Workshop for young scientists with research interests focused on physics at FAIR

Antibaryon-nucleus bound states J. Hrtankova, J. Mares Nuclear Physics Institute, 250 68 Rez, Czech Republic The study of the antibaryon-nucleus interaction is an interesting issue as it provides valuable information about the behavior of the antibaryon ($\overline{B}$) in nuclear medium, the in-medium $\overline{B}N$ interaction as well as nuclear dynamics. The possibility of the existence of $\overline{B}$-nucleus bound states - and antiproton states in particular - has attracted much interest in recent years in view of future activities at FAIR [1-5]. This contribution reports on our recent calculations of $\overline{p}$ and $\overline{Y}$ ($Y=$\Lambda$,$\Sigma$,and$\Xi$)boundstatesinselectednuclei,performedwithintherelativisticmean-field(RMF)approach.First,theG-paritymotivatedantibaryon-mesoncouplingconstantswereemployedandpossibledeviationsfromtheG-parityvaluesweretakenintoaccountbyintroducingascalingfactor[2].VariousRMFmodelswereused,includingamodelwithdensity-dependentcouplings,inordertostudymodeldependenceoftheextrapolationofequationofstatetohigherdensities.Ourcalculationsconfirmedlargepolarizationeffectsofthenuclearcorecausedbythepresenceoftheantibaryonandrevealedsignificanteffectofthe$\bar{B}$self-interactionwhichwasnotconsideredinpreviousRMFcalculations.Next,wefocusedonthecalculationsof$\bar{p}$nuclearboundstatesusingapotentialconsistentwith$\bar{p}$-atomicdata[5].Theimaginarypartofthephenomenologicalopticalpotentialwasintroducedtodescribeabsorptionofthe$\bar{p}$inthenuclearmediumandallrelevantdecaychannelswereincluded.Thereductionofthephasespacefortheannihilationproductsfordeeplybound$\bar{p}$stateswastakenintoaccountwhiletreatingfullyself-consistentlyenergyanddensitydependenciesofthecorrespondingsuppressionfactors.Asaresult,the$\bar{p}$ absorption widths significantly decrease when the phase space suppression is considered. References: [1] T.J. Bürvenich, I.N. Mishustin, L.M. Satarov, J.A. Maruhn, H. Stöcker, W. Greiner, Phys. Lett. B 542 (2002) 261. [2] I.N. Mishustin, L.M. Satarov, T.J. Bürvenich, H. Stöcker, W. Greiner, Phys. Rev. C 71 (2005) 035201. [3] A.B. Larionov, I.N. Mishustin, L.M Satarov, W. Greiner, Phys. Rev. C 78 (2008) 014604. [4] T. Gaitanos, M. Kaskulov, H. Lenske, Phys. Lett. B 703 (2011) 193. [5] J. Pochodzalla, Phys. Lett. B 669 (2008) 306. [6] E. Friedman, A. Gal, J. Mares, Nucl. Phys. A 761 (2005) 283.