particles and hypernuclei in nuclear reactions at a few GeV New capabilities in the INCL intranuclear cascade model JeanChristophe David DPhN Nuclear Science Department ID: 742145
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Slide1
Production of strange particles and hypernuclei in nuclear reactions at a few GeV.New capabilities in the INCL intranuclear cascade model.
Jean-Christophe David
DPhN(Nuclear Science Department)
The 13
th
International Conference on Hypernuclear and Strange Particle PhysicsJune 24-29, 2018 – Portsmouth (USA)Slide2
IntroductionProduction of strange particles and hypernuclei in INCLProduction 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 nucleusSlide3
IntroductionProduction of strange particles and hypernuclei in INCLProduction 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-excitationSlide4
IntroductionProduction of strange particles and hypernuclei in INCLProduction 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
addedSlide5
IntroductionProduction of strange particles and hypernuclei in INCLProduction 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 Geant4Slide6
PlanProduction of strange particles and hypernuclei in INCLIngredients of the models
ResultsK production
L productionHypernucleus productionSlide7
IngredientsProduction of strange particles and hypernuclei in INCLIN
CL
sreaction(prod./scatt./abs.) From exp. data, symmetries, models, hypotheses
(E,
Q) output particles From
exp. data, or isotropy, or phase-spaceNuclear Potential L:-28 / S:16 / K+:25 / K
-
:-60 / K
0
:15 / K
0
:-50 MeV
Decay
Not in the nucleus,
except
S
0Slide8
IngredientsProduction of strange particles and hypernuclei in INCLIN
CL
sreaction(prod./scatt./abs.) From exp. data, symmetries, models, hypotheses
(E,
Q) output particles From
exp. data, or isotropy, or phase-spaceNuclear Potential L:-28 / S:16 / K+:25 / K
-
:-60 / K
0
:15 / K
0
:-50 MeV
Decay
Not in the nucleus,
except
S
0
No
resonances
!
Only
final states (
decay
products
) are
taken
into
accountAll details
in J. Hirtz et al.,
submitted
to EPJ+
And a
study
about V
L
(A)
in J.L. Rodriguez-Sanchez et al.,
submitted
as Rapid Communication in PRCSlide9
Production of strange particles and hypernuclei in INCLDifficulty finding elementary cross sections!1
st 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%
2
nd
set
from
models
and
hypotheses
IngredientsSlide10
Results Production of strange particles and hypernuclei in INCLSlide11
Results Production of strange particles and hypernuclei in INCLKaon - HyperonSlide12
Production of strange particles and hypernuclei in INCLResults – K+
productionSlide13
Production of strange particles and hypernuclei in INCLKAOS - W. Scheinast et al., PRL 96, 072301 (2006)
Results – K+ productionSlide14
Production of strange particles and hypernuclei in INCLKAOS - W. Scheinast et al., PRL 96, 072301 (2006)Results – K-
productionSlide15
Production of strange particles and hypernuclei in INCLLBL - S. Schnetzer et al., Phys. Rev. C 40, 640(1989)Results – K
+ productionSlide16
Production of strange particles and hypernuclei in INCLLBL - S. Schnetzer et al., Phys. Rev. C 40, 640(1989)Results – K
+ productionSlide17
Production of strange particles and hypernuclei in INCLLBL - S. Schnetzer et al., Phys. Rev. C 40, 640(1989)Results – K
+ productionSlide18
Production of strange particles and hypernuclei in INCLLBL - S. Schnetzer et al., Phys. Rev. C 40, 640(1989)Results – K
+ productionSlide19
Production of strange particles and hypernuclei in INCLM. Büscher et al., Eur. Phys. J. A 22, 301-317(2004)Thanks Nikolai Mokhov for LAQGSM data
Results – K+ production
Forward
directionSlide20
Production of strange particles and hypernuclei in INCLResults – K+ production – High energy
E-802 Collaboration Phys
. Rev. D 45, 3906 (1992)Slide21
Production of strange particles and hypernuclei in INCLHADES Collaboration, T.Gaitanos and J. Weil,Phys. Rev. C 90, 054906 (2014)Results – K
0s production
INCL
overestimates
, but a part
explained by…C.-M. Herbach et al.,NIMA 562 (2006) 729–732
s
R
(
p+Nb
– 1.2
GeV
):
1063+/-40 mbSlide22
Production of strange particles and hypernuclei in INCLResults – L production
HADES Collaboration, Eur
. Phys. J. A (2014) 50:81Slide23
HADESmeasurementGeant4 simulationUrQMD simulationHADES
result
Efficiency
Production of
strange
particles
and
hypernuclei
in INCLSlide24
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
)Slide25
ResultsProduction of strange particles and hypernuclei in INCLHypernucleiSlide26
Results - HypernucleiProduction of strange particles and hypernuclei in INCLSlide27
Results - HypernucleiProduction of strange particles and hypernuclei in INCLSlide28
ConclusionsProduction of strange particles and hypernuclei in INCL 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 modelsK+ 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 INCLK0 production: A possible slight overestimation, but exp. data neededL production: Exp. data are too scarce to conclude, but encouragingHypernucleus: Good results but too scarce data
Future
Improvements...
X
added ?
New projectiles (e
-
, p) ?Slide29
CollaboratorsJason Hirtz (PhD) INCLJose Luis Rodriguez Sanchez (Post-Doc) AblaAlain Boudard, Joseph Cugnon, Sylvie Leray, Davide Mancusi, Georg SchnabelSlide30
Thank you!Production of strange particles and hypernuclei in INCL