Post on 19-Jan-2016
description
Thermal Neutron Scattering Cross Section Measurements of
Heavy Water
Thermal Neutron Scattering Cross Section Measurements of
Heavy Water
• G. Li (AECL)• G. Bentoumi (AECL)• L. Li (AECL)• B. Sur (AECL)• Z. Tun (NRC- CNBC)
UNRESTRICTED / ILLIMITÉ
2014 CAP Congress
Sudbury, Ontario
2014-06-19
Cross Section
/d d 2 /d d dE
Total cross section
Differential
Double Differential
UNRESTRICTED / ILLIMITÉ
3
Neutrons in the Reactor
3UNRESTRICTED / ILLIMITÉ
44
Super-Critical Water Reactor (SCWR)
up to 650 ℃
up to 350 ℃
SCWR
Picture courtesy of I. L. Pioro
UNRESTRICTED / ILLIMITÉ
AECL - OFFICIAL USE ONLY / À USAGE EXCLUSIF - EACL 5
Triple Axis Spectrometer
6
Triple Axis Spectrometer
2 sind
Picture courtesy of J. Root(CNBC)UNRESTRICTED / ILLIMITÉ
7
: Total Cross Section
exp( )NTransmission t
SampleDetector
Beam
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8
: Total Cross Section
Kropff 20C EXFOR 30283.002 BNL-325 EXFOR 11019.002 Rainwater EXFOR 11145.002 AECL 2013
IKE coherentIKE incoherent
o x +
- - - - -
AECL 2013
UNRESTRICTED / ILLIMITÉ
9
Normalization by Vanadium
Vanadiumtarget
sample Vanadium
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Normalization Equation
2 2
24
D O D OV V
D O V
d Cn
d n C
1 2
1 2
2( )
( )4 2
D E EV vD
D V E E
Cnd
d dE n C
Scattering Law Representation of2
1 2 2 2
1
( , )( , )
4DbDd E E E
e Sd dE kT E
2 /d d dE ( , )S
: momentum transfer equivalent; : energy transfer equivalent
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1111
2/ of D O, beam energy 41 meVd d
scattering angle(degree)0 20 40 60 80 100 120
(bar
n/sr
)
/dd
0
0.5
1
1.5
2
2.5
3
from Springer
AECL 2013
IKE coherent
AECL 2013
UNRESTRICTED / ILLIMITÉ
2( , ) of D O, with 27 meV energy transferS
0.2 0.4 0.6 0.8 1 1.2 1.4
) ,
S(
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16 AECL 2013, no corrections
Harling 1968
AECL 2013ENDFAECL 2013
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14
Summary
Achievements:
Reproduced the measurements of
Issues:
Multiple scattering
Plans:• Simulations using Geant4 and MCNP• Going to supercritical conditions
• • •
/d d
2 /d d dE
UNRESTRICTED / ILLIMITÉ