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1、NuclearTransparencyinHeavyIonCollisionsat14.6GeV/nucleonH.M.Ding1,P.Gl¨assel,J.H¨ufner2Fakult¨atf¨urPhysikundAstronomie,Universit¨atHeidelberg,GermanysubmittedtoNuclearPhysicsAAbstractTheprobabilityofaprojectilenucleontotraverseatargetnucleuswithoutinter-actioniscalcu
2、latedforcentralSi-PbcollisionsandcomparedtothedataofE814.Thecalculationsareperformedintwoindependentways,viaGlaubertheoryandusingthetransportcodeUrQMD.ForcentralcollisionsGlauberpredictionsareabout30to50%higherthanexperiment,whiletheoutputofUrQMDdoesnotshowtheexperime
3、ntalpeakofbeamrapidityparticles.PACSnumber:25.75.-qKeywords:NuclearTransparency;WoundedNucleonThedynamicsofaheavyioncollisionisacomplicatedmany-bodyproblem.arXiv:nucl-th/0008002v11Aug2000Itisthetaskofappropriatelydesignedexperimentstoisolateoneparticu-laraspectofthedy
4、namicsandelucidateitsphysics.Woundednucleonsareoneoftheopenproblems.Inaheavyioncollisionanucleonmayundergoasequenceofcollisions,whichfollowsorapidlyoneafteranother,thatthenucleonisnomoreinitsgroundstate,evennotnecessarilyinanydefiniteexcitedbaryonicresonance(like∆orN∗)
5、.Wewillspeakofawoundednu-cleon.InanextencounterwithanothernucleonthiswoundednucleonwillnotinteractwiththefreespaceNNcrosssectionσNNbutwithaneffectiveinoneσeff.Isitpossibletodetermineσefffromexperiment?1OnleaveofabsencefromDepartmentofPhysics,JilinUniversity,Changchun,Ch
6、ina.2CorrespondingAddress:Institutf¨urTheoretischePhysik,Universit¨atHeidel-berg,Philosophenweg19,D-69120Heidelberg,Germany.Tel:06221-549440;Fax:06221-549331;Email:Joerg.Huefner@urz.uni-heidelberg.de.PreprintsubmittedtoElsevierPreprint8February2008TheE814collaboration
7、hasdesignedanexperimentwhichmayanswerthisquestion[1].Attheenergyof14.6GeV/nucleon,theprojectile28SicollideswithAl,CuandPbandthebeamrapiditynucleonsarestudiedasafunc-tionofthecentralityofthereaction(controlledbyameasurementofthetransverseenergy).Thebeam-rapiditynucleon
8、sbelongtotheprojectileandhavenotlostanyenergyinthereaction.Ofcourse,inaperipheralreactiononealwayshasthesocalledspectatornuc