用于垒下重离子熔合裂变研究的两维位置灵敏探测器  

Bi-dimension Position Sensitive Detector Used in the Study of Fusion Fission of Heavy Ions at the Sub-Coulomb Barrier Energy Region

作　　者：谭继廉[1] 张金霞[1] 靳根明[1] 张焕乔[2] 钱兴[2] 刘祖华[2] 许谨诚[2] 

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]中国原子能科学研究院,北京102413

出　　处：《高能物理与核物理》1997年第1期8-14,共7页High Energy Physics and Nuclear Physics

摘　　要：描述了用于近垒和垒下重离子熔合裂变实验的主要探测器——两维位置灵敏雪崩室(BPAC)的结构、工作原理及性能.给出了利用 BPAC 探测到的84MeV(E_(cm))^(16)O+^(232)Th 反应中不同碎片角区的碎片折叠角分布,并从中区分了转移裂变和复合核裂变的碎片角分布.从而证明转移裂变不是导致碎片角分布各向异性异常的原因.同时,实验结果支持了预平衡裂变模型对碎片角分布异常现象的解释.The structure,operation principle and performance of the bi-dimension position sensi- tive avalanche chamber (BPAC) used in the study of fusion fission induced by heavy ions at the near and sub-Coulomb barrier energy region are described. The fold angle distribution of fragments in different angle region for 84MeV (E_(cm))^(16)O+ ^(232)Th reaction system was obtained by using BPAC,from which the angle distribution of transfer-fission fragments has been distinguished from that of compound mucleus fission frag- ments.It is thereby certified that transfer-fission is not the reason of anomalous anisotropies of fragment angle distribution.Meanwhile experimental results supported the preequilibrium fission model,in frame of which the anomalous anisotropies of fragment distribution was explained.

关 键 词：熔合裂变 位置灵敏雪崩室 裂变碎片探测器 

分 类 号：TL816.4[核科学技术—核技术及应用]