comparison between the smm and gemini++ de-excitation models … · 2009. 5. 6. · 150 175 200 150...
TRANSCRIPT
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Physical ingredients Results Conclusions
Comparison between the SMM and GEMINI++de-excitation models
D. Mancusi1 J. Cugnon1 A. Boudard2 S. Leray2
A. Botvina3 R. Charity4
1IFPA, University of Liège, Belgium
2SPhN, IRFU, CEA, Saclay, France
3Reactions and nuclear astrophysics, GSI, Darmstadt, Germany
4Department of Chemistry, Washington University, St. Louis, MO, U.S.A.
5th May 2009 — Satellite Meeting on Spallation ReactionsAccApp’09, Vienna (Austria)
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Physical ingredients Results Conclusions
Outline
1 Physical ingredientsCascade stageDe-excitation stage
2 ResultsResidue cross sectionsNeutron spectraLight clusters
3 Conclusions
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Physical ingredients Results Conclusions
INCL4.5
Features
INCLDeveloped by ULg@Liège,CEA@SaclayBinary nucleon-nucleoncollisionsNucleus (remnant) left inan excited state
Must be coupled to apre-equilibrium /de-excitation code
-
Physical ingredients Results Conclusions
INCL4.5
Features
INCLDeveloped by ULg@Liège,CEA@SaclayBinary nucleon-nucleoncollisionsNucleus (remnant) left inan excited state
Must be coupled to apre-equilibrium /de-excitation code
-
Physical ingredients Results Conclusions
The SMM model
SMM = Statistical Multifragmentation Model
De-excitation mechanismsSimultaneous break-up
Thermodynamical configurationweightsRemnant splits in several “chunks”
Fragment de-excitationFermi break-upEvaporation Z ≤ 2 (Weisskopf-Ewing)Fission (Bohr-Wheeler)
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Physical ingredients Results Conclusions
The SMM model
SMM = Statistical Multifragmentation Model
De-excitation mechanismsSimultaneous break-up
Thermodynamical configurationweightsRemnant splits in several “chunks”
Fragment de-excitationFermi break-upEvaporation Z ≤ 2 (Weisskopf-Ewing)Fission (Bohr-Wheeler)
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Physical ingredients Results Conclusions
The GEMINI++ model
De-excitation mechanismsNo simultaneous break-upSequence of binary decaysEvaporation Z ≤ 3 (Hauser-Feshbach)Asymmetric fission Z > 3 (Moretto)Symmetric fission (Bohr-Wheeler)
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Physical ingredients Results Conclusions
The GEMINI++ model
De-excitation mechanismsNo simultaneous break-upSequence of binary decaysEvaporation Z ≤ 3 (Hauser-Feshbach)Asymmetric fission Z > 3 (Moretto)Symmetric fission (Bohr-Wheeler)
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Physical ingredients Results Conclusions
1-GeV p + 56Fe
1
10
10 2
0 10 20 30 40 50A
Cro
ss S
ecti
on
(m
b)
INCL45-SMM
INCL45-GEMINI++
-
Physical ingredients Results Conclusions
1-GeV p + 56Fe
1
10
10 2
0 5 10 15 20 25Z
Cro
ss S
ecti
on
(m
b)
INCL45-SMM
INCL45-GEMINI++
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Physical ingredients Results Conclusions
1-GeV p + 56Fe
P. Napolitani et al., PRC70 (2004)
SMM improves with pre-equilibrium
IMF productionSMM→ multifragmentationGEMINI++→ asymmetricfissionThe question is not settled
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Physical ingredients Results Conclusions
1-GeV p + 56Fe
P. Napolitani et al., PRC70 (2004)
SMM improves with pre-equilibrium
IMF productionSMM→ multifragmentationGEMINI++→ asymmetricfissionThe question is not settled
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Physical ingredients Results Conclusions
1-GeV p + 56Fe
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
0 20 40 0 20 40 0 20 40
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Physical ingredients Results Conclusions
1-GeV p + 56Fe
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
40 50 40 50 40 50
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Physical ingredients Results Conclusions
1-GeV p + 208Pb
1
10
10 2
0 25 50 75 100 125 150 175 200A
Cro
ss S
ecti
on
(m
b)
INCL45-SMM
INCL45-GEMINI++
-
Physical ingredients Results Conclusions
1-GeV p + 208Pb
1
10
10 2
0 10 20 30 40 50 60 70 80Z
Cro
ss S
ecti
on
(m
b)
INCL45-SMM
INCL45-GEMINI++
-
Physical ingredients Results Conclusions
1-GeV p + 208Pb
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
50 100 50 100 50 100
-
Physical ingredients Results Conclusions
1-GeV p + 208Pb
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
52.94 83.61 114.28 144.9452.94 83.61 114.28 144.9452.94 83.61 114.28 144.94
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Physical ingredients Results Conclusions
1-GeV p + 208Pb
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
122.02 147.96 173.89 199.83122.02 147.96 173.89 199.83122.02 147.96 173.89 199.83
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Physical ingredients Results Conclusions
1-GeV p + 208Pb
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
150 175 200 150 175 200 150 175 200
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Physical ingredients Results Conclusions
1-GeV p + 238U
1
10
10 2
0 25 50 75 100 125 150 175 200 225A
Cro
ss S
ecti
on
(m
b)
INCL45-SMM
INCL45-GEMINI++
-
Physical ingredients Results Conclusions
1-GeV p + 238U
1
10
10 2
0 10 20 30 40 50 60 70 80 90Z
Cro
ss S
ecti
on
(m
b)
INCL45-SMM
INCL45-GEMINI++
-
Physical ingredients Results Conclusions
1-GeV p + 238U
1
10
10 2
0 10 20 30 40 50 60 70 80 90Z
Cro
ss S
ecti
on
(m
b)
INCL45-SMM
INCL45-GEMINI++
Not enoughIMFs!
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Physical ingredients Results Conclusions
1-GeV p + 238U
10-3
10-2
10-1
1
10
0 1 2 3 4 5 6 7 8Excitation energy E* (MeV/nucleon)
dσ/
dE
* (
mb
/(M
eV/n
ucl
eon
))
56Fe
208Pb
238U No break-upin Pb and U!
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Physical ingredients Results Conclusions
1-GeV p + 238U
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
50 100 50 100 50 100
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Physical ingredients Results Conclusions
1-GeV p + 238U
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
100 150 100 150 100 150
-
Physical ingredients Results Conclusions
1-GeV p + 238U
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
125 150 125 150 125 150
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Physical ingredients Results Conclusions
1-GeV p + 238U
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
150 200 150 200 150 200
-
Physical ingredients Results Conclusions
In short
GEMINI++ has good fission and spallation yieldsSMM less good for fission
SMM prefers pre-equilibrium + de-excitation
IMF production mechanism?
-
Physical ingredients Results Conclusions
In short
GEMINI++ has good fission and spallation yieldsSMM less good for fission
SMM prefers pre-equilibrium + de-excitation
IMF production mechanism?
-
Physical ingredients Results Conclusions
In short
GEMINI++ has good fission and spallation yieldsSMM less good for fission
SMM prefers pre-equilibrium + de-excitation
IMF production mechanism?
-
Physical ingredients Results Conclusions
In short
GEMINI++ has good fission and spallation yieldsSMM less good for fission
SMM prefers pre-equilibrium + de-excitation
IMF production mechanism?
-
Physical ingredients Results Conclusions
1.2-GeV p + 208Pb
1200 MeV p + pb208, n spectra
10-14
10-13
10-12
10-11
10-10
10-9
10-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 2
10 3
1 10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
-
Physical ingredients Results Conclusions
In short
1200 MeV p + pb208, n spectra
10-14
10-13
10-12
10-11
10-10
10-9
10-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 2
10 3
1 10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
SMM spectra look too cold. . . pre-equilibrium might help
-
63-MeV p + 208Pb (low energy)
63 MeV p + pb208, n spectra
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 2
10 3
1 10Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
63 MeV p + pb208, p spectra
10-14
10-13
10-12
10-11
10-10
10-9
10-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 2
10Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
-
63-MeV p + 208Pb (low energy)
63 MeV p + pb208, d spectra
10-15
10-14
10-13
10-12
10-11
10-10
10-9
10-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
63 MeV p + pb208, t spectra
10-15
10-14
10-13
10-12
10-11
10-10
10-9
10-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
-
Physical ingredients Results Conclusions
1.2-GeV p + 181Ta (high energy)
1200 MeV p + ta181, n spectra
10-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 2
1 10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
1200 MeV p + ta181, p spectra
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 2
10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
-
Physical ingredients Results Conclusions
1.2-GeV p + 181Ta (high energy)
1200 MeV p + ta181, d spectra
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
1200 MeV p + ta181, t spectra
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
-
Physical ingredients Results Conclusions
1.2-GeV p + 181Ta (high energy)
1200 MeV p + ta181, He3 spectra
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
1200 MeV p + ta181, a spectra
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 2
10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
-
Physical ingredients Results Conclusions
In short
Low-energy LCP yields are insensitive to de-excitationVery little 3He in de-excitationGEMINI++ sensibly better than SMM
No multifragmentationMore accurate evaporation model
-
Physical ingredients Results Conclusions
In short
Low-energy LCP yields are insensitive to de-excitationVery little 3He in de-excitationGEMINI++ sensibly better than SMM
No multifragmentationMore accurate evaporation model
-
Physical ingredients Results Conclusions
In short
Low-energy LCP yields are insensitive to de-excitationVery little 3He in de-excitationGEMINI++ sensibly better than SMM
No multifragmentationMore accurate evaporation model
-
Physical ingredients Results Conclusions
In short
Low-energy LCP yields are insensitive to de-excitationVery little 3He in de-excitationGEMINI++ sensibly better than SMM
No multifragmentationMore accurate evaporation model
-
Physical ingredients Results Conclusions
In short
Low-energy LCP yields are insensitive to de-excitationVery little 3He in de-excitationGEMINI++ sensibly better than SMM
No multifragmentationMore accurate evaporation model
-
Physical ingredients Results Conclusions
Summary
SMM needs a pre-equilibrium modelGEMINI++ has accurate physics
. . . but it is ∼20 times slower than SMM!
IMF production could be improved
-
Physical ingredients Results Conclusions
Summary
SMM needs a pre-equilibrium modelGEMINI++ has accurate physics
. . . but it is ∼20 times slower than SMM!
IMF production could be improved
-
Physical ingredients Results Conclusions
Summary
SMM needs a pre-equilibrium modelGEMINI++ has accurate physics
. . . but it is ∼20 times slower than SMM!
IMF production could be improved
-
Physical ingredients Results Conclusions
Summary
SMM needs a pre-equilibrium modelGEMINI++ has accurate physics
. . . but it is ∼20 times slower than SMM!
IMF production could be improved
-
Physical ingredients Results Conclusions
The end
Thank you for your attention!
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1-GeV p + 56Fe10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
0 20 40 0 20 40 0 20 40
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1-GeV p + 56Fe
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
10-1
1
10
0 20 40 0 20 40 0 20 40
-
1-GeV p + 56Fe
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
40 50 40 50 40 50
-
1-GeV p + 208Pb
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
50 100 50 100 50 100
-
1-GeV p + 208Pb
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
150 175 200 150 175 200 150 175 200
-
1-GeV p + 238U
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
10-2
10-1
1
125 150 125 150 125 150
-
1-GeV p + 238U
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
1
10
10 2
150 200 150 200 150 200
-
1.2-GeV p + 208Pb
1200 MeV p + pb208, n spectra
10-14
10-13
10-12
10-11
10-10
10-9
10-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 2
10 3
1 10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
-
1.2-GeV p + 181Ta (high energy)
1200 MeV p + ta181, n spectra
10-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 2
1 10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
1200 MeV p + ta181, p spectra
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 2
10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
-
1.2-GeV p + 181Ta (high energy)
1200 MeV p + ta181, n spectra
10-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 2
1 10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
1200 MeV p + ta181, p spectra
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 2
10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
-
1.2-GeV p + 181Ta (high energy)1200 MeV p + ta181, d spectra
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
1200 MeV p + ta181, t spectra
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
-
1.2-GeV p + 181Ta (high energy)
1200 MeV p + ta181, d spectra
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
1200 MeV p + ta181, t spectra
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
-
1.2-GeV p + 181Ta (high energy)
1200 MeV p + ta181, He3 spectra
10-7
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
1200 MeV p + ta181, a spectra
10-6
10-5
10-4
10-3
10-2
10-1
1
10
10 2
10 102
103
Energy (MeV)
d2 σ
/dΩ
dE
(m
b/s
r/M
eV)
INCL45-SMM
INCL45-GEMINI++
Physical ingredientsCascade stageDe-excitation stage
ResultsResidue cross sectionsNeutron spectraLight clusters
ConclusionsAppendix