2730.中能豐中子碰撞下π介子集體流的研究

1、編號(hào)：碩士學(xué)位論文碩士學(xué)位論文題目：中能豐中子碰撞下π介子集體流的研究培養(yǎng)單位：物理科學(xué)與技術(shù)學(xué)院專(zhuān)業(yè)名稱(chēng)：理論物理指導(dǎo)教師：劉玲副教授李慶峰教授研究生：鄒麗艷完成時(shí)間：2017年3月15日沈陽(yáng)師范大學(xué)研究生處制類(lèi)別全日制研究生√教育碩士同等學(xué)力IIThecollectiveflowofπfromthemediumenergyneutronrichcollisionAbstractNuclearequationofstate(EOS)i

2、nhighdensityregionnotonlyfustostudythestructurepropertiesofnucleibutalsotostudythemassradiusrelationofneutronstarsintheuniverseisveryimptant.EspeciallytheisospinasymmetricnuclearmatterEOSinrecentyearsbecomethefocusofrese

3、archthedensitydependenceofsymmetryenergyisanurgentproblematpresent.Inthepastfalongtimenuclearphysicistshadbeenmademanyattemptsfromthenuclearrelatedphysicalquantitiestoextractinfmationbuthasacompletelyclearimageofthenucle

4、armatterdensitydependenceofsymmetryenergycannotappearsofar.Wecomparethetransptmodelsimulationresultsexperimentaldatatoextractthesymmetryenergyinfmationtherefethetransptmodelplaysaveryimptantroleintheprocessofextractingsy

5、mmetricenergyinfmation.AtthepresentstageTherearemanytransptmodelsusedinthestudythispaperweusedUltrarelativisticquantummoleculardynamics(UrQMD)modelthemodelofthecollisionculvertcover55differentstates32differentmesonsgreat

6、lyexptheresearchfield.Wethroughtheimprovementoftransptmodeltoextractvaluableinfmation.InthiswkfirstlybyconsideringdifferentvaluesofthetimestepfthepotentialupdatesintheUltrarelativisticquantummoleculardynamics(UrQMD)model

7、weexaminetheinfluenceofthetimestepitsinfluenceonobservablessuchastheyieldcollectiveflowofnucleonspionsfromheavyioncollisionsaround1GeVnucleon.Itisfoundthattheseobservablesareaffectedtosomeextentbythechoiceofthetimestepth

8、eimpactofthetimesteponthepionrelatedobservablesismevisiblethanthatonthenucleonrelatedones.Howeveritseffectontheπ?πyieldratioellipticflowdifferencebetweenneutronsprotonswhichhavebeentakenassensitiveobservablesfprobingthed