12714.量子分子動力學模型中的費米約束

1、量子分子動力學模型中的費米約束專業(yè)名稱：申請人：指導教師：理論物理吳彤王寧教授論文答辯委員會主席：委員：菩磙醯雅盟力盟，專L熬一TheFermiconstraintindynamicsquantummolecularmodelTongWuSupervisor：NingWangDepartmentofPhysics，GuangxiNormalUniversity，Guilin541004AbstractThemicroscopicdyna

2、micssimulationsofheavy—ioncollisions(HICs)areimportantnotonlyforthestudyofmulti—fragmentationprocessatintermediateenergiesbutalsoforthestudyoffusionreactionsatenergiesnearCoulombbarrierOneofthehottopicsinNuclearphysicsis

3、todevelopareliablemicroscopicdynamicsmodeltosimu—latetheheavy—ioncollisionsatlowandintermediateenergies，Studydynamicsmecha—nismofreaction，andmakeitclearthatthebestpartnerofprojectile—targetcombinationandincidentenergytos

4、ynthesizethenewneutron—richnuclideAsasemi—classicmicroscopicdynamicstransportmodel，thequantummoleculardynamics(QMD)modeliswodelyusedinthestudyofheavy—ioncollisionByconsid—eringmomentumredistributionviatwobodyelasticscatt

5、eringintheFermiconstraintprocedure，thefermionpropertiesandthestabilityofthemodelcanbeeffectivelyimproved，Butwiththisconstraint，theimprovementonthehighmomentumpartofmomentumdistributionisnotobviousInordertofurtherimprovet

6、hestabilityofthemodel，TheFermiconstraintprocedureismodifiedandthemomentumtransferinthemomentumre—distributionprocessissimultaneouslyconsideredinadditiontOthe’e—lasticscattering’thestabifityoftheinitialnucleiandfragmentsp

7、roducedinheavyioncollisionsCanbefurtherimprovedinthequantummoleculardynamicssimulationsThecaseofthephasespaceoccupationprobabilitylargerthanoneiseffectivelyre—ducedwiththeproposedprocedureSimultaneouslytheenergyconservat

8、ionCanbebeaerdescribedforbothindividualnucleiandheavy—ionreactions，andtheimprove—mentofthefermionpropertiescansignificantlyreducethenumberofspuriousemittednucleonsWiththerevisedversionoftheimprovedquantummoleculardynamic

9、s(ImQMD)modelthefusionexcitationfunctionsof160186Wandthecentralcollisionsof197Au197Auat35AMeVarereexaminedThefusioncrosssectionsatsub—barrierenergiesandthechargedistributionoffragmentsarerelativelybetterreproducedduetOth