14MeV中子引起的（n，2n）核反應截面的測量.pdf

1、蘭州大學碩士學位論文14MeV中子引起的（n，2n）核反應截面的測量姓名：劉中杰申請學位級別：碩士專業(yè)：粒子物理與原子核物理指導教師：孔祥忠20050501AbstractCrosssectionmeasurementsfor(n，x)reactionsinducedby14MeVneutronwassystematicallydiscussedinthepresentWOrk，andeachcorrectionwasdemonstra

2、tedindetailCrOSSsectionsforfourfn2n)reactionsweremeasuredbytheactivationmethodThecrosssectionsof”Se(n2n)”SewereevaluatedbythecodeofHFTTTheirradiationofsamplesWascarriedoutattheZF300IIIntenseNeutronGeneratoratLanZhouUnive

3、rsityTheneutronenergiesinthesemeasurementsWeredeterminedbvthemethodofcrosssectionratiosfor90Zr(n，2n)89”gzrand93Nb(n，2n)gzmNbThecrosssectionsfor93Nb(n，2n)92mNb和”AI(n，a)24Nareactionwereselectedasstandardtomeasurethescreact

4、ionsThegammarayactivityofthesampleswasmeasuredbyaCH8403coaxialhighpuritygermaniumdetectormadeinChinaTheresultsof1896士69mband272士98mbwereobtainedatneutronenergiesof141士02and146土03MeVfor“Se(n，2n)”Sereactionrespectively：780

5、5土283mband10231士371mbfor”Se(n，2n)”Sereaction；441土160mband431土156mbfor82Se(n，2n)819Sreaction：1078士391mband1114404mb婦82Se(n，2n)”Sereactionweanalyzedtheerroroftheresultsandcomparedtheresultswiththe1iteratumvaluesThe”Se(n2n)

6、oSereactionWasevaluatedbythecodeHFTTandtheexcitationfunctioncurvesweremadeoutWeanalyzedthefeatureofcrosssectionschangingwiththeneutronenergieschangedKeyword：14MeVneutron；activation；crosssection；(n，2n)reaction；theexcitati