Study of interaction potentials in reactions induced by nuclei far from the stability

远离稳定的原子核引发的反应中相互作用势的研究

基本信息

批准号：
03452022
负责人：
SHIMODA Tadashi
金额：
$ 4.22万
依托单位：
Osaka 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：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452022/
关键词：
Nuclei Far From The Stability Secondary Beam Elastic Scattering Inelastic Scattering Optical Potential Energy Degrader Achromatic Beam Monochromatic Beam

项目摘要

Study of interaction potentials between complex nuclei have brought us fruitful information on both nuclear structure and reaction mechanism. We have opened up a systematic study of the interaction potentials associated with unstable nuclei by measuring the elastic and inelastic cross sections induced by beams of unstable nuclei. We have designed and constructed a new facility "secondary-beam line" which delivers unstable nuclear beams. The facility is to be used with high energy heavy-ion beams from the new cyclotron at the Research Center for Nuclear Physics at Osaka University. Our secondary-beam line takes advantage of A- and Z- dependence of the energy loss of ions in matter (energy degrader). and enables us to obtain the reaction products in the form of a secondary beam. Ion-optical consideration has been made for the separator by treating the degrader as one of the ion-optical elements. By this new treatment it has been made possible to optimize the optics of the system accordin … More g to experimental requirements. We have investigated the methods (i) to achieve an achromatic focusing of the secondary beams and (ii) to obtain beams with small energy spread. Based on the design study. the secondary-beam line has been constructed by the end of FY1192. The performance of the beam line has been successfully tested with 300 MeV alpha beam in February 1992. the new cyclotron is still under tuning for light-ion beams. Although heavy-ion beams which are inevitable for our experiments have not yet been accelerated. they will be injected into our beam line hopefully in early summer of 1993. A detector system with large solid angle and high energy and position resolutions has been constructed. The detector system consists of 12 strip position sensitive Si-DELTAW detector and CsI(TI)-E detector. Compact pre-amplifies system has also been designed to cope with a large number of signals from the detector system; the number of the amplifies are 50 typically. The detector system showed satisfactory performance in an on-line test with low energy heavy-ion beams. In summary we have constructed the secondary-beam line which delibers beams of unstable nuclei. and we are ready to investigate the elastic and inelastic scatterings induced by unstable nuclear beams. Less

复杂核之间的相互作用潜力的研究为我们带来了有关核结构和反应机制的富有成果的信息。我们通过测量由不稳定核的光束诱导的弹性和非弹性横截面，对与不稳定核相关的相互作用电位进行了系统的研究。我们设计并构建了一个新的设施“次要梁线”，该设施提供了不稳定的核梁。该设施应与大阪大学核物理研究中心的新回旋体的高能量重离子束一起使用。我们的二次光束线利用了物质中离子能量损失的A和Z依赖性（能量降解器）。并使我们能够以次级光束的形式获得反应产物。通过将降解器视为离子光元素之一，已经对分离器进行了离子光学考虑。通过这种新处理，已经可以根据……根据实验要求来优化系统的光学元件。我们已经研究了（i）以实现二级束和（ii）获得具有较小能量传播的光束的方法（i）。基于设计研究。次级梁线已在FY1192的末尾构建。 1992年2月，已经用300 MEV Alpha梁成功测试了光束线的性能。新的回旋器仍在调整轻型离子光束的情况下。尽管对于我们的实验不可避免的重型离子梁尚未加速。希望在1993年初夏季将它们注入我们的光束线。已经构建了具有较大的实体角度，高能量和位置分辨率的检测器系统。检测器系统由12个带状位置敏感的Si-Deltaw检测器和CSI（TI）-e检测器组成。紧凑的预分化系统也已设计为应对检测器系统的大量信号。放大器的数量通常为50。检测器系统在低能重离子束的在线测试中显示出满意度的性能。总而言之，我们构建了二次梁线，该线路将不稳定的核束的光束束缚。我们准备研究不稳定的核梁引起的弹性和非弹性散射。较少的