Studies on the damping mechanism of highly excited states in Nuclei

本项目为九州大学组在大阪大学核物理研究中心（RCNP）联合研究中心研究原子核高激发态阻尼机制的实验系统的支持。实验采用高分辨率摄谱仪RAIDEN进行。该组使用的该光谱仪的焦平面探测系统是由九州大学研究组建造的。1986年，采用多微机系统对数据采集系统和数据分析系统进行了升级，焦平面探测器的长度由1.5 m延长到1.8 m。通过这些努力，数据采集和分析的能力大大提高。本次系统升级完成后，首先对旧数据进行数据分析并发布。并发表了一篇数据采集系统的论文。1987年，一个新的核阻尼机理研究项目开始了。这是在65兆电子伏特下，用（p^^<->>,d）反应在^<40,42,44,48>Ca中的单孔态的详细研究。进行了两次机器时间实验，获得了激发能在0 - 20 MeV范围内^<40,44,48>Ca(p^ <->>,d)^<39,43,47>Ca反应的良好数据。从单孔状态下的破碎现象和阻尼现象的角度对数据进行了分析。部分数据已经分析完毕，论文提交工作已经开始。通过本课题的研究，对深束缚空穴态核阻尼机理的认识有了很大的发展。

This project is a support of the experimental system for the study of the Kyushu University Group at joint research center, i.e., Research Center of Nuclear Physics, Osaka University (RCNP) on the damping mechanism of highly excited states in nuclei.The experiments are performed with a high resolution spectrograph RAIDEN. The focal plane detector system of this spectrograph used in this group is constructed by Kyushu University Group. In 1986, the data accuisition system and data analysis system are upgraded with multi microcomputer system, and the length of the focal plane detector is lengthen from 1.5 m to 1.8 m.With these efforts, the power of the data accuisition and analysis is largely improved. After this system grade-up is completed, the data analysis of old data are analyzed firstly and published. A paper for the data accuisition system is also published.In 1987, a new project of the study on the nuclear damping mechanism started. This is the detailed investigation of the single hole states in ^<40,42,44,48>Ca with (p^^<->>,d) reactions at 65 Mev. Two times of machine-time have been performed and quite good data of ^<40,44,48>Ca(p^^<->>,d)^<39,43,47>Ca reactions to the excitation energy region 0 - 20 MeV are obtained. The data are analyzed with view points of the fragmentation and damping phenomena in a single hole state. Already, a part of the data are analyzed and the submittion of paper has started. With this project, the understanding on the nuclear damping mechanism of the deeply bound hole states has been greatly developed.