~(95)Zr、~(140)Ba和~(147)Nd产额的精确测定
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摘要: 用ＨＰＧｅ直接ｒ射线能谱法绝对测定热中子和８ＭｅＶ中子诱发￣（２３５）Ｕ裂变的￣（９５）Ｚｒ、￣（１４０）Ｂａ和￣（１４７）Ｎｄ的产额。绝对裂变率用双裂变室测定，并首次根据测定的ｒ放射性活度来检验裂变室的效率。同时给出产额的“快热比”，以编评热能值为标准得到８ＭｅＶ点的产额值。结果证明，在８ＭｅＶ能点处，产额值偏离随中子能量变化呈ｅ指数关系。Abstract: PRECISE DETERMINATION OF YIELDS OFANDLIZE；CUI ANZHI；LIU DAMING；LIU YONGHUI；WANG XIUZHI；JING KEXING；TANG PEIJA；YANG YI；ZHANG SHULAN；LI XINHUA；SUN HONGOING；LIU CONGGUI；LI DAMING；ZHANG SHENGDONG；AN XINYU；GUO JINGRU（China Institute of Atomic Energy,P.O.Box 275（48），Beijing 102413）ABSTRACT Fission yields of and are determinded for the fission of induced by ther-mal and 8 MeV neutrons by HPGe r-ray spectrometry. Absolute fisson rate is monitored with adouble-fission chamber. The efficiency of the fission chamber is checked with absolute determina-tion of activity from（n，r）reaction for the first time.Fission product activities ofirradiated foils are rneasured by HPGe r-ray spectrometry without chemical separation.Timeof flight technique and measurement of the fission ratio of are used to estimated the fis-sion events induced by neutrons of other energies．Ratio of"fast yield"to"thermal yield" is alsoobtaincd precisely because of elimination of some svstematic errors.The ratio and evaluated valueof"thermal yield "are used to get more accurate"fast yield" values. The results document thatthe yield values at 8 MeV energy point deviate from those from exponential function values.Key words Fission yield ThermaI neutrons 8 Mev neutrons r-ray spectrome-try Precise determination
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[1] １ＧｌｅｎｄｅｎｉｎＬＥ，ＧｉｎｄｌｅｒＪＥ，ＨｅｎｄｅｒｓｏｎＤＪ，ｅｔａｌ．ＭａｓｓＤｉｓｔｒｉｂｕｔｉｏｎｓｆｏｒＭｏｎｏｅｎｅｒｇｅｔｉｃ－Ｎｅｕｔｒｏｎ－ＩｎｄｕｃｅｄＦｉｓ－ｓｉｏｎｏｆ．ＰｈｙｓＲｅｖ，１９８１，Ｃ２４：２６００．２ＣｈａｐｍａｎＴＣ，ＡｎｇｅｌｏｎＣＡ，ＳｐｉｔａｌｓＣＣ，ｅｔａｌ．ＦｉｔｓｓｉｏｎＰｒｄｕｃｔＹｉｅＭｓＦｒｏｍ６－９ＭｅＶＮｅｕｔｒｏｎ－ＩｎｄｕｃｅｄＦｉｓｓｉｏｎｏｆａｎｄ．Ｐｈｖ，Ｒｅｖ，１９７８，Ｃ１７：１０８９．３ＪａｍｅｓＭＦ，ＭｉｌｌｓＲｗ，ＷｅａｖｅｒＤＲ．ＡＮｅｗＥｖａｌｕａｔｉｏｎｏｆＦｉｓｓｉｏｎＰｒｏｄｕｃｔＹｉｅｌｄｓａｎｄｔｈｅＰｒｏｄｕｃｔｉｏｎｏｆａＮｅｗＬｉｂｒａｒｙ（ＵＫＦＹＺ）ｏｆＩｎｄｅｐｅｎｄｅｎｔａｎｄＣｕｍｕｌａｔｉｖｅＹｉｅｌｄｓ，ＰａｒｔＩＩ，ＴａｂｌｅｓｏｆＭｅａｓｕｒｅｄａｎｄＲｅｃｏｍｍｅｎｄｅｄＦｉｓｓｉｏｎＹｉｅｌｄｓ：ＡＥＡ－ＴＲＳ－１０１８．１９９１．４李泽，王连壁，王维国，等．裂变率的绝对测量．原子能科学技术，１９８０，５：６００．５石宗仁，曾宪堂，张明．高纯热中子束装置及设计．核技术，１９８９，１２：１４３．６李泽，张春华，刘从贵，等．８．３ＭｅＶ中子引起裂变的质量分布．原子核物理，１９８５，７：９７．７刘大鸣，李泽，孙宏清，等．ｒ射线在铀靶中自吸收校正系数的测量．中国原子能科学研究院放射化学研究所内部资料．１９９４．８ＷａｎｇＬｉｙｕ．ＭｕｌｔｉｐｌｅｔＰｒｏｃｅｓｓｉｎｇｉｎＨｉｇｈＲｅｓｏｌｕｔｉｏｎＧａｍｍａＳｐｅｃｔｒｏｓｃｏｐｙ．ＡｐｐｌＲａｄｉａｔＩｓｏｔ，１９８９，４０：５７５．９刘运作．常用放射性核素衰变纲图．北京：原子能出版社，１９８２．１０ＷｅｓｔｃｏｔｔＣＨ，ＷａｌｋｅｒＷＨ，ＡｌｅｘａｎｄｅｒＴＫ．ＥｆｆｅｃｔｉｖｅＣｒｏｓｓＳｅｃｔｉｏｎｓａｎｄＣａｄｍｉｕｍＲａｔｉｏｓｆｏｒｔｈｅＮｅｕｔｒｏｎＳｐｅｃｔｒａｏｆＴｈｅｒｍａｌＲｅａｃｔｏｒｓ．Ｉｎ：ＰｒｏｃｃｅｄｉｎｇｓｏｆｔｈｅＳｅｃｏｎｄＵｎｉｔｅｄＮａｔｉｏｎｓＩｎｔｅｒｎａｔｉｏｎａｌＣｎｎｆｅｒｅｎｃｅｏｎｔｈｅＰｅａｃｅｆｕｌＵｓｅｓｏｆＡｔｍｏｉｃＥｎｅｒｇｙ．Ｇｅｎｅｖａ，Ｓｅｐｔ．１９５８，ｖｏｌ．１６．７０－７５．１１ＷｅｓｔｃｏｔｔＣＨ．Ｅｆｆｅｃｔ
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