LIGHT-HEAVY-ION REACTION DYNAMICS IN MEDIUM MASS NUCLEI: STUDY OF MEDICAL ISOTOPE

Abstract

The adventofupgradedaccelerators,state-of-the-artdetectors,andrelatedtechnolog- ical advancementshaveenabledusexploringadeeperinsightofthewideanddiverse spectrumofnuclearreactionprocessesinthelightandheavy-ioninducedreactions. Tremendouse ortshavebeenmadetodisentanglethefusion- ssion,quasi- ssion, quasi-elastic scattering,multinucleontransferprocesses,thein uenceofbreakup on complete{incompletefusionetc.duringrecentyears.However,thedimensionof knowledgeontheloosely/tightlyboundprojectileinducedreactionsmustbeexpanded in ordertosortoutseveralopenandchallengingquestionssuchasbreakupthreshold anomalies, thee ectofcollectiveexcitationsonfusion,challengetoreachinthesuper- heavyregionaftercompetingwithfusion- ssion,quasi- ssion,fast- ssionprocesses etc. Moreover,experimentalknowledgefromthosestudycouldbeutilizedinappli- cations ofradionuclidesinthedi erent eldsofscience,especiallyinthe ourishing branchofnuclearmedicine,whichisenoughtojustifytheirstudy. In Chapter1,settingthepacewithabriefevolutionofnuclearphysics,wide and diversespectrumofnuclearreactionprocesseshasbeendescribed.Further,the details ofequilibrium-preequilibriumprocesses,complete-incompletefusionreactions are presentedwhichendswithadiscussiononthescopeandobjectivesofthethesis. Chapter 2illustratesthetheoreticalbackgroundofdi erentnuclearreactionmod- els ofcompound,precompoundanddirectreactionsusedforacomparisonwiththe i ii experimentalresultsdiscussedinthethesis. Chapter 3describesthepopulationsofresiduesproducedviaevaporative/non- evaporativeprocessesinthe -induced reactionson 89Y and 93Nb. Thetheoretical excitation functionoftheresiduesarecomparedwithexperimentalobservationswhich revealthedominanceofprecompoundemissionoverthecompoundevaporationsto- wardsthehighenergyregionindi erent xn, pxn and xn channels. Chapter 4containssystematicexperimental/theoreticalinvestigationsof 7Li+93Nb, 11B+89Y/93Nb reactionsinwhichequilibriumprocessesareobservedasadominant contributorinallthe xn, pxn and -emitting channels.Additionally,precompound emissions overcompoundevaporationhavebeenwitnessedin3n channelinallthe three reactions.Thepreequilibriumfractionisfoundtoincreasewiththeincreasing projectileenergiesandbecomessaturatedaboveacertainenergywherecompound evaporationisnegligible,whichseemtodependoncompositenucleusmassnumber. Chapter 5isdedicatedforthemeasurementofcross-sectionoftheevaporation residues producedviacomplete-incompletefusionreactioninthe 7Li bombardment on natMo/93Nb target.Anenhancementinthemeasuredcrosssectionsofthe xn- emitting channelsincomparisontothosetheoreticalcross-sectionsrevealsthepro- duction ofresiduesthroughtheincompletefusionprocessinadditiontothecomplete fusion. Incompletefusionisfoundtoincreasewiththeincreasingprojectileenergy similar tootherheavy-ionreactions. Chapter 6dealswiththeinvestigationofoptimizedproductionofmedicallyrel- evant 97Ru/101mRh radionuclidesfrom 11B+89Y/93Nb and 32S+70Zn reactions.The study revealsthewideandsuitableenergywindowforthelargeintegralyieldwith su cientpurity. Chapter 7demonstratestheradiochemicalseparationtechniquesfortheextraction of relevantradionuclides, 97Ru/101mRh frombulktarget 89Y/93Nb, respectively. Finally,Chapter8comprisesanoverallsummary/conclusionofthethesiswitha brief futureoutlook.