Bochum, 18.03.09

Formation of hypernuclei in reactions induced Formation of hypernuclei in reactions induced

by heavy-ion and hadron beams by heavy-ion and hadron beams

T. Gaitanos, H. Lenske, U. MoselT. Gaitanos, H. Lenske, U. Mosel

IntroductionIntroduction

Theoretical aspectsTheoretical aspectsGiessen-BUU (GiBUU) +SMM approach

Applications-I: (X+X, p+X)@SISApplications-I: (X+X, p+X)@SISBenchmark tests (fragmentation)Applications-II: X+X@2AGeV (HypHI), p+X@50GeV (PANDA, J-PARC)Predictions on hypernuclear production cross sections

Final remarksFinal remarks

Bochum, 18.03.09

Introduction…Introduction…Introduction…Introduction…

NuSTAR: NuSTAR: NuNuclear clear StStructure, ructure, AAstrophysics, strophysics, RReactionseactions

N

Z

Nuclear structure at the limitsNuclear structure at the limits

HypHI: HypHI: HypHyperon eron HHeavy-eavy-IIonon

AntiAntipproton-proton roton-proton AnAnnihilation in nihilation in DaDarmstadtrmstadt

* Explore YB- & YY-* Explore YB- & YY-interactioninteraction

Bochum, 18.03.09

Relativistic hypernuclei…Relativistic hypernuclei…

Production of hypernuclei in relativistic HICProduction of hypernuclei in relativistic HICProduction of many hyperons from BB->BYK (3-body PS)

Secondary rescattering (NYK)Multiple coalescence of hyperons with fragments

Theoretical frameworkTheoretical framework

Phase-Space evolution Phase-Space evolution Transport approaches (INC,BUU,RBUU,CBUU,(Ur)QMD,HSD,…)

Description of fragment formation Description of fragment formation Statistical picture (SMM, Botvina & Mishustin)

Description of hypernuclei formation?Description of hypernuclei formation?Phase-Space coalescence in coordinate and in momentum space

Bochum, 18.03.09

Theoretical aspects…Theoretical aspects…Theoretical aspects…Theoretical aspects…

Initial non-equilibrium stageInitial non-equilibrium stageInitial non-equilibrium stageInitial non-equilibrium stage

Asymptotic equilibrated stageAsymptotic equilibrated stage

Statistical Multifragmentation Model (SMM)

Fission/spallation, evaporation, multifragmentation… (with increasing excitation)

Statistical determination of partial decay widths Monte-Carlo method

Asymptotic equilibrated stageAsymptotic 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*

Ai,Zi

E*-

Ad,Zd

E*-

Ad,Zd

j,j,

AiAi Ad+nAd+n

(http://gibuu.physik.uni-giessen.de/GiBUU)(http://gibuu.physik.uni-giessen.de/GiBUU)(http://gibuu.physik.uni-giessen.de/GiBUU)(http://gibuu.physik.uni-giessen.de/GiBUU)

SMM code: Botvina & Mishustin, PR257(´95) 133SMM code: Botvina & Mishustin, PR257(´95) 133SMM code: Botvina & Mishustin, PR257(´95) 133SMM code: Botvina & Mishustin, PR257(´95) 133

Bochum, 18.03.09

Application-I: Fragmentation in p+X@0.8 GeV Application-I: Fragmentation in p+X@0.8 GeV (global (global aspects…)aspects…)Application-I: Fragmentation in p+X@0.8 GeV Application-I: Fragmentation in p+X@0.8 GeV (global (global aspects…)aspects…)

Charge distribution…Charge distribution…

Mass distribution…

Mass distribution…

Phys. Lett. B Phys. Lett. B 663663, 197 , 197 (2008)(2008)

Exp. data:Exp. data:Benlliure et al., Nucl. Phys. A683 (2001) 513.Rejmund et al., Nucl. Phys. A683 (2001) 540

Exp. data:Exp. data:Benlliure et al., Nucl. Phys. A683 (2001) 513.Rejmund et al., Nucl. Phys. A683 (2001) 540

Bochum, 18.03.09

Pre-Equilibrium (GiBUU): high-energy n-emission, QE-peakPre-Equilibrium (GiBUU): high-energy n-emission, QE-peak

Asymptotic final state (SMM): Statistical decay of excited sourceAsymptotic final state (SMM): Statistical decay of excited source

Final Result: Hybrid GiBUU+SMMFinal Result: Hybrid GiBUU+SMMFinal Result: Hybrid GiBUU+SMMFinal Result: Hybrid GiBUU+SMM

data: S. Leray et al., PRC65,044621 data: S. Leray et al., PRC65,044621

neutronsneutrons

Application-I: Fragmentation in p+X@0.8 GeV Application-I: Fragmentation in p+X@0.8 GeV (energy (energy spectra…)spectra…)Application-I: Fragmentation in p+X@0.8 GeV Application-I: Fragmentation in p+X@0.8 GeV (energy (energy spectra…)spectra…)

Prog. Part. Nucl. Phys. (2009), in pressProg. Part. Nucl. Phys. (2009), in press (arXiv:0811.3506)(arXiv:0811.3506)

Bochum, 18.03.09

Applications-II: Fragmentation in X+X reactionsApplications-II: Fragmentation in X+X reactionsApplications-II: Fragmentation in X+X reactionsApplications-II: Fragmentation in X+X reactions

absolute yieldsabsolute yields from spectator fragmentation

in Au+Au@0.6AGeV

(ALADIN-data)

absolute yieldsabsolute yields from spectator fragmentation

in Au+Au@0.6AGeV

(ALADIN-data)

fragment velocity spectrafragment velocity spectra

in Xe+Pb@1.0AGeV

data:

Henzlova, PRC78, 044616

fragment velocity spectrafragment velocity spectra

in Xe+Pb@1.0AGeV

data:

Henzlova, PRC78, 044616

Bochum, 18.03.09

Applications-II: Hypernuclei in spectator fragmentation…Applications-II: Hypernuclei in spectator fragmentation…(HypHI, (HypHI, 1212C+C+1212C@2AGeV)C@2AGeV)

Applications-II: Hypernuclei in spectator fragmentation…Applications-II: Hypernuclei in spectator fragmentation…(HypHI, (HypHI, 1212C+C+1212C@2AGeV)C@2AGeV)

First transport theoretical predictions: total yields ~b

Consistent with previous studies: M.Wakai, NPA547(92)89cM.Wakai, NPA547(92)89c

First transport theoretical predictions: total yields ~b

Consistent with previous studies: M.Wakai, NPA547(92)89cM.Wakai, NPA547(92)89c

Prog. Part. Nucl. Phys. (2009), in press Prog. Part. Nucl. Phys. (2009), in press (arXiv:0811.3506)(arXiv:0811.3506)

Phys. Lett. B (2008), submittedPhys. Lett. B (2008), submitted

Bochum, 18.03.09

Applications-II: Hypernuclei from high energy proton-induced Applications-II: Hypernuclei from high energy proton-induced reactions…reactions…

(PANDA/J-PARC, p+(PANDA/J-PARC, p+1212C@50GeV)C@50GeV)

Applications-II: Hypernuclei from high energy proton-induced Applications-II: Hypernuclei from high energy proton-induced reactions…reactions…

(PANDA/J-PARC, p+(PANDA/J-PARC, p+1212C@50GeV)C@50GeV)

Two sources (residual target+moving source)

Most of hyperons created & rescatter inside moving source

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), Prog. Part. Nucl. Phys. (2009), in press (arXiv:0811.3506), Phys. Lett. B (2008), submittedsubmitted

Bochum, 18.03.09

Conclusions…Conclusions…

Theoretical activities: “FAIR” @ GiessenTheoretical activities: “FAIR” @ Giessen GiBUU+SMM: NE-dynamics + statistical process of fragmentationGiBUU+SMM: NE-dynamics + statistical process of fragmentation

GiBUU+SMM+GiBUU+SMM+: model extension to hypernuclei (coalescence): model extension to hypernuclei (coalescence)

Theoretical predictions (low energy)Theoretical predictions (low energy) proper description of fragmentation process in spallation reactions proper description of fragmentation process in spallation reactions

and in heavy-ion collisions and in heavy-ion collisions

First theoretical predictions on hypernuclei (high First theoretical predictions on hypernuclei (high energy)energy) ~ ~ b for b for H & H & HeHe in spectator fragmentation in heavy-ion collisions in spectator fragmentation in heavy-ion collisions

high energy high energy H & H & HeHe in proton-induced reactions in proton-induced reactions

Important for future experiments: FAIR @ GSIImportant for future experiments: FAIR @ GSI HypHI (T. Saito) HypHI (T. Saito) Li (C) +C@2AGeV starts soon… Li (C) +C@2AGeV starts soon…

PANDA PANDA exp. predictions on double strange hypernuclei exp. predictions on double strange hypernuclei

Bochum, 18.03.09

Backup slides

Backup slides

Bochum, 18.03.09

Prog. Part. Nucl. Phys. (2009), in Prog. Part. Nucl. Phys. (2009), in presspress

Phys. Lett. B (2008), submittedPhys. Lett. B (2008), submitted

Getting started: Spectator fragmentation at Au+Au@0.6 GeVGetting started: Spectator fragmentation at Au+Au@0.6 GeVGetting started: Spectator fragmentation at Au+Au@0.6 GeVGetting started: Spectator fragmentation at Au+Au@0.6 GeV

Bochum, 18.03.09

New initialization: Binding energy & rms-radius in BUU…New initialization: Binding energy & rms-radius in BUU…New initialization: Binding energy & rms-radius in BUU…New initialization: Binding energy & rms-radius in BUU…

Old initialization

Old initialization

new initialization

new initialization

RTF-binding energy

Bochum, 18.03.09

Mean-field vs cascade – the role of the mean-field…Mean-field vs cascade – the role of the mean-field…

(PANDA/J-PARC, p+(PANDA/J-PARC, p+1212C@50GeV)C@50GeV)

Mean-field vs cascade – the role of the mean-field…Mean-field vs cascade – the role of the mean-field…

(PANDA/J-PARC, p+(PANDA/J-PARC, p+1212C@50GeV)C@50GeV)

centralcentral

peripheralperipheral

Bochum, 18.03.09

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