.4571 stainless steel (X6CrNiMoTi17-12-2)
Element C Si Mn P S Cr MoMo NiNi TiTi
Max. fraction %
0,08 1,00 2,000,04
50,01
5 18,5 2,52,5 13,513,5 0,70,7
++ rest consists of FeFe
• activation experiments at neutron facility at FZD Rossendorf- stainless steel components (1.4571):
Fe, Mo, Ni, Ti activated elementwise
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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
E [keV] Nuclid
846,8 56-Mn
1811,38 56-Mn
2114,04 56-Mn
2524,18 56-Mn
3371,28 56-Mn
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Activation of stainless steel components (Fe)• long living nuclides
- Feb 27th 2009, 11:42:13tL = 256‘979 s
E [keV] Nuclid
121,38 57-Co
319,79 51-Cr
510,99 Annihilation
810,76 58-Co
834,9 54-Mn
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Activation of stainless steel components• two ways to get 54Mn
56Fe(n,2np)54Mn 54Fe(n,p)54Mn not mentioned
14 MeV Neutrons!
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cross section vs. Neutron Flux
1,12max
),(
max
)2,( pnFe
npnFe
nat
nat
22,0)MeV10(
)MeV40(
E
E
• activation 2,6 times higer for 56Fe(n,2np)54Mn reaction
54Fe(n,p)54Mn also important
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Activation of stainless steel components (Mo)
E [keV] Nuclid
140,02 99-Mo / 99m-Tc
180,5 99-Mo
235,49 95m-Nb
765,76 95-Nb
777,93 96-Nb
934,54 92-Nb
1199,89 96Nb
1204,88 91m-Nb
1477,38 93m-Mo
• long living nuclides tL = 165‘840 s
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Activation of stainless steel components (Ni)• short living nuclides
tL = 1‘750 s
E [keV] Nuclid
121,21 57-Co
136,88 57-Co
127,75 57-Ni
510,8 Annihilation
810,58 58-Co
847,15 56-Co ?
1377,84 57-Ni
1758,27 57-Ni
1920,5 57-Ni
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Activation of stainless steel components (Ti)
E [keV] Nuclid
158,72 47-Sc
174,77 48-Sc
510,94 46-Sc
888,99 48-Sc
983,33 48-Sc
1037,35 46-Sc
1120,49 47-Sc
1212,82 48-Sc
1312,12 48-Sc
• long living nuclides tL = 170‘465 s
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Activation of Copper
E [keV] Nuclid
366,14 65-Ni
510,86 Annihilation
1115,7 65-Ni
1346,18 64-Cu
1482,18 65-Ni
• end irradiation Feb 12th 2009, 16:00• short living nuclides
- Feb 12th 2009, 17:07:24, tL = 1‘239 s
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Activation of Copper• long living nuclides
- Mar 2nd 2009, 12:03:33tL = 169‘995 s
E [keV] Nuclid
121,02 57-Co
135,03 57-Co
510,76 Annihilation
608,50 214-Bi
809,73 58-Co
1171,96 60-Co
1331,05 60-Co
1460,30 40-K
1763,63 214-Bi
2504,83 60-Co
2613,64 208-Tl
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cobalt in copper ?
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Cross sections 59Co(n,x)• 59Co(n,2n)58Co only when 59Co(n,)56Mn is
visible
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Activation of Cobalt• short living nuclides
- tL = 265 sE [keV] Nuclid
510,92 Annihilation
810,72 58-Co
846,76 56-Mn
1099,28 59-Fe
1291,85 59-Fe
1811,31 56-Mn
2113,97 56-Mn
2524,09 56-Mn
3373,84 56-Mn
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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
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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 ?