jasmin results and plans ○ shun sekimoto , h. yashima (kyoto university)
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JASMIN Results and Plans
○ Shun SEKIMOTO, H. YASHIMA (Kyoto University)H. MATSUMURA, A. TOYODA (KEK) K. OISHI,(Shimizu Corporation)
N. MATSUDA, Y. KASUGAI, Y. SAKAMOTO, H. NAKASHIMA (JAEA) D. BOEHNLEIN, G. LAUTEN, A. LEVELING, N. MOKHOV, K. VAZIRI (FNAL)
JASMIN (Japanese-American Study of Muon Interactions
and Neutron detection) Collaboration
JASMIN Results and Plans
JASMIN (Japanese-American Study of Muon Interactions
and Neutron detection) Collaboration
-Contents-1. Chemical Analysis of Gas at AP0 target station 2. Chemical Analysis of Cooling water from AP0 and NuMI3. Activation experiments in NuMI for muon-induced nuclear reactions
1. Chemical Analysis of Gas at AP0 target station # Collection of radioactive aerosols from the AP0 target vault using Impactor method
# Separation of radioactive aerosols into several samples according to particulate size ranging from 0.056 to 10 m
target room
Air gap
120 GeVproton
Inconel target
Concrete shielding
Iron shielding
Anti-proton target station
(AP0)→
Ave. beam current: 250-290 nA
To know particle size of those radioactive aerosols →For the radiation control purposes, especially for evaluating the internal exposure of the workers.
Target room120 GeVproton
target
Concrete shielding
Iron shielding
Impactor
Flow meter
Pump
Experimental (Aerosol-sampling) (3h sampling)
Gas/ aerosol-sampling device↓
Filter holder
Experimental (Aerosol-sampling)
Results: 14 nuclides→Be-7, Na-22, Na-24, Sc-46, Sc-47, V-48, Cr-51, Mn-54, Co-56, Co-57, Co-58, Co-60, Au-196, Au-198
# Separation of radioactive aerosols into several samples with different particle size
←Impactor10 stages for particles with 0.056 to 10 m diameter# Collected on Aluminum foil # 30 L of air /min of flow rate# 3 h-sampling (≈ 5.4 m3 of air in total) # gamma-ray spectrometry
10-7 10-6 10-50
1
2
3
4[103]
Particle diameter (dp, m)
(dA
0/dl
ndp)
7Be aerosol fitted
GMD 1.6μ m GSD 2.3
Be-7(T1/2: 53.3 d)
GMD: Geometric mean diameter
Results: Particle size distribution
10-1 100 101 102 10310-1
100
101Discussion: Half life vs. particle size distribution
Half-life (day)
GM
D (
μm
)
Na-24
Au-198Sc-47Au-196
V-48Cr-51Be-7Co-58Co-56Sc-46Co-57Mn-54Na-22Co-60
→From the correlation, growing up of aerosols in the accelerator target room could be discussed.
10-1 100 101 102 103
1
2
3Half life vs. particle size distribution (target room)
Half-life (day)
GM
D (
μm
)● Feb_2010○ Dec_2010
Na-24
Sc-44mAu-198Sc-47Mn-52Au-196
V-48Cr-51Be-7Co-58Co-56Sc-46Co-57Mn-54
0 20 40 60 80 100
0 20 40 60 80 100
NuMI Target
NuMI Horn1
NuMI Horn2
NuMI Decay pipe
NuMI Absorber
Pbar Collection lens
Pbar Pulse magnet
Pbar Dump
Colloid (>3 nm)Ion
Colloid formation for Be-7 in the cooling waters [%]
Dec2010
Sep2011Dec2010Feb2010
Sep2011Dec2010Feb2010
Sep2011Dec2010Feb2010
Sep2011Dec2010Feb2010
Sep2011Dec2010
Sep2011Dec2010
Sep2011Dec2010
Sep2011Dec2010
Study of colloid formation in cooling-waters(Experiments in Feb. 2010, Dec. 2010, and Sep. 2011)
Five Major IMPORTANT Results
Filter & Ion-exchange
Filter
Colloid
Ion
In case of Be-7 Equipped water purification system
(1) radiocolloid formation rates in the cooling waters are significantly high,(2) radiocolloid formation rate depends on the cooling water system,(3) remaining rate of Be-7 in the cooling-water depend on water purification system,(4) radiocolloid takes positive charge,(5) weak retention of colloid with cation-exchange resin was observed.Remaining rate in
cooling-water
0.002-0.05%
~5%
NuMI
Pbar
Study of muon-induced nuclear reactions at NuMIThree Major IMPORTANT Results(1) split muon beam came into the NuMI absorber hall,(2) nucleus excitation by muon is similar to by real photon (see Figs.1 and 2),(3) a reaction channel that have not been observed in bremsstrahlung-induced reaction was observed in muon-induced Au spallation (see Fig. 3).
0 5 10 15 20 25 30 35 40 450
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
Mass difference,
v [(
MeV
/nuc
l.)1/
2]
NuMI Absorber room, Cu-2 (at peak)
E0=600-1100 MeV, Haba et al.
400 GeV, Cole and Porile29 GeV, Porile and Tanaka28 GeV, Cumming et al.3 GeV, Crespo et al.810 MeV, Cumming et al.700 MeV, Crespo et al.600 MeV, Lagarde-Simonoff et al.150 MeV, Lagarde-Simonoff et al.
Muon
Bremsstrahlung
Proton
Cu target
10-1 100 101 10210-2
10-1
100
Kinetic energy (GeV)
Slop
e of
mas
s yi
eld
curv
e P
alcove-1
alcove-2photon
hadron
0 20 40 60 80 100 120 140 160 180 20010-38
10-37
10-36
10-35
10-34
10-33
10-32
10-31
Product mass number
Pro
du
ctio
n r
ate
s
Au target
alcove0-peak
alcove0-center
alcove1
alcove2
Cu target
Cu target
Deposit energy
into target nucleus
=
Velocity of nucleus
at 1st step of nuclear reaction
=
Mass yield distribution in Au target
Fig.2
Fig.1
Fig.3
a reaction channel that have not been observed in bremsstrahlung-induced
reaction
similar to by real photon
similar to by real photon
10-7 10-6 10-50
1
2
3
4[103](N
0/dl
ndp)
Particle diameter (dp, m)
24Na aerosol fitted
GMD 470nm, GSD 2.57
10-7 10-6 10-50
0.5
1
1.5
[104]
(N0/
dlnd
p)
Particle diameter (dp, m)
198Au aerosol fitted
GMD 1.22μ mGSD 1.80
10-7 10-6 10-50
100
200
300
400
(N0/
dlnd
p)
Particle diameter (dp, m)
47Sc aerosolfitted
GMD 1.15μ mGSD 1.84
[×104]
Na-2414.96 h
Au-1982.696 d
Sc-473.35 d
10-7 10-6 10-50
200
400
600
800
(N0/
dlnd
p)
Particle diameter (dp, m)
196Au aerosolfitted
GMD 1.16μ mGSD 1.80
Au-1966.183 d
(dA
0/d
lnd p
)
10-7 10-6 10-50
200
400
600(N
0/dl
ndp)
Particle diameter (d p, m)
48V aerosolfitted
GMD 2.19μ mGSD 2.16
10-7 10-6 10-50
200
400
600
(N0/
dlnd
p)
Particle diameter (dp, m)
51Cr aerosolfitted
GMD 2.02μ mGSD 2.01
V-4815.97 d
Cr-5127.7 d
(dA
0/d
lnd p
)
10-7 10-6 10-50
1
2[103]
(N0/
dlnd
p)
Particle diameter (dp, m)
56Co aerosol fitted
GMD 2.12μ mGSD 2.06
Co-5677.26 d
10-7 10-6 10-50
1
2
3
4
5[103]
(N0/
dlnd
p)
Particle diameter (dp, m)
58Co aerosol fitted
GMD 2.11μ mGSD 2.05
Co-5870.86 d
Particle diameter (dp, m)
10-7 10-6 10-50
200
400
600(N
0/dl
ndp)
Particle diameter (dp, m)
46Sc aerosolfitted
GMD 1.94μ mGSD 1.98
Sc-4683.82 d
(dA
0/d
lnd p
)
Particle diameter (dp, m)
10-7 10-6 10-50
1
2
3[103]
(N0/
dlnd
p)
Particle diameter (dp, m)
54Mn aerosol fitted
GMD 2.40μ mGSD 2.07
10-7 10-6 10-50
1
2
3[104]
(N0/
dlnd
p)
Particle diameter (dp, m)
57Co aerosol fitted
GMD 2.24umGSD 2.02
Co-57271.8 d
Mn-54312.2 d
10-7 10-6 10-50
100
200
(N0/
dlnd
p)
Particle diameter (dp, m)
22Na aerosol fitted
GMD 2.59 umGSD 2.12
Na-222.603 y
Restart of AP0-operation → サプリング : 2010.2月
Na-24Au-198Sc-47Au-196V-48Cr-51Be-7Co-58Co-56Sc-46Co-57Mn-54Na-22Co-60
Na-24Au-198Sc-47Au-196V-48Cr-51Be-7Co-58Co-56Sc-46Co-57Mn-54Na-22Co-60
Na-24Au-198Sc-47Au-196V-48Cr-51Be-7Co-58Co-56Sc-46Co-57Mn-54Na-22Co-60
Na-24Au-198Sc-47Au-196V-48Cr-51Be-7Co-58Co-56Sc-46Co-57Mn-54Na-22Co-60
Na-24Au-198Sc-47Au-196V-48Cr-51Be-7Co-58Co-56Sc-46Co-57Mn-54Na-22Co-60
Growing up of aerosols
Discussion: Half life vs. particle size distribution
Na-24Au-198Sc-47Au-196V-48Cr-51Be-7Co-58Co-56Sc-46Co-57Mn-54Na-22Co-60
Na-24Au-198Sc-47Au-196V-48Cr-51Be-7Co-58Co-56Sc-46Co-57Mn-54Na-22Co-60
Na-24Au-198Sc-47Au-196V-48Cr-51Be-7Co-58Co-56Sc-46Co-57Mn-54Na-22Co-60
Na-24Au-198Sc-47Au-196V-48Cr-51Be-7Co-58Co-56Sc-46Co-57Mn-54Na-22Co-60
Na-24Au-198Sc-47Au-196V-48Cr-51Be-7Co-58Co-56Sc-46Co-57Mn-54Na-22Co-60
Growing up of aerosols
Discussion: Half life vs. particle size distributionRestart of AP0-operation →6 month→ Aerosol-sampling
10-7 10-6 10-50
100
200(N
0/dl
ndp)
Particle diameter (dp, m)
60Co aerosol fitted
GMD 2.55 umGSD 2.09
Co-605.272 y
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