中能^（12）C离子同厚铋靶反应近靶产物的产额测定

THE YIELD MEASUREMENT OF THE NEAR-TARGET PRODUCTS FROM THE REACTION OF THE INTERMEDIATE ENERGY￣(12)C IONS WITH ￣(209)Bi THICK TARGETS

用放射化学分离及γ谱学技术测量了入射能量为４７ＭｅＶ／ｕ￣（１２）Ｃ离子轰击厚靶反应产物的平均产额，获得了近１００个核素的平均生成截面。基于这些数据并借助于电荷分布及母子体关系的修正，从许多累积及部分累积产额获得了独立产额，同时得到了比靶核少３、４、５个电荷数的产物（即Ｈｇ、Ａｕ、Ｐｔ）的同位素分布曲线，由此得到了中能较轻重离子引起的深部非弹转移反应产生丰中子同位素的有效产额。

Average cross-section of near-target products from the reaction of￣(12)C+￣(209)Bi at intermediateenergy are measured.Their independent yields are obtained from their cumulative and partialycumulative yields according to the experimental data measured in this work and correction ofmother-daugter decay.The yield distribution curves of Pt, Au and Hg isotopes are constructedand it is found that for the peak positions A=188.1,190.9 and 195.8,σ_Z=3.08,2.80 and3. 74,respectively,Averagy production cross-sections are derived from the istopic yield distribu-tion curves for some near-target neutron-rich isotopes.