measurement and simulation of radionuclide product yields in iron from 400 amev carbon ions
DESCRIPTION
Measurement and simulation of radionuclide product yields in iron from 400 AMeV carbon ions. T.Ogawa, M.Morev, Takeshi Iimoto, Toshiso Kosako The university of Tokyo. SATIF-10, 2-4 June 2010, CERN. In-Target γ-emitting fragments. 400 MeV C ion. Abstract. Experiment - PowerPoint PPT PresentationTRANSCRIPT
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Measurement and simulation of radionuclide product yields in iron from 400 AMeV carbon ions
T.Ogawa, M.Morev,
Takeshi Iimoto, Toshiso Kosako
The university of Tokyo
SATIF-10, 2-4 June 2010, CERN
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Abstract• Target fragment in Fe target• Bombarded by 400MeV/u C ion• Experiment and calculation with FLUKA
• FLUKA– Projectile fragment, deep fragmentation
: Underestimation (50%)– Isomer : Reasonable– Others : Good agreement
400 MeV C ion
In-Target γ-emitting fragments
Experiment Simulation (FLUKA)
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Background• Activation in intermediate ~high energy
– Problem in decommissioning
• Monte-Carlo calculation codes– Ejectile yield ← Good measurements– Target fragment ← Few benchmark data
Essential in activation estimation
SATIF-10, 2-4 June 2010, CERN
Particle Ejectile
t
Bed
Targetfragment
24Na,43K, 54Mn
5
Experiment
• Irradiation (~10 h, Cooling)
• Gamma spectrometry
SATIF-10, 2-4 June 2010, CERN
16 cm
16 cm
6.85 cm
Fe
4.0 cm
0.15 cm
C (400MeV/u)
Collimated beam
HPGeDisassemblageCooling (avoid pile-up)
Measure activity one by one
☆Only decay γ-emmiting☆detectable intensity☆Medium ~ Long half-livednuclides were measured
Be-7, Na-22, Na-24, Mg-28, K-42, K-43, Sc-44m, Sc-46, Sc-47, Sc-48, V-48, Cr-48, Cr-51, Mn-52, Mn-54, Co-55, Co-56, Co-58
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Simulation• Fe: Natural isotope composition
• Impurities (C, P, Mn, S, Si) ←Minor effect
• RQMD (A-A interaction) model
SATIF-10, 2-4 June 2010, CERN
~~FLUKA-2008~~
16 cm
16 cm
6.85 cm
Fe
4.0 cm
0.15 cm
C (400MeV/u)
Collimated beam
On-line calculation(RESNUCLE option)
11.35h exposure1h cooling
Bq/mm
Depth
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Results ~~Lighter than projectile~~
0 10 20 30 40 50 60
Depth in iron target, m m
1E+002
1E+003
1E+004
200
300
500
2000
3000
5000
Line
al a
ctiv
ity Al,
Bq/
mm
Be-7Experim entFLUKA
• Projectile fragments– Underestimated (~50%)
• Production in range– Underestimated
– Direct or indirect
+ Projectile fragments+ Secondary particle induced
Direct reaction X-sec orSecondary induced reactionunderestimated
SATIF-10, 2-4 June 2010, CERN
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Results ~~ Deep fragmentation~~
• X-section underestimated– Secondary particle induced : underestimated
• End of range: Underestimation
0 10 20 30 40 50 60
Depth in iron target, m m
1E+003
1E+004
1E+005
2000
3000
5000
20000
30000
50000
Lin
ea
l act
ivity
Al,
Bq
/mm
Na-24Experim entFLUKA
SATIF-10, 2-4 June 2010, CERN
0 10 20 30 40 50 60
Depth in iron target, m m
1E+000
1E+001
1E+002
2
3
5
20
30
50
Line
al a
ctiv
ity Al,
Bq/
mm
Na-22Experim entFLUKA
X-sec underestimated by 50%
RQMD model limitation100 MeV/u
Range ~5.1cm
Secondary particle induced reaction
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Results ~~ Isomer~~
• Isomer production – 1/2 ground, 1/2 meta-stable assumption : Not critical
SATIF-10, 2-4 June 2010, CERN
0 10 20 30 40 50 60
Depth in iron target, m m
1E+003
1E+004
1E+005
2000
3000
5000
20000
30000
50000
Line
al a
ctiv
ity Al,
Bq/
mm
Sc-44mExperim entFLU KA(R Q M D )
0 10 20 30 40 50 60
Depth in iron target, m m
1E+002
1E+003
1E+004
200
300
500
2000
3000
5000
Lin
ea
l act
ivity
Al,
Bq
/mm
Sc-46Experim entFLU KA(R Q M D )
・ Close atomic numbers・ Similar underestimation
Results ~~ Isomer-2~~
• Isomer production – Mn-52 g
• Very good agreement
0 10 20 30 40 50 60
Depth in iron target, m m
1E+003
1E+004
1E+005
2000
3000
5000
20000
30000
50000
Line
al a
ctiv
ity Al,
Bq/
mm
M n-52Experim entFLUKA(R Q M D )
5.591 d
21.1 m
8.275
54.9 s
8.275 h
Detectable gamma
0.5
0.5
SATIF-10, 2-4 June 2010, CERN
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Results ~~As heavy as target~~
• Severely underestimated (~1/300)
• Low E light ion (α, t, etc) induced reactions?
SATIF-10, 2-4 June 2010, CERN
0 10 20 30 40 50 60
Depth in iron target, m m
1E-001
1E+000
1E+001
1E+002
1E+003
23
5
2030
50
200300
500
Line
al a
ctiv
ity Al,
Bq/
mm
Co-58Experim entFLUKA(R Q M D )
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Results ~~other nuclides~~ • Higher contribution from secondary particles
0 10 20 30 40 50 60
Depth in iron target, m m
1E+003
1E+004
1E+005
2000
3000
5000
20000
30000
50000
Lin
eal a
ctiv
ity Al,
Bq
/mm
V -48Experim entFLU KA
0 10 20 30 40 50 60
Depth in iron target, m m
1E+003
1E+004
1E+005
2000
3000
5000
20000
30000
50000
Lin
eal a
ctiv
ity Al,
Bq
/mm
Co-55Experim entFLU KA
RQMD model limitation100 MeV/u
SATIF-10, 2-4 June 2010, CERN
Secondary particle induced
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Conclusion• Fe target + 400MeV/u C ion
• Experiment & Simulation
• Overall good agreement– Projectile fragment : Under? (50%)– Deep fragmentation : Under (50%)– Shallow fragmentation
by secondary particles : Good agreement– Isomer assumption : Reasonable– Others : Good agreement
SATIF-10, 2-4 June 2010, CERN
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Acknowledgement
• We gratefully acknowledge the support and assistance of the accelerator operation staff at HIMAC and Dr. Murakami.
• We wish to thank the FLUKA authors Dr. Francesco Cerutti, Dr. Vasilis Vlachoudis and Dr. Alfredo Ferrari for fruitful discussions