235-u prompt fission neutron spectra - nuclear energy … · 235-u prompt fission neutron spectra...
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V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
1
235-U PROMPT FISSION NEUTRON SPECTRA
V.M. Maslov Joint Institute for Nuclear and Energy Research,
220109, Minsk-Sosny, Belarus
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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Collaboration
235U(n,F) prompt fission neutron spectra’COLLABORATION
V.M. Maslov1) , V.P.Pronyaev2), N.A. Tetereva1),A.B. Kagalenko2),R.Capote3),T. Granier4), Hambsch5), B. Morillon4), P. Romain4), F.-J., J.-C. Sublet6)
1) Joint Institute of Nuclear and Energy Research, 220109,Minsk-Sosny, Belarus2) Institute of Physics and Power Engineering, 249033, Obninsk, Russia
3) International Atomic Energy Agency, Vienna, Austria4) CEA, Centre DAM-Ile de France, 91927,Arpajon, Cedex, France
5) EU-JRC Institute for Reference Materials and Measurements, Geel, Belgium6) CEA, Cadarache, 13108,Saint Paul lez Durance, France
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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SCOPE
Problem of Prompt fission neutron spectra Thermal regionFast region Emissive fissionCritical assemblies benchmarking
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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WPEC, vol.9, Fission Neutron Spectra of Uranium-235, NEA, OECD, 2003
Possible sources of thermal PFNS problem1. Discrepant experiments by Starostov et al. (1985) and Wang Yufeng et al.
(1989).2. Integral activation cross sections in thermal PFNS3. Differential activation cross sections 4. LANL(Madland-Nix (1981) Model) One more source:Spectrum in integral measurements is not a thermal PFNS, applied corrections do not workMajor problem’ sourcePoor description of differential PFNS data in data libraries
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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After vol.9 :
Various recipes, like1. S(En,ε)=1/2(S(En,ε,LF)+ S(En,ε,HF))
modified asS(En,ε)= vL/(vL + vH)S(En,ε,LF)+ vH /(vL + vH) S(En,ε,HF)
Nishio et al. 1998S(En,ε)= 0.58 S(En,ε,LF)+ 0.42 S(En,ε,HF)
2. Energy dependence of the CN formation for FF3. SL,S1,S2… fission modes, etc.
do not help.
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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ε, MeV0,1 1 10
R(E
th, ε
), <E
n>=1
.964
MeV
0,6
0,7
0,8
0,9
1,0
1,1
preENDF/B-VIILANL, 2003, ν(A), Nishio et al., 1998 ENDF/B-VII=ENDF/B-VI.8Kornilov et al., 1999Starostov et al., 1985
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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ε, MeV1 2 3 4 5 6 7 8 9 10 11 12
R(E
th, ε
), <E
n>=1
.964
MeV
0,6
0,7
0,8
0,9
1,0
1,1
preENDF/B-VIILANL, 2003, ν(A), Nishio et al., 1998 ENDF/B-VII=ENDF/B-VI.8Kornilov et al., 1999Starostov et al., 1985
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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WPEC, vol.9, Fission Neutron Spectra of Uranium-235, NEA, OECD, 2003
After vol.9 :235U(n,F) Average energies of PFNS for 0.4< En <200 MeVby Ethvignot et al., Phys. Rev. Let. Vol. 94, 052701, 2005
238U(n,F) Average energies of PFNS for 1.7 <En <200 MeVby Ethvignot et al., Phys. Lett. B575, 221, 2003Prompt fission neutron spectra (PFNS) 238U(n,F), 232Th(n,F) at En < 20 MeV,
Maslov et al. Phys. Rev. C69, 034607, 2003235U(n,F), Maslov et al., Nucl. Phys., A760, 274, 2005235U(n,F) thermal PFNS measurement, Hambsch et al., 2009,
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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NEUTRON ENERGY, MeV
0 2 4 6 8 10 12 14 16 18 20
<E>,
MeV
1.9
2.0
2.1
2.2
2.3
2.4
2.5Smirenkin et al, 1994Boykov et al., 1994Ethvignot et al., 2005
ENDF/B-VIJENDL-3.3BROND-2Maslov et al., 2005
Kornilov et al., 1998
ENDF/B-VIIBertin et al., 1978
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Prompt fission neutron spectra model
Post-scission neutrons from LF&HF(pre-acceleration NE + NE from accelerated fragments) approximated as a sum of two Watt’ (LF+HF) distributions.Kornilov, Kagalenko, Hambsch (1999)Major parameters: 1) ratio of the TLF/THF =1-1.252)Ekin of FF at the moment of NE, 0.8-0.95 * Ekin at infinity
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S(ε,En) - sum of two Watt distributions:
∑=
=2
1n )),(,,(5.0)E,S(
inijni ETEW αεε
ε
εε
παε
i
i
i
vi
inijni b
bshTE
TETEW
)()exp(2)),(,,(
*
2/3 −=
iiriii
vii UTKEEkT
TE
b −−== ,4 *
iT -temperature for light and heavyfragments, α =TKE/TKE∝
In Watt' equation CMS energy per nucleon -
vivi EE α=*
-
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VENUS –3 I.Kodeli, A. Trkov, R.Capote, Y. Nagaya, V.Maslov, 2009
PFNS for 235U(nth,f)215In(n,n’)58Ni(n,p)27Al(n,α)
2-6 MeV PFNS energy range
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
13235_U(nth, f), PFNS, ~50 keV shift in <E>235U FISSION NEUTRON SPECTRUM En~Eth
NEUTRON ENERGY, MeV0,01 0,1 1 10
R(E
n,ε)
0,4
0,6
0,8
1,0
Kornilov et al., 1999Starostov et al., 1984
JENDL-3.3 ENDF/B-VII.0present
preENDF/B-VII
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
14235_U(nth, f), PFNS, ~50 keV shift in <E>
235U FISSION NEUTRON SPECTRUM En~Eth
NEUTRON ENERGY, MeV10
R(E
n,ε)
0,6
0,8
1,0
Kornilov et al., 1999Starostov et al., 1984
JENDL-3.3 ENDF/B-VII.0present
preENDF/B-VII
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235_U(n,f) PFNS by Starostov et al. (1985) data –relative to 252Cf(sf), made with 3 detectors for 3 overlapping emitted
neutron energies1. Levelled
2. Smoothed with 7th order polinomial3. Normalized using Manhart (2007) 252Cf(sf) data
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ε, MeV2 4 6 8 10 12
R(E
th, ε
), <E
n>=1
.964
MeV
0,6
0,7
0,8
0,9
1,0
1,1
B.I. Starostov et al., YK, 3, p. 16 (1985),renormalized preENDF/B-VIILANL, 2003, ν(A), Nishio et al., 1998 ENDF/B-VII=ENDF/B-VI.8
PRESENT
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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ε, MeV0,1 1 10
R(E
th, ε
), <E
n>=1
.964
MeV
0,6
0,7
0,8
0,9
1,0
1,1
B.I. Starostov et al., YK, 3, p. 16 (1985),renormalized preENDF/B-VIILANL, 2003, ν(A), Nishio et al., 1998 ENDF/B-VII=ENDF/B-VI.8
PRESENT
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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235U(nth,f) fission neutron spectrum
Neutron energy, MeV2 4 6 8 10 12
R(E
n,ε)
0,6
0,7
0,8
0,9
1,0
1,1
presentHambsch et al., 2009
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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235U(nth,f) neutron spectra for therm. neutrons
Neutron energy, MeV0,1 1 10
R(E
n,ε)
0,6
0,7
0,8
0,9
1,0
1,1
Starostov et al., 1985, updatedpresentKornilov et al. (1999)preENDF/B-VIIHambsch et al., 2009ENDF/B-VII.0
1
1
2
2
3
3
4
4
5
5
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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235U(nth,f) neutron spectra for therm. neutrons
Neutron energy, MeV2 4 6 8 10 12
R(E
n,ε)
0,6
0,7
0,8
0,9
1,0
1,1
Starostov et al., 1985, updatedpresentKornilov et al. (1999)preENDF/B-VIIHambsch et al., 2009ENDF/B-VII.0
3
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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ε, MeV2 4 6 8 10 12
R(E
th, ε
), <E
n>=1
.964
MeV
0,6
0,7
0,8
0,9
1,0
1,1
B.I. Starostov et al., YK, 3, p. 16 (1985),renormalized preENDF/B-VIILANL, 2003, ν(A), Nishio et al., 1998 ENDF/B-VII=ENDF/B-VI.8
PRESENTHambsch et al., 2009
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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ε, MeV0,1 1 10
R(E
th, ε
), <E
n>=1
.964
MeV
0,6
0,7
0,8
0,9
1,0
1,1
B.I. Starostov et al., YK, 3, p. 16 (1985),renormalized preENDF/B-VIILANL, 2003, ν(A), Nishio et al., 1998 ENDF/B-VII=ENDF/B-VI.8
PRESENTHambsch et al., 2009
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235U FISSION NEUTRON SPECTRUM En~Eth
NEUTRON ENERGY, MeV0,01 0,1 1 10
R(E
n,ε)
0,6
0,8
1,0
1,2
Kornilov et al.,1999Wang Yufeng et al., 1989
ENDF/B-VII.0JENDL-3.3 preENDF/B-VIIpresent
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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235U FISSION NEUTRON SPECTRUM En~Eth
NEUTRON ENERGY, MeV10
R(E
n,ε)
0,6
0,8
1,0
1,2
Kornilov et al.,1999Wang Yufeng et al., 1989
ENDF/B-VII.0JENDL-3.3 preENDF/B-VIIpresent
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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235U FISSION NEUTRON SPECTRUM En~Eth
NEUTRON ENERGY, MeV0,1 1 10
R(E
n,ε)
0,6
0,8
1,0
1,2
Kornilov et al., 1999Lajtai et al., 1985
JENDL-3.3 ENDF/B-VII.0present
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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235U FISSION NEUTRON SPECTRUM En~0.5MeV
NEUTRON ENERGY, MeV0,01 0,1 1 10
R(E
n,ε)
0,6
0,8
1,0
1,2
Kornilov et al., 2009Johanson et al., 1977
JENDL-3.3ENDF/B-VII.0present
235U FISSION NEUTRON SPECTRUM En~0.5MeV
NEUTRON ENERGY, MeV2 4 6 8 10 12 14
R(E
n,ε)
0,6
0,8
1,0
1,2
Kornilov et al., 2009Johanson et al., 1977
JENDL-3.3ENDF/B-VII.0present
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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235U FISSION NEUTRON SPECTRUM En~0.5MeV
NEUTRON ENERGY, MeV0 2 4 6 8 10 12 14 16
R(E
n,ε)
0,6
0,8
1,0
1,2
1,4Kornilov et al., 1999Staples et al., 1995
JENDL-3.3ENDF/B-VII.0present
235U FISSION NEUTRON SPECTRUM En~0.5MeV
NEUTRON ENERGY, MeV0 2 4 6 8 10
R(E
n,ε)
0,6
0,8
1,0
1,2
1,4
Kornilov et al.,1999Trufanov et al., 1994
JENDL-3.3ENDF/B-7present
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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235U FISSION NEUTRON SPECTRUM En~1.5MeV
NEUTRON ENERGY, MeV0 10
R(E
n,ε)
0,6
0,8
1,0
1,2
1,4 Kornilov et al.,1999Staples et al., 1995
JENDL-3.3ENDF/B-VII.0present
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235U FISSION NEUTRON SPECTRUM En~2.9MeV
NEUTRON ENERGY, MeV0 2 4 6 8 10 12
R(E
n,ε)
0,6
0,8
1,0
1,2
Kornilov et al., 1999Boykov et al., 1991
JENDL-3.3 ENDF/B-VII.0present
235U FISSION NEUTRON SPECTRUM En~5MeV
NEUTRON ENERGY, MeV0 2 4 6 8 10 12 14
R(E
n,ε)
0,6
0,8
1,0
1,2
Kornilov et al., 1999Lovchikova et al.,2000
JENDL-3.3ENDF/B-VII.0present
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
30235U FISSION NEUTRON SPECTRUM En~5MeV
NEUTRON ENERGY, MeV0 2 4 6 8 10 12 14
R(E
n,ε)
0.6
0.8
1.0
1.2
PresentLovchikova et al.,2000
JENDL-3.3preENDF/B-VII
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Multiple-chance fission – pre-saddle (pre-fission) plus post-scission (post-fission) neutrons (pre-acceleration NE + NE from accelerated fragments)
Consistent analysis of (n,f) and competing (n,xn) reactions Prompt fission neutron spectra (PFNS) of 235U(n,f), 238U(n,f), 232Th(n,f) at En
< 20 MeV Exclusive pre-fission (pre-saddle) (n,xnf) reaction neutron spectra+ multiple-
chance fission cross section structure PFNS for actinides for En <20 MeV
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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Prompt-fission neutron spectra SA+2-x (ε,En) - sum of two Watt distributions:
superposition of exclusive pre-fission (n,xnf) spectra and post-fission spectra SA+2-x (ε,En)
( )
( ) ( )
( ) ( ) ( ))) )(()E,(S)()(
) )(()E,(S)()(
)()E,(S)()(
)E,(S)()()(()E,S(
3n3nnf
2n3nnf
1n3nnf
2n2nnf
1n2nnf
1nnnf
4n244
3n133
2n22
n1A111
n
εσ
εσ
εσ
εσ
εσ
εσ
βεβν
βεβν
βεβν
εβννε
dEd
dEd
dEd
nAnn
dEd
dEd
nAnn
dEd
nAnn
nnn
nnn
nn
n
EEE
EEE
EEE
EEE
+++
+++
++
+=
−
−
+−
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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235U(n,F) & 235U(n,2n)
neutron energy, MeV0 10 20
0
1
2
3Poenitz, 1977Leugers et al., 1976 Lisowski et al., 1991
Present, (n,F)Present, (n,f)Present, (n,nf)Present, (n,2nf)JEFF-3.1,(n,F)JEFF-3.1,(n,f)JEFF-3.1,(n,nf)JEFF-3.1,(n,2nf)ENDF/B-VII.0
neutron energy, MeV5 10 15 20
(n,2
n) c
ross
sec
tion
(bar
n)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Frehaut et al.,1980Mather et al., 1972presentBrown et al., 2004JEFF-3.1JENDL-3.3ENDF/B-VII.0
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
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235U(n,F) ν of PFN 238U(n,F)235U(n,F), NEUTRON MULTIPLICIY
NEUTRON ENERGY, MeV0 5 10 15 20
ν
0
1
2
3
4
5
6 FREHAUT ET AL., 1982FREHAUT ET AL., 1980GWIN ET AL., 1980HOWE, 1984 KHOKHLOV ET AL., 1994νp(n,F)
νp(n,f)
νp(n,nf)
νp(n,2nf)
En,M∋B0 4 8 12 16 20
ν
0
1
2
3
4
5 Frehaut [45]Nurpeisov et al. [46]Malinovskij et al. [47]Vorob'jova et al. [48]Savin et al. [49]Zongyu [50](n,F)(n,f) (n,nf) (n,2nf) (n,3nf)
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
35
238_U(n,F) En=7 MeV 235_U(n, F),
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
36235U(n,F) FISSION NEUTRON SPECTRUM En=7 MeV
neutron energy, MeV0,1 1 10
R(E
n,ε)
0,4
0,6
0,8
1,0
1,2
1,4
1,6
1,8
2,01Maslov et al., 20052ENDF/B-VII.0, Frehaut et al., 19753JEFF-3.1,4present
1
2
3
1
4
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
37
235U(n,F) [PFNS En=7 МeV] 238U(n,F)
ε, M∋B 0 5 10 15 20
ii
n
10-5
10-4
10-3
10-2
10-1
100
235U(n,F)235U(n,f)235U(n,nf)
ε, M∋B 0 2 4 6 8 1
S( ε
,En)
,1/ M
∋ B0.001
0.010
0.100
(n,F)(n,f)(n,nf)
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
38
235U PROMPT FISSION NEUTRON SPECTRUM, En=14.7 MeV
NEUTRON ENERGY, MeV0,1 1 10
R(E
n,ε)
0,6
0,8
1,0
1,2
1,4
1,6Boykov et al., 1994JENDL-3.3ENDF/B-VIMaslov et al., 1999 JEFF-3.1ENDF/B-VII.0present
235U PROMPT FISSION NEUTRON SPECTRUM, En=14.7 MeV
NEUTRON ENERGY, MeV10
R(E
n,ε)
0,6
0,8
1,0
1,2
1,4
1,6Boykov et al., 1994JENDL-3.3ENDF/B-VIMaslov et al., 1999 JEFF-3.1ENDF/B-VII.0present
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
39
235U PARTIAL FISSION NEUTRON SPECTRA, En=14.7 MeV
NEUTRON ENERGY, MeV0 5 10 15 20
β iSi(E
n), 1
/MeV
10-5
10-4
10-3
10-2
10-1
100
235U(n,F)235U(n,f)235U(n,nf)235U(n,2nf)
235U PARTIAL FISSION NEUTRON SPECTRA, En=20MeV
NEUTRON ENERGY, MeV0 5 10 15 20
β iSi(E
), 1/
MeV
10-5
10-4
10-3
10-2
10-1
100
235U(n,F)235U(n,f)235U(n,nf)235U(n,n2nf)235U(n,3nf)
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
40
235U En=14.7 MeVCOMPONENTS OF FIRST NEUTRON SPECTRUM
NEUTRON ENERGY, MeV0 4 8 12
NE
UTR
ON
SP
EC
TRU
M, B
/MeV
0.001
0.010
0.100
(n,nX)(n,n')(n,nf)1
(n,2n)1
(n,2nf)1
(n,3n)1
235U En=14.7 MeVCOMPONENTS OF SECOND NEUTRON SPECTRUM
NEUTRON ENERGY, MeV0 2 4 6 8
NE
UTR
ON
SP
EC
TRU
M, B
/MeV
10-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1
100
(n,2nX)2
(n,2n)2
(n,2nf)2
(n,3n)2
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
41235U: AVERAGE ENERGY OF PFNS
NEUTRON ENERGY, MeV
0 2 4 6 8 10 12 14 16 18 20
<E>,
MeV
1,9
2,0
2,1
2,2
2,3
2,4Kornilov et al., 1998Smirenkin et al, 1994Boykov et al., 1994Ethvignot et al., 2005
ENDF/B-VIJENDL-3.3Maslov et al., 2005ENDF/B-VII.0
1
present
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
42
Neutron energy (MeV)
0 5 10 15 20
238U(n,f) prompt fission neutron average energies, 0.6<ε<7.5 MeV
<ε>,
MeV
2.1
2.2
2.3
2.4
2.5
2.6 PresentEthvignot et al., 2003Boykov et al., 1991Kornilov et al., 1980Lovchikova et al., 2000
JENDL-3.3 CEA, 2005ENDF/B-VI 232ThpreENDF/B-VII
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
43
235U(n,F) &238U(n,F)AVERAGE ENERGY OF PFNS
En, MeV
0 2 4 6 8 10 12 14 16 18 20
<ε>,
MeV
2.0
2.1
2.2
2.3
2.4
2.5
2.6
235U(n,F), PRESENT, 0.8<ε<7.5 MeV235U(n,F), ENDF/B-VI, 0.8<ε<7.5 MeV235U(n,F), JENDL-3.3, 0.8<ε<7.5 MeV238U(n,F), Ethvignot et al. (2003)238U(n,F), PRESENT, 0.65<ε<7.5 MeV235U(n,F), Bertin et al., 1976
235U(n,F)
238U(n,F)
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
44
U - THERMAL REGION, TRIPOLI-4.4 calculations by J-C Sublet
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Kef
f
0,995
1,000
1,005
1,010 EXPERIMENTJEFF-3.1JEFF-3.1.1present
c-1
LCT-006
Hec
tor
Tops
y-N
ITo
psy-
UR
LCT-
027
LCT-
10
Pb refl.
c-3
c-4
c-8
c-9
c-13
c-14
c-18
LCT-007Valduc
LCT-039Valduc
c-1
c-2
c-3
c-5
c-6
c-7
c-1
c-4
c-6
c-20c-1
c-1
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
45HST (SOLUTIONS), TRIPOLI, calcualtions by J.-C. Sublet
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
Kef
f
0,980
0,985
0,990
0,995
1,000
1,005
1,010
EXPERIMENTJEF-3.1JEF-3.1.1JEFF-3.1.1+PFNS
HST001 HST009 HST010
HST
012
HST013 HST018
HST
019
HST011 HST
032
c-1
c-2
c-3
c-4
c-5
c-6
c-7
c-8
c-9
c-1
c-2
c-3
c-4
c-1
c-2
c-3
c-4
c-1
c-2
c-1
c-1
c-2
c-3
c-4
c-1
c-3
c-2
c-1
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
46FAST REGION, TRIPOLI, calcualtions by J.-C. Sublet
1 2 3 4 5 6 7 8 9 10 11 12 13
Kef
f
0,980
0,985
0,990
0,995
1,000
1,005
EXPERIMENT JEFF-3.1
JEFF-3.1.1 JEFF-3.1.1+PFNS
Big Ten
deta
.
sim
p.
t.z.h
.
ZPR(16%)
c-1
ZPR-U9
c-1
IMF-002
c-1
Jemimac-
2 c-3
c-4
Godiva
c-1
c-2
Jezebel Jez. 240
c-1
c-1
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
47HEU-MET-FAST, TRIPOLI, Morillon et al.
Kef
f
0,992
0,994
0,996
0,998
1,000
1,002
1,004
1,006
1,008
BRC2009 ENDF/B-VII.0 PFNS by Maslov et al., 2005PFNS, present
01a
01b
God
iva
013
18a
32a
32d
04a
04b
04c
008
011
014
015
18b
028
32b
32c
wat
er re
flect
or
w/o
refle
ct.
ref.
poly
ethy
lene
ref.
rod
ref.
238 U
app
.
Cyl
. w/o
ref
w/o
ref.
Flat
top
ref.
238 U
ref.
238 U
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
48IEU MET FAST, TRIPOLI, Morillon et al.
Kef
f
0,994
0,996
0,998
1,000
1,002
1,004
1,006
BRC09 ENDF/B-VII.0PFNS by Maslov et al., 2005PFNS, present
01a
01b
Jemima
01c
01d
07A
07B
Big Ten
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
49
ε, MeV0,1 1 10
R(E
th, ε
), <E
n>=1
.964
MeV
0,6
0,7
0,8
0,9
1,0
1,1
B.I. Starostov et al., YK, 3, p. 16 (1985),renormalized preENDF/B-VIILANL, 2003, ν(A), Nishio et al., 1998 ENDF/B-VII=ENDF/B-VI.8
PRESENTHambsch et al., 2009
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
50
Conclusions1. 235U PFNS data are fitted (except 2.9, 5 MeV) 2. The energy balance model for the multi-chance fission
is validated for Eth<En<20 MeV describing fission cross sections,PFNS, and neutron multiplicities.
3. Pre-fission (n,xnf) spectra+ neutrons from the fission fragments - a number of peculiarities in 235U(n,f) are interpreted.
4. LCT – positive biases in k_eff (200-300 pcm) withJEFF-3.1.1+PFNS(235U)
5. HEU_MET_FAST negative biases in k_eff (200-300 pcm) with JEFF-3.1.1+PFNS(235U)
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
51
Conclusions6. HST – positive biases in k_eff (500 pcm) with JEFF-
3.1.1+PFNS(235_U)7.HEU_MET_FAST small +- biases in k_eff (50-60 pcm)
with ENDF/B-VII.0-compensation effect- shapes are drastically different
8. IEU_MET_FAST- sensitivity to tweaked csspossibly 238_U capture
9. Similar effects are envisioned for PST,MCT
V. M. Maslov , WONDER2009, Cadarache,29/09-02/10, 2009
52
neutron energy ( MeV)0 5 10 15 20
<E>(
MeV
)
1.8
2.0
2.2
2.4
232Th238U239Pu
235U
232Th 238U 239Pu235UMadland, 2006