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RADIOCHEMICAL STUDIES OF NUCLEAR REACTIONS INDUCED BY INTERMEDIATE ENERGY HEAVY IONS.

中能重离子引起的核反应的放射化学研究。

基本信息

批准号：
63470036
负责人：
FURUKAWA Michiaki
金额：
$ 0.45万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

Nuclear reactions induced by intermediate energy heavy ions were studied with radiochemical technique to determine formation cross sections of radionuclides in the wide range of mass numbers. The results are necessary to obtain information on nuclear reaction mechanism as well as production of useful radioisotopes.Thin foils of AI, V, Cu, Ho and Au were bombarded with ^<14>N^<7+>(35 and 135 Mev/u) and ^<40>Ar^<17+>(26 and 95 Mev/u ) ions from the RIKEN Ring Cyclotron. Targets were usually covered with aluminum foils to obtain "mean recoil range". Radionuclides formed were assayed with a gamma-ray spectrometer. The counting data were analyzed with computers to obtain cross sections.The bombardments of copper foils were performed with all types of the ions. Radionuclides from ^7Be to ^<72>As were identified and determined. Heavier nuclides like ^<67>Ga were, however, only detected when the target was bombarded with ^<40>Ar^<17+>( 26MeV/u ). The mean recoil ranges of ^<40>Ar bombardments were larger than those of ^<14>N projectile of nearly the same energies, and they decreased with increase of incident energies.Gamma-ray spectra of the irradiated gold targets showed very complex pattern. The changes of spectra were followed for several months and decay curves of individual gamma-ray peak areas were analyzed. Analyses of the experimental results of the other targets are in progress.

用放化技术研究了中能重离子诱发的核反应，确定了宽质量数范围内放射性核素的生成截面。用<14><40>RIKEN环形回旋加速器的~（17+）和~（17+）离子分别轰击Al、V、Cu、Ho和Au的薄箔。通常用铝箔覆盖目标以获得“平均后坐距离”。形成的放射性核素用伽马射线光谱仪分析。用计算机对计数数据进行分析，得到截面，用各种离子轰击铜箔。从^7 Be到^ As的放射性核素<72>被鉴定和测定。然而，像^ Ga这样较重的核素<67>只有在用^<40>Ar^<17+>（26 MeV/u）轰击靶时才能检测到。结果表明，在相同能量下，^ Ar轰击金靶的平均反冲射程<40>大于^<14>N轰击金靶的平均反冲射程，且反冲射程随入射能量的增加而减小。对谱的变化进行了几个月的跟踪，并分析了单个γ射线峰面积的衰减曲线。对其他目标的实验结果的分析正在进行中。