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

我们设计并建造了一台反冲粒子谱仪，用于测量不稳定核束与固体氢片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，包括动量标记计数器、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使用氧的不稳定核束20的NaI(Tl)量热计。在测试束时间用于氧20之后，我们决定使用22Ne的分裂反应来获得高强度的200束。通过这一决定，我们已经获得了超过10倍的光束强度。与重离子同步加速器HIMAC的束流时间平行，我们用东北大学回旋加速器RI中心提供的80 MeV质子束对NaI(Tl)量热计进行了测试。由于我们的量热计是由5厘米×5厘米×45厘米长的NaI(Tl)棒制成的，所以…的位置依赖关系输出越多，量热仪的能量分辨率就越差。因此，我们需要知道闪烁体输出光的位置依赖关系，以便获得良好的能量分辨率。在本财政年度，我们对重离子同步加速器HIMAC提供的9C和200O不稳定核束的质子弹性散射进行了测量。对于靶，我们使用了厚度为5 mm和1 mm的固体氢靶，分别为9C和200O。经过半年的数据整理，我们在8月和9月已经完成了部分测量，首次获得了中能质子在9C和200附近的弹性散射角分布。这一结果已在2007年春季日本物理学会会议上报告，并将在2007年7月在东京举行的国际核物理大会上报告。现在对我们的数据进行了理论分析，以推导出220和9C核的密度分布。较少

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