1. T. Gaitanos, H. Lenske, U. Mosel
Formation of hypernuclei in reactions induced by heavy-ion and hadron beams
T. Gaitanos, H. Lenske, U. Mosel
Introduction
Theoretical aspects
Giessen-BUU (GiBUU) +SMM approach
Applications-I: (X+X,
Benchmark tests (fragmentation)
Applications-II: (HypHI), (PANDA, J-PARC)
Predictions on hypernuclear production cross sections
Final remarks

2. Introduction… Z N * Explore YB- & YY-interaction
HypHI: Hyperon Heavy-Ion
Antiproton-proton Annihilation in Darmstadt
* Explore YB- & YY-interaction
NuSTAR: Nuclear Structure, Astrophysics, Reactions N Z
Nuclear structure at the limits

3. Relativistic hypernuclei…K
L,S,p,K,...
Production of hypernuclei in relativistic HIC
Production of many hyperons from BB->BYK (3-body PS)
Secondary rescattering (pNYK)
Multiple coalescence of hyperons with fragments
Theoretical framework
Phase-Space evolution Transport approaches (INC,BUU,RBUU,CBUU,(Ur)QMD,HSD,…)
Description of fragment formation Statistical picture (SMM, Botvina & Mishustin)
Description of hypernuclei formation?
Phase-Space coalescence in coordinate and in momentum space

4. Theoretical aspects… (http://gibuu.physik.uni-giessen.de/GiBUU)
Initial non-equilibrium stage (
Asymptotic equilibrated stage
Statistical Multifragmentation Model (SMM)
Fission/spallation, evaporation, multifragmentation… (with increasing excitation)
Statistical determination of partial decay widths  Monte-Carlo method E*
Ai,Zi
E*-e
Ad,Zd
j,e Ai
Ad+n
SMM code: Botvina & Mishustin, PR257(´95) 133

5. Application-I: Fragmentation in p+X@0.8 GeV (global aspects…)
Charge distribution…
Mass distribution…
Exp. data:
Benlliure et al., Nucl. Phys. A683 (2001) 513.
Rejmund et al., Nucl. Phys. A683 (2001) 540
Phys. Lett. B 663, 197 (2008)

6. Application-I: Fragmentation in p+X@0.8 GeV (energy spectra…)
Pre-Equilibrium (GiBUU): high-energy n-emission, QE-peak
Asymptotic final state (SMM): Statistical decay of excited source
Final Result: Hybrid GiBUU+SMM
neutrons
data: S. Leray et al., PRC65,044621
Prog. Part. Nucl. Phys. (2009), in press (arXiv: )

7. absolute yields from spectator fragmentation in Au+Au@0.6AGeV
Applications-II: Fragmentation in X+X reactions
absolute yields from spectator fragmentation in
(ALADIN-data)
fragment velocity spectra in
data:
Henzlova, PRC78,

8. Applications-II: Hypernuclei in spectator fragmentation…
(HypHI,
First transport theoretical predictions: total yields ~mb
Consistent with previous studies: M.Wakai, NPA547(92)89c
Prog. Part. Nucl. Phys. (2009), in press (arXiv: )
Phys. Lett. B (2008), submitted

9. Two sources (residual target+moving source)
Applications-II: Hypernuclei from high energy proton-induced reactions…
(PANDA/J-PARC,
Two sources (residual target+moving source)
Most of hyperons created & rescatter inside moving source
Prog. Part. Nucl. Phys. (2009), in press (arXiv: ), Phys. Lett. B (2008), submitted

10. Theoretical activities: “FAIR” @ Giessen
Conclusions…
Theoretical activities: Giessen
 GiBUU+SMM: NE-dynamics + statistical process of fragmentation
 GiBUU+SMM+L: model extension to hypernuclei (coalescence)
Theoretical predictions (low energy)
 proper description of fragmentation process in spallation reactions
and in heavy-ion collisions
First theoretical predictions on hypernuclei (high energy)
 s ~ mb for LH & LHe in spectator fragmentation in heavy-ion collisions
 high energy LH & LHe in proton-induced reactions
Important for future experiments: GSI
 HypHI (T. Saito)  Li (C) starts soon…
 PANDA  exp. predictions on double strange hypernuclei

11. Backup slides

12. Getting started: Spectator fragmentation at Au+Au@0.6 GeV
Prog. Part. Nucl. Phys. (2009), in press
Phys. Lett. B (2008), submitted

13. New initialization: Binding energy & rms-radius in BUU…
Old initialization
RTF-binding energy
new initialization

14. Mean-field vs cascade – the role of the mean-field…
(PANDA/J-PARC,
central
peripheral

15. Ground state in BUU-II: Results (application to proton-induced reactions)