1. New capabilities in the INCL intranuclear cascade model.
DPhN
(Nuclear Science Department)
Production of strange particles and hypernuclei in nuclear reactions at a few GeV.
New capabilities in the INCL intranuclear cascade model.
Jean-Christophe David
The 13th International Conference on Hypernuclear and Strange Particle Physics
June 24-29, 2018 – Portsmouth (USA)

2. New capabilities in the INCL intranuclear cascade model.
Introduction
Production of strange particles and hypernuclei in nuclear reactions at a few GeV.
New capabilities in the INCL intranuclear cascade model.
So-called spallation reactions
Reaction between
a light projectile and a nucleus
Divided in 2 steps
an intranuclear cascade
de-excitation of a hot nucleus
Production of strange particles and hypernuclei in INCL

3. New capabilities in the INCL intranuclear cascade model.
Introduction
Production of strange particles and hypernuclei in nuclear reactions at a few GeV.
New capabilities in the INCL intranuclear cascade model.
INCL treats the first step
 ~2010: up to 2-3 GeV
2011: up to ~15 GeV (multipions)
Combined to Abla for the de-excitation
Production of strange particles and hypernuclei in INCL

4. New capabilities in the INCL intranuclear cascade model.
Introduction
Production of strange particles and hypernuclei in nuclear reactions at a few GeV.
New capabilities in the INCL intranuclear cascade model.
INCL treats the first step
 ~2010: up to 2-3 GeV
2011: up to ~15 GeV (multipions)
2018: K, L, S added
improved high energies
open new possibilities
strange particle emission
hypernucleus production
Combined to Abla for the de-excitation
L evaporation + Hyperfission added
Production of strange particles and hypernuclei in INCL

5. New capabilities in the INCL intranuclear cascade model.
Introduction
Production of strange particles and hypernuclei in nuclear reactions at a few GeV.
New capabilities in the INCL intranuclear cascade model.
INCL treats the first step
 ~2010: up to 2-3 GeV
2011: up to ~15 GeV (multipions)
2018: K, L, S added
improved high energies
open new possibilities
strange particle emission
hypernucleus production
Combined to Abla for the de-excitation
L evaporation + Hyperfission added
With
A renewal interest of hypernucleus studies
INCL/Abla in Geant4
Production of strange particles and hypernuclei in INCL

6. Production of strange particles and hypernuclei in INCL
Plan
Ingredients of the models
Results
K production
L production
Hypernucleus production
Production of strange particles and hypernuclei in INCL

7. Production of strange particles and hypernuclei in INCL
Ingredients
sreaction(prod./scatt./abs.) From exp. data, symmetries, models, hypotheses
(E, Q) output particles From exp. data, or isotropy, or phase-space
Nuclear Potential L:-28 / S:16 / K+:25 / K-:-60 / K0:15 / K0:-50 MeV
Decay Not in the nucleus, except S0 I N C L
Production of strange particles and hypernuclei in INCL

8. Ingredients
sreaction(prod./scatt./abs.) From exp. data, symmetries, models, hypotheses
(E, Q) output particles From exp. data, or isotropy, or phase-space
Nuclear Potential L:-28 / S:16 / K+:25 / K-:-60 / K0:15 / K0:-50 MeV
Decay Not in the nucleus, except S0 I N C L
No resonances!
Only final states (decay products) are taken into account
All details in J. Hirtz et al., submitted to EPJ+
And a study about VL(A) in J.L. Rodriguez-Sanchez et al., submitted as Rapid Communication in PRC
Production of strange particles and hypernuclei in INCL

9. Production of strange particles and hypernuclei in INCL
Ingredients
Difficulty finding elementary cross sections!
1st set (382 channels)
17%, from experiments
18%, using isospin symmetry at initial/final states
37%, using isospin symmetry at intermediate steps
(Feynman diagrams)
28%, from models and hypotheses
100%
2nd set
from models and hypotheses
Production of strange particles and hypernuclei in INCL

10. Production of strange particles and hypernuclei in INCL
Results
Production of strange particles and hypernuclei in INCL

11. Production of strange particles and hypernuclei in INCL
Results
Kaon - Hyperon
Production of strange particles and hypernuclei in INCL

12. Production of strange particles and hypernuclei in INCL
Results – K+ production
Production of strange particles and hypernuclei in INCL

13. Production of strange particles and hypernuclei in INCL
Results – K+ production
KAOS - W. Scheinast et al., PRL 96, (2006)
Production of strange particles and hypernuclei in INCL

14. Production of strange particles and hypernuclei in INCL
Results – K- production
KAOS - W. Scheinast et al., PRL 96, (2006)
Production of strange particles and hypernuclei in INCL

15. Production of strange particles and hypernuclei in INCL
Results – K+ production
LBL - S. Schnetzer et al., Phys. Rev. C 40, 640(1989)
Production of strange particles and hypernuclei in INCL

16. Production of strange particles and hypernuclei in INCL
Results – K+ production
LBL - S. Schnetzer et al., Phys. Rev. C 40, 640(1989)
Production of strange particles and hypernuclei in INCL

17. Production of strange particles and hypernuclei in INCL
Results – K+ production
LBL - S. Schnetzer et al., Phys. Rev. C 40, 640(1989)
Production of strange particles and hypernuclei in INCL

18. Production of strange particles and hypernuclei in INCL
Results – K+ production
LBL - S. Schnetzer et al., Phys. Rev. C 40, 640(1989)
Production of strange particles and hypernuclei in INCL

19. Production of strange particles and hypernuclei in INCL
Results – K+ production
Forward direction
M. Büscher et al., Eur. Phys. J. A 22, (2004)
Thanks Nikolai Mokhov for LAQGSM data
Production of strange particles and hypernuclei in INCL

20. Production of strange particles and hypernuclei in INCL
Results – K+ production – High energy
E-802 Collaboration Phys. Rev. D 45, 3906 (1992)
Production of strange particles and hypernuclei in INCL

21. Production of strange particles and hypernuclei in INCL
Results – K0s production
INCL overestimates, but a part explained by…
C.-M. Herbach et al.,
NIMA 562 (2006) 729–732
sR(p+Nb – 1.2 GeV):
1063+/-40 mb
HADES Collaboration, T.Gaitanos and J. Weil,
Phys. Rev. C 90, (2014)
Production of strange particles and hypernuclei in INCL

22. Production of strange particles and hypernuclei in INCL
Results – L production
HADES Collaboration, Eur. Phys. J. A (2014) 50:81
Production of strange particles and hypernuclei in INCL

23. Production of strange particles and hypernuclei in INCL
Efficiency
UrQMD simulation
HADES
result
Geant4 simulation
HADES
measurement
Production of strange particles and hypernuclei in INCL

24. Production of strange particles and hypernuclei in INCL
Results – L production
(efficiency included)
« Momentum content » beyond ~y=0.8 different from one model to another (UrQMD, GiBUU, INCL)
Extrapolation in the «blind» zone difficult (model dependent)
Production of strange particles and hypernuclei in INCL

25. Production of strange particles and hypernuclei in INCL
Results
Hypernuclei
Production of strange particles and hypernuclei in INCL

26. Production of strange particles and hypernuclei in INCL
Results - Hypernuclei
Production of strange particles and hypernuclei in INCL

27. Production of strange particles and hypernuclei in INCL
Results - Hypernuclei
Production of strange particles and hypernuclei in INCL

28. Production of strange particles and hypernuclei in INCL
Conclusions
Strangeness implemented in INCL (and Abla) … and INCL/Abla in Geant4 
Ingredients not always well known…
...However, results quite good compared to exp. data or other models
K+ production: OK in momenta and angles
At forward emission angle data are missing
Role of DN-induced channels
. important at low Ep
. improvement of elementary s needed
K- production: Some key channels seem missing in INCL
K0 production: A possible slight overestimation, but exp. data needed
L production: Exp. data are too scarce to conclude, but encouraging
Hypernucleus: Good results but too scarce data
Future
Improvements...
X added ?
New projectiles (e-, p) ?
Production of strange particles and hypernuclei in INCL

29. Jose Luis Rodriguez Sanchez (Post-Doc) Abla
Collaborators
Jason Hirtz (PhD) INCL
Jose Luis Rodriguez Sanchez (Post-Doc) Abla
Alain Boudard, Joseph Cugnon, Sylvie Leray, Davide Mancusi, Georg Schnabel

30. Production of strange particles and hypernuclei in INCL
Thank you!
Production of strange particles and hypernuclei in INCL