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内容Fermi-gaslevel-densityexpressionTheleveldensityparameteraisparametrizedas:1.Evaporationprocess:evaporationspectra2.Fissionprocess:crosssections,particleyieldsExperimentalobservationofenhancedemissionoflightparticlespriortofission(withrespecttopredictionsfromstandardstatisticalmodels)withincreasingexcitationenergyinfusion-fissionreactions.Thisisduetodissipationeffects.ThedrivingforceoftheLangevinequationiscalculatedfromtheentropy:E*isthetotalinternalenergyofthesystem,V(q)ispotentialenergy.deformation-dependentleveldensityparametera(q)=a1A+a2A2/3Bs(q)whereBs(q)isthedimensionlesssurfacearea(forasphereBs=1).Itisusedtocalculateaf/an.af/anchangeswithfissilityW.Ye,PRC81(2010)011603(R)relativisticheavy-ioncollisionsvs.fusionreactionsCN:(highE*,lowL)vs.(lowE*,highL)●spindistributionofevaporationresiduecrosssectionsER(L)W.Ye,NPA853(2011)61●prescissionparticleyieldsroleofspin:af/an(L)Scalinganalysisoffissionprobabilityofsystems200Tl(rightfigure)and201Tl(leftfigure)basedonthestandardstatisticalmodel16O+181Ta197TlRecentworkonexcitation-energydependentaf/an(E*)anditseffectsonthedecayofhotnucleipictureoffissionprocessChoosespallationreactionsinducedbyhighenergyprotonsmaincharacteristics:●thethermalexcitationenergyoftheproducedexcitednucleiinspallationcanreach1GeV●significantlyreducesideeffectsfromcompression,deformationandhighspins.Thesedistortionscomplicatethedescriptionofde-excitationprocessofexcitednuclearsystemsW.Ye,PRC85(2012)011601(R)●ThesensitivityofE*sctonuclearfrictiondependsontheaf/an(E*).●Experimentally,toprobeinformationofaf/an(E*),populatingheavysystemswithspallationreactionscansignificantlylowersideeffectsassociatedwithangularmomentum,deformation,etc.●Applicationstospallation-inducedreactionsandthedecayofsuperheavynuclei.W.Ye,HighEnergyPhys.Nucl.Phys.26(2000)52
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