T. Gaitanos, H. Lenske, U. Mosel

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Presentation transcript:

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, p+X)@SIS Benchmark tests (fragmentation) Applications-II: X+X@2AGeV (HypHI), p+X@50GeV (PANDA, J-PARC) Predictions on hypernuclear production cross sections Final remarks

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

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

Theoretical aspects… (http://gibuu.physik.uni-giessen.de/GiBUU) Initial non-equilibrium stage (http://gibuu.physik.uni-giessen.de/GiBUU) 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

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)

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:0811.3506)

absolute yields from spectator fragmentation in Au+Au@0.6AGeV Applications-II: Fragmentation in X+X reactions absolute yields from spectator fragmentation in Au+Au@0.6AGeV (ALADIN-data) fragment velocity spectra in Xe+Pb@1.0AGeV data: Henzlova, PRC78, 044616

Applications-II: Hypernuclei in spectator fragmentation… (HypHI, 12C+12C@2AGeV) First transport theoretical predictions: total yields ~mb Consistent with previous studies: M.Wakai, NPA547(92)89c Prog. Part. Nucl. Phys. (2009), in press (arXiv:0811.3506) Phys. Lett. B (2008), submitted

Two sources (residual target+moving source) Applications-II: Hypernuclei from high energy proton-induced reactions… (PANDA/J-PARC, p+12C@50GeV) Two sources (residual target+moving source) Most of hyperons created & rescatter inside moving source Prog. Part. Nucl. Phys. (2009), in press (arXiv:0811.3506), Phys. Lett. B (2008), submitted

Theoretical activities: “FAIR” @ Giessen Conclusions… Theoretical activities: “FAIR” @ 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: FAIR @ GSI  HypHI (T. Saito)  Li (C) +C@2AGeV starts soon…  PANDA  exp. predictions on double strange hypernuclei

Backup slides

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

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

Mean-field vs cascade – the role of the mean-field… (PANDA/J-PARC, p+12C@50GeV) central peripheral

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