sensitivity of activation cross sections of tungsten to nuclear reaction mechanisms
DESCRIPTION
EFF-DOC-893. Sensitivity of Activation Cross Sections of Tungsten to Nuclear Reaction Mechanisms. 1 EURATOM-MEC Fusion Association, “Horia Hulubei” National Institute for Physics & Nuclear Engineering, P.O Box MG-6, 76900 Bucharest, Romania - PowerPoint PPT PresentationTRANSCRIPT
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
1
Sensitivity of Activation Cross Sections of Tungsten to Nuclear Reaction Mechanisms
V. Avrigeanu1, R. Eichin2, R.A. Forrest3, H. Freiesleben2, M. Herman4, A.J. Koning5, and K. Seidel2
EFF-DOC-893
1EURATOM-MEC Fusion Association, “Horia Hulubei” National Institute for Physics & Nuclear Engineering, P.O Box MG-6, 76900 Bucharest, Romania2EURATOM-FZK/TUD Fusion Association, Technische Universität Dresden, D-01062 Dresden, Germany3EURATOM-UKAEA Fusion Association, Culham Science Center, Abingdon OX143DB, United Kingdom4Brookhaven National Laboratory, P.O. Box 5000, Upton, NY 11973-50005Nuclear Research and Consultancy Group NRG, P.O. Box 25, 1755 ZG Petten, The Netherlands
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Outline [e.g.1, EFF-DOC-872, Nov. 2003]
• Nuclear cross sections calculations- Search for appropriate optical model potentials: n+182,183,184,186W
- p+ 181Ta- Compilation of the available experimental data (E<20 MeV)- Nuclear model calculations (E<20 MeV)- Comparison with all activation experimental data
• Processing of model calculations results- Cross sections of all individual channels with activation data-
• • [Benchmark experiment analysis updating
– calculated-to-experimental (C/E) activity: reduced deviation from unity ]
1P. Pereslavtsev and U. Fischer, Evaluation of n+184W cross-section data for EFF up to 150 MeV
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Flowchart of model calculations
• EMPIRE-II v.2.18 [ECIS95/SCAT2, DEGAS, MSD-TUL/MSC-H, HF]
t, R, CC, abs - Tl(E) neutron deformed optical potential - p-, - spherical optical potentials - EMPIRE-specific level density, Nmax< 40
- DEGAS [g=A/13 MeV-1, K=100 MeV3]
• STAPRE-H v.2002 [SCAT2, GDH, HF] - p-, - spherical optical potentials - BSFG, E*<Bn: (a, D0-, Nmax-fit a(E*), E*>Bn: Junghans/Koning/Chadwick I/Ir: 0.5(g.s.)-0.75(Bn)-1(15 MeV) - GDH [ gFGM(), AK(p,h), fK(p,h,E,F1(l,Ei)) ]
• TALYS-0.58 [Koning and Duijvestijn]
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Optical model potentials
• Neutrons (n+182,183,184,186W): SPRT analysis (SPR added in EMPIRE-II output)
– P.G. Young+ (1990) [as RIPL-2 in EMPIRE-II] (local)
– J.P. Delaroche, as in NEANDC-253”U”, OECD/NEA-DB, 1989 (local)
– P.G. Young, NEANDC-222”U”, OECD/NEA-DB, 1986 (global: II.B)
– P.G. Young+ (1990) - modified (local)
– RIPL-2/P.G. Young+ (1986) - modified (local)
• Protons (p+181Ta)– R.L. Walter and P.P. Guss, Rad. Effects 92, 1079 (1986) (global)
– N. Yamamuro, NDST-1988, Mito, Japan, p.489 (global)
– Walter-Guss (1986) - modified (local)
• Alphas– V. Avrigeanu, P.E. Hodgson, M. Avrigeanu, Phys.Rev.C 49,2137(1994) (global)
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Optical model parameters used to describe the scattering of neutrons on W isotopes, and the corresponding absorption cross section for the
element W at the incident neutron energy E=14.1 MeV
Optical Potential(MeV)
R(fm)
A(fm)
abs (W)
(b)Modified Young (1986) Potential 2.627a
VR=49.8-0.3E-16b 1.26 0.61WV=-0.70+0.12, E>5.8 MeV 1.26 0.61WD=5.0+0.8E-8eV 12.2-0.1E-8eV
1.26 0.52
VSO=6.2 1.12 0.47Modified RIPL-2 Potential 2.402a
VR=49.23-0.25E-16eV =49.73-0.30E-16, E>10MeV
1.26+0.0033E, E<10 MeV1.359-0.0066E, 10<E<15 MeV1.26, E>15MeV
0.62+0.001E, E<10 MeV0.65-0.002E, 10<E<15MeV0.62, E>15MeV
WV=-1.4+0.2E, E>7 MeV 1.26 0.61WD=6.57+0.4E-8, E<4.5 MeV 8.82-0.1E-8, E>4.5 MeV
1.26 0.45
VSO=6.2 1.12 0.47a For comparison with the sum of
non=2.36±0.05 b at incident energy E=14.1 MeVcorresponding to inelastic scattering from above ~2 MeV of the excitation energy18, and a crosssection of ~0.04 b for statistical inelastic scattering on low-lying levels below ~2 MeV.
b =(N-Z)/A
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Comparison of experimental and calculated neutron scattering parameters of 182,184,186W
PotentialS0*104
182WS1*104 R’(fm) S0*104
184WS1*104 R’(fm) S0*104
186WS1*104 R’(fm)
Exp.20 2.3(3) 7.3(3) 2.8(4) 0.58(7) 7.3(3) 2.1(4) 0.37(5) 7.3(3)RIPL-24 2.69 0.90 7.13 3.01 0.77 7.31 3.23 0.69 7.82Ref.15 2.55 1.14 7.37 2.75 0.99 7.51 2.80 0.87 7.86Ref.16 2.39 1.17 7.40 2.58 1.02 7.49 2.66 0.91 7.79Ref.16-mod. 2.23 1.07 7.38 2.41 0.94 7.46 2.52 0.85 7.74RIPL2-mod 2.24 1.11 7.46 2.39 0.99 7.52 2.57 0.90 7.74
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Comparison of calculated and experimental neutron total cross sections for 182,183,184,186W isotopes with emphasis of the lower energy region
0.1 1 10
5
6
7
8
9Whalen+ (1966)Martin+ (1967)Foster+ (1971)Djumin+ (1977)Guenther+ (1982)Knopf+ (1987)Dietrich+ (2003)
RIPL2 (Young+, 1990) Vonach-Nagel (1989) Young (1986)/Set II-B RIPL2-mod. (a)
n + 182
W
(b)
0.01 0.1 1 10
10
RIPL2 (Young+,1990) Vonach-Nagel (1989) Young (1986)/Set II-B RIPL2-mod. (b)
n + 183
W Ohkubo+ (1978) #1 Ohkubo+ (1978) #2 Knopf+ (1982)
Abfalterer+ (2001): nat
W
0.1 1 10
5
6
7
8
9Whalen+ (1966)Martin+ (1967)Foster+ (1971)Djumin+ (1977)Guenther+ (1982)Knopf+ (1982) Dietrich+ (2003)
(c)
n + 184
W
RIPL2 (Young+, 1990) Vonach-Nagel (1989) Young (1986)/Set II-B RIPL2-mod.
(b
)
En (MeV)0.1 1 10
5
6
7
8
9 Whalen+ (1966) Martin+ (1967) Foster+ (1971) Djumin+ (1977) Guenther+ (1982) Knopf+ (1982) Dietrich+ (2003)
(d)
n + 186
W
RIPL2 (Young+, 1990) Vonach-NagelN (1989) Young (1986)/Set II-B RIPL2-mod.
En (MeV)
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Comparison of calculated and experimental neutron total cross sections for 182,183,184,186W isotopes
5
6
7
Whalen+ (1966) Martin+ (1967) Foster+ (1971) Djumin+ (1977) Guenther+ (1982) Knopf+ (1987) Dietrich+ (2003) RIPL2 (Young, 1990) Vonach-Nagel (1989) Young (1986) RIPL-2 mod.
(a)
n + 182
W
(b
)
5
6
7 Ohkubo+ (1978) #1 Ohkubo+ (1978) #2 Knopf+ (1982)
Abfalterer+ (2001): nat
W RIPL2 (Young, 1990) Vonach-Nagel (1989) Young (1986)/Set II-B RIPL-2 mod.
(b)
n + 183
W
0 5 10 15 20 25 30
5
6
7
Whalen+ (1966)Martin+ (1967)Foster+ (1971)Djumin+ (1977)Guenther+ (1982)Knopf+ (1982) Dietrich+ (2003) RIPL2 (Young+, 1990) Vonach-Nagel (1989) Young (1986)/Set II-B RIPL-2 mod.
(c)
n + 184
W
(b
)
En (MeV)0 5 10 15 20 25 30
5
6
7
(d)
n + 186
W Whalen+ (1966) Martin+ (1967) Foster+ (1971) Djumin+ (1977) Guenther+ (1982) Knopf+ (1982) Dietrich+ (2003) RIPL2 (Young, 1990) Vonach-Nagel (1989) Young (1986)/Set II-B RIPL-2 mod.
En (MeV)
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Comparison of neutron total cross sections for 182,183,184,186W isotopes calculated by using presently modified OMPs
5
6
7
Whalen+ (1966) Martin+ (1967) Foster+ (1971) Djumin+ (1977) Guenther+ (1982) Knopf+ (1987) Dietrich+ (2003) RIPL2 (Young, 1990) - mod. Young (1986)/Set II-B mod.
(a)
n + 182
W
5
6
7 Ohkubo+ (1978) #1 Ohkubo+ (1978) #2 Knopf+ (1982)
Abfalterer+ (2001): nat
W RIPL2 (Young, 1990) -mod. Young (1986)/Set II-B - mod.
(b)
n + 183
W
0 5 10 15 20 25 30
5
6
7
Whalen+ (1966)Martin+ (1967)Foster+ (1971)Djumin+ (1977)Guenther+ (1982)Knopf+ (1982) Dietrich+ (2003) RIPL2 (Young+, 1990) - mod. Young (1986)/Set II-B mod.
(c)
n + 184
W
En (MeV)0 5 10 15 20 25 30
5
6
7
(b
)
(d)
n + 186
W Whalen+ (1966) Martin+ (1967) Foster+ (1971) Djumin+ (1977) Guenther+ (1982) Knopf+ (1982) Dietrich+ (2003) RIPL2 (Young, 1990) - mod. Young (1986)/Set II-B - mod.
En (MeV)
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Comparison of the calculated and measured proton reaction cross sections and (p,n) reaction cross sections for 181Ta
100
1
2
(a)
p + 181
Ta
Wilkins-Igo (1963) Kirkby+ (1966) Abegg+ (1979) Perey (1963) Menet+ (1971) Koning+ (2002) Walter+ (1985) WG-Yamamuro (1988) Walter+ - mod
R
(b)
En (MeV)4 8 12
1E-5
1E-4
1E-3
0.01
0.1
(b)
181Ta(p,n)
181W
Hansen+ (1962)/T0121 Chodil+ (1967)/C0693 Thomas+ (1967)/C0695 Zhuravlev+ (1984)/A0271 Perey (1963) Menet+ (1971) Koning+ (2002) Walter+ (1985) WG-Yamamuro (1988) WG -mod
(b
)
En (MeV)
Walter-Guss (1986) - modified (local): WD=10.48-0.250E+14.94, E<10 MeV 9.55-0.157E+14.94, E>10 MeV
aD= 0.742-0.0115E, E<20 MeV 0.512, E>20 MeV
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Nuclear Level Density
0 1 21
10
100
NUDAT (1994) BSFG
Bn=7.627, I
0=7/2
D0=0.0024(3) keV
178Hf
N (
E*)
E* (MeV)0 1 2
NUDAT (1994) BSFG
Bn=6.100, I
0=0
D0=0.057(6) keV
179Hf
Cumulative number of levels against excitation energy for, e.g., 178,179Hf, and corresponding prediction of the BSFG model
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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The -ray strength functions
0180W 182W 183W 184W 186W
RIPL-220 70(15) 62(15) 77(12) 69(17) 61(8)1040/D0 (Ref.30) 7.97(37) 45.6(8) 6.00(36) 5.51(25)0 (from Ref.30 and D0 of Ref.20) 48 55 42 470 for best normalization of fE1(E) 40 47 50 42 35
20A.V. Ignatyuk, at http://161.5.7.5/RIPL-2/resonances/ .28D.G. Gardner and F.S. Dietrich, Report UCRL-82998, LLNL-Livermore, 1979.29M. Avrigeanu, V. Avrigeanu, G. Cata, and M. Ivascu, Rev. Roum. Phys. 32, 837 (1987).30R.L. Macklin, D.M. Drake, and E.D. Arthur, Nucl. Sci. Eng. 89, 98 (1983).
• Modified energy-dependent Breit-Wigner (EDBW) model28,29: fE1(E)
• Comparison of experimental20,30 and the calculated average radiative widths- 0 (meV) used for normalization of fE1(E) capture data description
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Comparison of calculated and measured neutron capture cross sections of 180,182-184,186W isotopes
0.01 0.1 1
0.1
1
=70+15 meV [RIPL2]
Bokhovko+ (1986)
=70 meV 55 meV 40 meV 40 meV, E
S=0
180W(n,)181
W
(b
)
1E-3 0.01 0.1 1
0.1
1 =62+15 meV [RIPL2]
=77 meV 62 meV 47 meV 47 meV, E
S=0
Kononov+ (1965) Kapchigashev+ (1966)Friesenhahn+ (1966)Block+ (1966)Grenier+ (1981)Macklin+ (1983)Bokhovko+ (1986) Knopf+ (1987)
182W(n,)183
W
1E-3 0.01 0.1 10.01
0.1
1
10
=77+12 meV [RIPL2]
=77 meV 65 meV 50 meV 50 meV, E
S=0
Kononov+ (1965) Kapchigashev+ (1966)Friesenhahn+ (1966)Block+ (1966)Grenier (1981)Macklin+ (1983)Bokhovko+ (1986) Knopf+ (1987)
183W(n,)184
W
1E-3 0.01 0.1 10.01
0.1
1=69+17 meV [RIPL2]
=69 meV 52 meV 42 meV 42 meV, E
S=0
Kononov+ (1965) Kapchigashev+ (1966)Friesenhahn+ (1966)Block+ (1966)Joly+ (1981)Beer+ (1981)Macklin+ (1983)Bokhovko+ (1986) Knopf+ (1987)
184W(n,)185
W
(b
)
En (MeV)1E-3 0.01 0.1 1
0.01
0.1
1
En (MeV)
Bokhovko+ (1986)Knopf+ (1987)Trofimov+ (1987)Zhang+ (2001)
=61 meV 53 meV 35 meV 35 meV, E
S=0
=61+8 meV [RIPL2]
Kononov+ (1965) Kapchigashev+(1966)Friesenhahn+ (1966)Chaubey+ (1966)Zaikin+ (1968)Diksic+ (1970)Lindner+ (1976)Gleason (1977)Bradley+ (1979)Joly+ (1981)Macklin+ (1983)
186W(n,)187
W
En (MeV)
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Sample case of isomeric state populated by side- and continuum-decay cascade-feeding
10 12 14 16 18 201E-4
1E-3
0.01
0.1
1
E*=2.425 MeV, 21/2+ [16
th]
Greenwood+ (1987) TALYS_0.49 SH (2001) SH (2002)
94Mo(n,2n)93Mo
Fujino+ (1977) Rao+ (1979) Amemiya+ (1982) Marcinkowski+ (1986) Ikeda+ (1988) Kong+ (1995) Molla+(1997) IRMM (2001)
94Mo(n,2n)93Mom
(
b)
En (MeV)
[http://tandem.nipne.ro/~vavrig/Publications/2003/papmo_1z.ps]
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Comparison of the measured and calculated reaction cross sections for the target nucleus 180W
Calculated values by means of the computer codes EMPIRE-II and TALYS with default global parameters (except the local OMPs) and STAPRE-H with local parameter set given in this work.
0.01 0.1 1
0.1
1
Bokhovko+ (1986)
CC+GDH+HF EMPIRE-II TALYS-0.58
(a)
180W(n,)181
W
(b)
10 15 200.00
0.01
0.02
CC+GDH+HF TALYS-0.58
[1+ 8.152 h]
Qaim+ (1975)
(b)
180W(n,p)
180mTa
10 15 200
1
2
Qaim+ (1975)
CC+GDH+HF EMPIRE-II TALYS-0.58
(c)
180W(n,2n)
179g+mW
(b
)
En (MeV)10 15 200.0
0.4
0.8
CC+GDH+HF TALYS-0.58
[1/2- 6.4 min]
Qaim+ (1975)Filatenkov+ (2002)
(d)
180W(n,2n)
179mW
En (MeV)
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Comparison of the measured and calculated reaction cross sections for the target nucleus 182W
Calculations with EMPIRE-II and TALYS, and default global parameters (except local OMPs), and STAPRE-H with local parameter set. Normalization factor of 1.078 [Vonach+, 1990] is applied to data of Frehaut+
(1980).
1E-3 0.1
0.1
1
(b
)
CC+GDH+HF EMPIRE-II TALYS-0.58
Kononov+ (1965) Kapchigashev+ (1966)Friesenhahn+ (1966)Block+ (1966)Grenier+ (1981)Macklin+ (1983)Bokhovko+ (1986) Knopf+ (1987) (a)
182W(n,)183
W
(b
)
10 15 200
1
2
Druzhinin+ (1966)Dilg+ (1968) Maslov+ (1972)Qaim+ (1975)Frehaut+ (1980)LNZ (1997)
CC+GDH+HF EMPIRE-II TALYS-0.58
(b)
182W(n,2n)
181W
10 15 200.000
0.005
0.010
0.015
0.020
[3- 114.43 d]
Qaim+ (1975) Grallert+ (1993)LNZ (1997)Filatenkov+ (2002)
CC+GDH+HF EMPIRE-II TALYS-0.58 (c)
182W(n,p)
182Ta
10 15 200.0000
0.0002
0.0004
Qaim+ (1975) Kasugai+ (1992)Filatenkov+ (2002) CC+GDH+HF
[10- 15.84 min]
(d)
182W(n,p)
182m2Ta
10 15 201E-8
1E-6
1E-4
Qaim+ (1975) CC+GDH+HF TALYS-0.58
[25/2- 25.05 d]
182W(n,)
179m2Hf
Filatenkov+ (2002) CC+GDH+HF
[1/2- 18.67 s]
(e)
182W(n,)
179m1Hf
10 15 201E-12
1E-10
1E-8
1E-6
1E-4
[16+ 31 y]
Hanlin+ (1994)Ikeda+ (1996)LNZ (1997)Filatenkov+ (2001) CC+GDH+HF
(f)
182W(n,n')
178m2Hf
En (MeV)
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Comparison of the measured and calculated reaction cross sections for the target nucleus 183W
Calculated values by means of the computer codes EMPIRE-II and TALYS with default global parameters (except the local OMPs) and STAPRE-H with local parameter set given in this work.
1E-3 0.01 0.1 10.01
0.1
1
10
CC+GDH+HF EMPIRE-II TALYS-0.58
Kononov+ (1965) Kapchigashev+ (1966)Friesenhahn+ (1966)Block+ (1966)Grenier (1981)Macklin+ (1983)Bokhovko+ (1986) Knopf+ (1987) (a)
183W(n,)184
W
(b)
10 15 200.00
0.01
0.02
Qaim+ (1975) Grallert+ (1993)Filatenkov+ (2002)
CC+GDH+HF EMPIRE-II TALYS-0.58
(b)
183W(n,p)
183Ta
10 15 200.0000
0.0002
0.0004
[8- 5.5 h]
Qaim+ (1975)Filatenkov+ (2002) CC+GDH+HF TALYS-0.58
(a)
183W(n,)
180mHf
(b
)
En (MeV)10 15 200
1
2
CC+GDH+HF EMPIRE-II TALYS-0.58
Frehaut+ (1980)
(d)
183W(n,2n)
182W
En (MeV)
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Comparison of the measured and calculated reaction cross sections for the target nucleus 184W
Calculations with EMPIRE-II and TALYS, and default global parameters (except local OMPs), and STAPRE-H with local parameter set. Normalization factor of 1.078 [Vonach+, 1990] is applied to data of Frehaut+ (1980).
1E-3 0.01 0.1 10.01
0.1
1
(b
)
CC+GDH+HF EMPIRE-II TALYS-0.58
Kononov+ (1965) Kapchigashev+ (1966)Friesenhahn+ (1966)Block+ (1966)Joly+ (1981)Beer+ (1981)Macklin+ (1983)Bokhovko+ (1986) Knopf+ (1987) (a)
184W(n,)185
W
(b
)
10 15 200.000
0.005
0.010
0.015
Qaim+ (1975)Ikeda+ (1988)Kasugai+ (1992)Grallert+ (1993)LNZ (1997)Filatenkov+ (1999)Filatenkov+ (2002)
CC+GDH+HF EMPIRE-II TALYS-0.58
(b)
184W(n,p)
184Ta
10 15 200.000
0.001
0.002
0.003
(c)
CC+GDH+HF TALYS-0.58
Qaim+ (1975) Kasugai+ (1992) Grallert+ (1993)Filatenkov+ (2002)
184W(n,)
181Hf
En (MeV)
10 15 200
1
2
Frehaut+ (1980)
184W(n,3n)182W
CC+GDH+HF EMPIRE-II TALYS-0.58
(d)
184W(n,2n)
183W
10 15 200.0
0.5
1.0
En (MeV)
Prasad+ (1966) Anders+ (1982)
[11/2+ 5.2 s]
CC+GDH+HF TALYS-0.58
(e)
184W(n,2n)
183mW
En (MeV)
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Comparison of the measured and calculated reaction cross sections for the target nucleus 186W
Calculations with EMPIRE-II and TALYS, and default global parameters (except local OMPs), and STAPRE-H with local parameter set. Normalization factor of 1.078 [Vonach+, 1990] is applied to data of Frehaut+ (1980).
1E-3 0.01 0.1 10.01
0.1
1
(b
)
(a)
Bokhovko+ (1986)Knopf+ (1987)Trofimov+ (1987)Zhang+ (2001)
CC+GDH+HF EMPIRE-II TALYS-0.58
Kononov+ (1965) Kapchigashev+(1966)Friesenhahn+ (1966)Chaubey+ (1966)Zaikin+ (1968)Diksic+ (1970)Lindner+ (1976)Gleason (1977)Bradley+ (1979)Joly+ (1981)Macklin+ (1983)
186W(n,)187
W
(b
)
10 15 200.000
0.003
0.006
0.009
Coleman+ (1959)Poularikas+ (1960) Mukherjee+ (1963) Qaim+ (1975)Kasugai+ (1992)Sutoh+ (1994)Murahira+ (1995)Filatenkov+ (1999)Filatenkov+ (2002)
CC+GDH+HF EMPIRE-II TALYS-0.58
(b)
186W(n,p)
186Ta
10 15 200.0000
0.0005
0.0010
0.0015
Qaim+ (1975)Ikeda+ (1988)Kasugai+ (1992)Grallert+ (1993)LNZ (1997)Filatenkov+ (2002)
CC+GDH+HF TALYS-0.58
(c)
186W(n,)
183Hf
En (MeV)
10 15 200
1
2186
W(n,3n)184
W
CC+GDH+HF EMPIRE-II TALYS-0.58
Druzhinin+ (1966)Frehaut+ (1980) LNZ (1997)Filatenkov+ (2002)
(d)
186W(n,2n)
185W
10 15 200.0
0.5
1.0
1.5
En (MeV)
Rurarz+ (1971) Kao+ (1974)Qaim+ (1975)Filatenkov+ (1999)
[11/2+ 1.67 min]
CC+GDH+HF TALYS-0.58
(e)
186W(n,2n)
185mW
En (MeV)
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
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Sensitivity of calculated (n,2n) reaction cross sections vs. reaction mechanisms & model parameters
Calculations with EMPIRE-II and default global parameters excepting local OMPs. A normalization factor of 1.078 (Vonach+, 1990) was applied to data of Frehaut+ (1980).
0
1
2
Druzhinin+ (1966)Dilg+ (1968) Maslov+ (1972)Qaim+ (1975)Frehaut+ (1980)LNZ (1997)
n/RIPL-2 mod., MSD/MSC n/RIPL-2 mod., DEGAS n/RIPL-2, DEGAS (a)
182W(n,2n)
181W
10 15 200
1
2
Frehaut+ (1980)
n/RIPL-2 mod., MSD/MSC n/RIPL-2 mod., DEGAS n/RIPL-2, DEGAS
(b)
183W(n,2n)
182W
0
1
2
Frehaut+ (1980)
184W(n,3n)
182W
n/RIPL-2 mod., MSD/MSC n/RIPL-2 mod., DEGAS n/RIPL-2, DEGAS
(c)
184W(n,2n)
183W
10 15 200
1
2
En (MeV)
(b
)
(b)
186W(n,3n)
184W
n/RIPL-2 mod., MSC/MSD n/RIPL-2 mod., DEGAS n/RIPL-2, DEGAS
Druzhinin+ (1966)Frehaut+ (1980) LNZ (1997)Filatenkov+ (2002)
(d)
186W(n,2n)
185W
En (MeV)
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
21
Sensitivity of calculated (n,p) reaction cross sections vs. reaction mechanisms & model parameters
Calculations with EMPIRE-II and default global parameters excepting local OMPs.
0.000
0.005
0.010
[3- 114.43 d]
Qaim+ (1975) Grallert+ (1993)LNZ (1997)Filatenkov+ (2002)
n/RIPL-2 mod., MSD/MSC n/RIPL-2 mod., DEGAS n/RIPL-2, DEGAS (a)
182W(n,p)
182Ta
(b
)
10 15 200.000
0.004
0.008
Qaim+ (1975) Grallert+ (1993)Filatenkov+ (2002)
n/RIPL-2 mod., MSD/MSC n/RIPL-2 mod., DEGAS n/RIPL-2, DEGAS (b)
183W(n,p)
183Ta
(b
)
0.000
0.004
0.008
184W(n,pn)183Ta
Qaim+ (1975)Ikeda+ (1988)Kasugai+ (1992)Grallert+ (1993)LNZ (1997)Filatenkov+ (1999)Filatenkov+ (2002)
n/RIPL-2 mod., MSD/MSC n/RIPL-2 mod., DEGAS n/RIPL-2, DEGAS
(c)
184W(n,p)
184Ta
10 15 200.000
0.002
0.004
En (MeV)
186W(n,pn)
185Ta
Coleman+ (1959)Poularikas+ (1960) Mukherjee+ (1963) Qaim+ (1975)Kasugai+ (1992)Sutoh+ (1994)Murahira+ (1995)Filatenkov+ (1999)Filatenkov+ (2002)
n/RIPL-2 mod., MSD/MSC n/RIPL-2 mod., DEGAS n/RIPL-2, DEGAS
(d)
186W(n,p)186Ta
En (MeV)
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
22
Sensitivity of calculated (n,p) reaction cross sections vs. reaction mechanism codes
Calculations with EMPIRE-II and TALYS, and default global parameters (except local OMPs), and STAPRE-H with local parameter set.
0.00
0.01
0.02
[3- 114.43 d]
Qaim+ (1975) Grallert+ (1993)LNZ (1997)Filatenkov+ (2002)
CC+GDH+HF EMPIRE-II TALYS-0.58
(a)
182W(n,p)
182Ta
(b
)
10 15 200.00
0.01
0.02
Qaim+ (1975) Grallert+ (1993)Filatenkov+ (2002)
CC+GDH+HF EMPIRE-II TALYS-0.58
(b)
183W(n,p)
183Ta
(b
)
En (MeV)
0.000
0.005
0.010
0.015
Qaim+ (1975)Ikeda+ (1988)Kasugai+ (1992)Grallert+ (1993)LNZ (1997)Filatenkov+ (1999)Filatenkov+ (2002)
CC+GDH+HF EMPIRE-II TALYS-0.58
(c)
184W(n,p)
184Ta
10 15 200.000
0.005
0.010
Coleman+ (1959)Mukherjee+ (1963) Qaim+ (1975)Kasugai+ (1992)Sutoh+ (1994)Murahira+ (1995)Filatenkov+ (1999)Filatenkov+ (2002)
CC+GDH+HF EMPIRE-II TALYS-0.58(d)
186W(n,p)186Ta
En (MeV)
EFF-DOC-893, EFF/EAF Monitoring Meeting, NEA-DB, Paris, May 10-12, 2004
23
Conclusions• Achievements
- Appropriate optical model potentials: n+182,183,184,186W- Unitary description of all activation experimental data (E<20 MeV) by
using a local parameter set in STAPRE-H code- Good results of blind calculations and global parameters within
EMPIRE-II and TALYS codes- Similar sensitivity of calculations vs. reaction mechanisms & model
parameters
• Problems- Major uncertainty of calculated isomeric cross sections: level schemes
& branching ratios
- (n,p)-, (n,)-reaction excitation functions at En>15 MeV
• Completion - Similar analysis for: n+180,181Ta, n+174,176,177,178,179,180Hf
- Need for (n,p)-, (n,)-reaction data at En>15 MeV (e.g., JRC/IRMM)