centro atomico bariloche - argentina. modeling and measurements of neutronic properties of new...
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CENTRO ATOMICO BARILOCHE - ARGENTINA
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MODELING AND MEASUREMENTS OF
NEUTRONIC PROPERTIES OF NEW CRYOGENIC
NEUTRON MODERATORS
CENTRO ATOMICO BARILOCHE - ARGENTINA
J.R. Granada, F. Cantargi, S. Petriw, J. DawidowskiCentro Atómico Bariloche
Comisión Nacional de Energía Atómica & CONICET
ARGENTINA
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CENTRO ATOMICO BARILOCHE - ARGENTINA
NyR - SOME RESEARCH ACTIVITIES
Total Cross Section Measurement and Calculation (subthermal to epithermal range) [+T]
Neutron Diffraction [+T]
Deep Inelastic Neutron Scattering [+T]
Non Destructive Hydrogen Content Determination
Scattering Kernels for Hydrogeneous Materials
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CENTRO ATOMICO BARILOCHE - ARGENTINA
Scattering Kernels for Hydrogeneous Materials
Previous Related Experience:
THE SYNTHETIC SCATTERING FUNCTION
[J.R. Granada, Phys.Rev. B 31, 4167 (1985)]
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0 20 40 60 80 100 120 1400
2
4
6
8
10
12
14
16
Multiple
Single
H2O
Cro
ss S
ectio
n (b
arn/
ster
ad)
Angle (degrees)
ANGULAR DISTRIBUTIONSExperiment performed at the Orphee reactor (λ=0.7045 Ả)
TOTAL CROSS SECTIONSLight water and plexiglass
at room temperature
1E-3 0.01 0.1 1 10
20
30
40
50
60708090
100
200
300
(%10)
PMMA
H2O
Tot
al C
ross
Sec
tion
(bar
n)
Energy (eV)
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0.00 0.02 0.04 0.06 0.08 0.100.0
5.0x103
1.0x104
1.5x104
2.0x104
D2O
SSF M.G. Silk J.W. Daughtry H.J. Jones F.R. Westfall N.G. Sjöstrand
Dec
ay C
onst
ant (
s-1)
Buckling (cm-2)
DIFFUSION PARAMETERSPulse decay time for a
traditional “Hokkaido configuration”
DIFFUSION PARAMETERSDecay constant of heavy water
at room temperature
0 2 4 6 8 100
50
100
150
200
250
300
TD = 124.8 s
Kiyanagi et al., NIM A312, 561 (1992)
(12x12x5)
H2 Decoupled
CH4 Decoupled
H2 Coupled
Dec
ay T
ime
(se
c)
Wavelength (Å)
J.Nucl.Mat. 139, 158 (1986)
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Multiple scattering corrections to the observed spectra
(MARI experiment)
Phys.Rev. B 58, 706 (1998)
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CENTRO ATOMICO BARILOCHE - ARGENTINA
1E-3 0.01 0.1 120
40
60
80
100
120
140160180200
CH4
GRANADA - CAB Nov. '94
Melkonian (293K) Rogalska (105K) SM (105K) NJOY (100k) SM (293K)
Cro
ss S
ect
ion
(b
arn
)
Energy (eV)
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1020
3040
1020
3040
50
1
10
100
1020
3040
1020
3040
50
1
10
100
NJOY/ENDF/B-VI.2NJOY/Synthetic Model
Inci
dent
Inci
dent
Final
Solid Methane - 20K
Final
SYNTHETIC SCATTERING KERNELSPhys.Rev. B 31, 4167 (1985)
CENTRO ATOMICO BARILOCHE - ARGENTINA
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1E-4 1E-3 0.01 0.1 1
100
150
200
250
300
350
(*) Grieger et al., J.Chem.Phys. 109,3161 (1998)
SOLID METHANE(ca 20K)
Exper.(*) NJOY NyR
4H-C
ross
Sec
tion
(b)
Energy (eV)
CENTRO ATOMICO BARILOCHE - ARGENTINA
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Cross sections calculated through ‘synthetic model’ compared with exp. data at different temperatures
Cryogenic Moderators
10-5 10-4 10-3 10-2 10-1 1000.1
1
10
100
p-H2
n-H2
SSF ENDF/B-VI Expt.
Tot
al C
ross
Sec
tion
(bar
n)
Energy (eV)
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CENTRO ATOMICO BARILOCHE - ARGENTINA
Development of New Cold Neutron Moderators
(Main objective of the ACoM collaboration)
SCATTERING KERNELS FOR ADVANCEDMODERATOR MATERIALS
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CENTRO ATOMICO BARILOCHE - ARGENTINA
NJOY Calculations
Synthetic Frequency Spectrum
Combination of experimental and synthetic contributions
Continuous part associated to traslational and rotational motions of the molecular system
Vibrational modes (discretes)
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NJOY
•(library ENDF)• scattering•mass•Scattering proc• SFS
Gaussian approx.
100 phonons
S(Q)[SFS]
LEAPR
S(Q)[SFS]
(E)kernels[SFS]
integrals libraryACE[SFS]
THERMR ACER
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Solid Methane: applications of the SFS concept
0.0001 0.001 0.01 0.1 1
100
1000
10000
100000
Espectro de neutrones(MCNP)Metano Sólido a 22K
[E
]
E [eV]
HB SFS (biblio MCNP)
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Solid Methane: using SFS
Neutron spectra at different temps calculated with MCNP Neutron spectra at different temps calculated with MCNP using SFS´based libraries.using SFS´based libraries.
0.001 0.01 0.1 1
100
1000
10000
100000
Espectro de neutrones (MCNP)Metano sólidoBibliotecas a partir del SFS
[E
]
E [eV]
22K 30K 50K 77K
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Light Water Ice
Cross Sections obtained from SFS
1x10-4 1x10-3 1x10-2 1x10-1 1x100
0.1
1
10
Inelástica
Hielo
Se
cció
n E
fica
z [b
arn
s]
E [eV]
115K 77K 50K 30K 20K
10-2 10-1 100
20
30
40
50
60
70
80
90
100
Hielo
Se
cció
n E
fica
z [b
arn
s]
E [eV]
Experimental 115K Total SFS 115K
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Clathrate
Neutron X-sections and spectra calculated with the use of a Synth. Frequency Spectrum
1x10-4 1x10-3 1x10-2 1x10-1 1x100
2.5
25
Clatrato (SFS)
Se
cció
n E
fica
z [b
arn
s]
E [eV]
Inelástica 20K Inelástica 30K Inelástica 50K Inelástica 77K
10-3 10-2 10-1
100
1000
10000
Espectro de neutrones (MCNP)Clatrato (SFS)
[E
]
E [eV]
20K 30K 50K 77K
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Clathrate
10-3 10-2 10-1 100
1000
10000
100000
Espectro de neutrones (MCNP)20K
[E
]
E [eV]
Clatrato Hielo Metano
Clathrate, Methane and Ice at 20K
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Cross sections calculated through ‘synthetic model’ compared with exp. data at different temperatures
Cryogenic Moderators
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Neutron spectra from moderator substances at different temperatures (calculated)
Cryogenic Moderators
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10-4 10-3 10-2 10-1 100 101
Neu
tron
flu
x [a
.u.]
E [eV]
Methane 22K Para-hydrogen 20 K Mesitylene 20 K
Calculated spectra of typical cryogenic moderators for the “Hokkaido Configuration”
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CENTRO ATOMICO BARILOCHE - ARGENTINA
SCATTERING KERNELS FOR ADVANCEDMODERATOR MATERIALS
Latest Development of New Cold Neutron Moderators
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CENTRO ATOMICO BARILOCHE - ARGENTINA
Neutron Scattering Kernel for Solid Methane in phase II
Rolando Granada
Centro Atomico Bariloche
ARGENTINA
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CENTRO ATOMICO BARILOCHE - ARGENTINA
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CENTRO ATOMICO BARILOCHE - ARGENTINA
The scattering law of a molecular system
R lν(t) denotes the position of the atom v within the molecule l , can be written as the sum of inter (l l´)- and intra (l l´)- molecular contributions (also referred to as the outer and inner terms, respectively).
The intermediate scattering function is
tiiaa
tiiaat
lvlvl
lvlvvv
vllvll
vllvvv
´´*
´,
´´´
´´*
´,
.exp0.exp
.exp0.exp,
RQRQ
RQRQQ
tiiaaedtS vllvll
vllvvv
ti´´
´,´´
*
´,
.exp0.exp2
1, RQRQQ
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CENTRO ATOMICO BARILOCHE - ARGENTINA
'
22
222intra
1
.3
,
HHHHH
iHc
HHHi
HcCC
Cc
fSS
bb
fbbgfbt
SS
Q
Carbon self Hydrogen self
Interference caused by Proton spin correlations
gГ = 1 for disordered molecules
= 3 for ordered molecules
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CENTRO ATOMICO BARILOCHE - ARGENTINA
1E-4 1E-3 0.01 0.1 1
100
200
300
400
To
tal C
ros
s S
ec
tio
n (
ba
rn)
E (eV)
Elast.self Elast. all Inelast. Total
4K
Calculated components of σT(E) for CH4 II at 4KCH4 II
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CENTRO ATOMICO BARILOCHE - ARGENTINA
1E-4 1E-3 0.01
200
400
600
800
To
tal C
ros
s S
ec
tio
n (
ba
rn)
E (eV)
0.3K
10K
Comparison of calculated σT(E) with experimental data of Grieger et al.
J.Chem.Phys.109,3161 (1998)
CH4 II
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CENTRO ATOMICO BARILOCHE - ARGENTINA
0.1 1 10
300
400
500
600
To
tal C
ros
s S
ec
tio
n (
ba
rn)
T (K)
1.5 meV
0.9 meV 0.1 meV
Temperature dependence of σT at low energies caused by spin correlations
Open circles: this workClosed circl.: Grieger exper.Lines: Ozaki calculations
CH4 II
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CENTRO ATOMICO BARILOCHE - ARGENTINA
1E-3 0.01 0.1 1
1E-6
1E-5
1E-4
Ne
utr
on
Flu
x (
au
)
E (eV)
Meth 22K Meth 4K
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CENTRO ATOMICO BARILOCHE - ARGENTINA
Neutron Cross Section Libraries for Aromatic Systems of interest as Cold Neutron Moderators
F. Cantargi, J.R. Granada, L.A. Rodríguez Palomino,S. Petriw, M.M. Sbaffoni
Centro Atomico Bariloche
ARGENTINA
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CENTRO ATOMICO BARILOCHE - ARGENTINA
• Good moderator for a cold neutron source good resistance to radiation (S.Kulikov, E. Shabalin, V. Melikhov, E. Kulagin, Proceedings of the ICANS-XVI Meeting, Neuss, Germany, 2003)
high protonic density low-energy excitations (I. Natkaniec, Proceedings of the ACoM6 Meeting, ESS-FZ Julich, 2002)
easy handling
MESITYLENE
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CENTRO ATOMICO BARILOCHE - ARGENTINA
0.00 0.02 0.04 0.06 0.08 0.100
2
4
6
8
10
12
Z(E
) (a
u))
E (eV)
Phase I Phase II Phase III
MESITYLENE
Low energy part of ouradopted SFS
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CENTRO ATOMICO BARILOCHE - ARGENTINA
1E-3 0.01 0.1 1200
400
600
800
1000
1200
To
tal
Cro
ss
Se
cti
on
(b
arn
s)
E (eV)
Experim. Calcul.
MESITYLENE32K
(Phase III)
Experiments using the Bariloche LINAC
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CENTRO ATOMICO BARILOCHE - ARGENTINA
1E-3 0.01 0.1 1200
400
600
800
1000
To
tal
Cro
ss
Se
cti
on
(b
arn
s)
E (eV)
Experim. Calcul.
MESI (3:2) TOL32 K
Experiments using the Bariloche LINAC
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CENTRO ATOMICO BARILOCHE - ARGENTINA
1E-3 0.01 0.11E-6
1E-5
Ne
utr
on
Flu
x
E (eV)
Benzene Toluene Mesityl ph II Mesityl ph III Mesi (3:2) Tol
20 K
Calculated Spectra for the Methyl derivatives of Benzene
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CENTRO ATOMICO BARILOCHE - ARGENTINA
1E-3 0.01 0.1 11E-7
1E-6
1E-5
1E-4
Neu
tro
n F
lux
E (eV)
Methane ph I Clathrate Mesitylene ph II Mesi (3:2) Tol Para hydrogen
20 K
Comparison of Mesitylene and Mixture with standard moderators
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CENTRO ATOMICO BARILOCHE - ARGENTINA
Thank you!
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CENTRO ATOMICO BARILOCHE - ARGENTINA
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25 MeV e-LINAC
LINAC
Bunker Experimental room
Scattering Experiments
Detector bank
Sample changer
P b n
n
e-
WATER
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25 MeV e-LINAC
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73 cm total height; 50 cm diameter; 38 cm moderator height. Stainless steel. Zircaloy-4 windows
Cryogenic Moderators
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Cryo-Moderator contained in succession of zircalloy-4 containers
Cryogenic Moderators
19,6cm20,2cm
5 cm
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CENTRO ATOMICO BARILOCHE - ARGENTINA
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CENTRO ATOMICO BARILOCHE - ARGENTINA