Scattering of intermediate energy unstable nuclear beam with a solid hydrogen target and measurements of density distribution of Oxygen 20 nucleus

设计并构建了一个反冲粒子谱仪，用于测量固体氢片上不稳定核束的弹性和非弹性散射。在第一个财政年度，我们测试了我们的探测器系统，该系统由动量标记计数器、束线漂移室、用于飞行时间测量的束线闪烁计数器、用于反冲氢和触发闪烁体的漂移室和NaI（Tl）量热计组成。在使用氧气20的测试光束时间之后，我们决定使用22Ne的分解反应来获得高强度的200光束。通过这个决定，我们得到了10倍以上的光束强度。与重离子同步加速器HIMAC的光束时间平行，我们使用东北大学回旋加速器RI中心提供的80 MeV质子束测试了NaI（Tl）量热计。由于我们的量热计是由5cm x 5cm x 45cm长的NaI（Tl）棒制成的，因此光的位置依赖性会降低量热计的能量分辨率。因此，我们需要知道闪烁体光输出的位置依赖关系，以便为量热计获得良好的能量分辨率。在2000年财政年度，我们对重离子同步加速器HIMAC提供的9C和20O不稳定核束的质子弹性散射进行了测量。靶材方面，我们在9C和20O分别使用了5mm和1mm厚度的固体氢靶材。在8月和9月，我们已经部分完成了测量。经过半年的数据整理，我们第一次成功地获得了9C和200在中能量下质子弹性散射的角分布。研究结果已在2007年春季日本物理学会会议上发表，并将于2007年7月在东京举行的国际核物理大会上发表。现在对我们的数据进行理论分析，推断出原子核220和9C的密度分布。少

We have designed and constructed a recoil particle spectrometer for the measurements of elastic and inelastic scattering of the unstable nuclear beam with a solid hydrogen sheet. In the 1st fiscal year we tested our detector system made of momentum tagging counters, beam line drift chambers, beam line scintillation counters for the time of flight measurements, drift chambers for recoil hydrogen and trigger scintillators and NaI(Tl) calorimeters by using the unstable nuclear beam of Oxygen 20. After the test beam time for the use of Oxygen 20, we have decided to use a break up reaction of 22Ne to obtain high intensity 200 beam. By this decision we have obtained more than 10 times beam intensity. In pararell to the beam time at the Heavy Ion Synchrotron HIMAC we have tested the NaI(Tl) calorimeter using the 80 MeV proton beam supplied at Cyclotron RI center of Tohoku University.. Since our calorimeters are made of NaI(Tl) Of 5cm x 5 cm x 45 cm long rod, position dependence of the light o … More utput deteriorates the energy resolution of the calorimeters. Thus we need to know the position dependence of the light output from the scintillators in order to obtain a good energy resolution for the calorimeter.In the 2^<nd> fiscal year we have performed a measurement of the elastic scattering of protons for the unstable nuclear beam of 9C and 20O supplied by the heavy ion synchrotron HIMAC. As for the target we have used solid hydrogen targets of 5mm thickness and 1 mm thickness for 9C and 20O respectively. In August and September we have partially completed the measurements After a half year's data reduction we have succeeded to obtain angular distributions of proton elastic scattering off 9C and 200 for the first time at intermediate energy. The results were reported at the meeting of the physical society of Japan in spring 2007 and will be reported at the international congress of nuclear physics held in Tokyo July 2007. Our data are now theoretically analyzed to deduce the density distribution of the nuclei 220 and 9C. Less