Studies on the damping mechanism of highly excited states in Nuclei

本项目是九州大学集团在联合研究中心，即，大坂大学原子核物理研究中心（RCNP）原子核高激发态的阻尼机制的实验。实验是用高分辨率光谱仪RAIDEN进行的。本课题组使用的摄谱仪的焦平面探测器系统由九州大学集团制造。1986年，对数据采集系统和数据分析系统进行了多微机系统升级，焦平面探测器的长度由1.5m延长到1.8m，大大提高了数据采集和分析的能力。本系统升级完成后，首先对旧数据进行数据分析并发布。1987年开始了一个新的核阻尼机制研究项目。本文详细研究了65 MeV下^&lt;40，42，44，48&gt;Ca（p^^ &gt;，d）反应的单空穴态<->。进行了两次机时实验，获得了激发能为0 - 20 MeV的^&lt;40，44，48&gt;Ca（p^^<->&gt;，d）^&lt;39，43，47&gt;Ca反应的较好数据。对实验数据进行了分析，指出了单空穴状态下的碎裂和阻尼现象。已经对部分数据进行了分析，并开始提交文件。通过这个项目，我们对深束缚空穴态的核阻尼机制的理解有了很大的发展。

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.