合成和研究稀土区质子滴线附近的6种新核素

利用兰州重离子加速装置(HIRFL)的SFC加速器引出的能量为165—180MeV的³⁶Ar重离子束,分别轰击⁹²Mo、⁹⁶Ru和¹⁰⁶Cd缺中子同位位素靶,产生了稀土区质子滴线附近的新核素¹²⁵Nd、¹²⁸Pm、¹²⁹Sm、¹³⁷Gd、¹³⁹Dy和¹³⁹Tb.借助高灵敏度的氦喷嘴快速带传输系统和“p–γ”或“X–γ”符合测量方法对它们进行了分离鉴别,确定它们的半衰期分别为(0.60±0.15)s,(1.0±0.3)s,(0.55±0.10)s,(2.2±0.2)s,(0.6±0.2)s和(1.6±0.2)s,并测量了¹²⁵Nd、¹²⁸Pm、¹²⁹Sm、¹³⁷Gd和¹³⁹Dy的β延发质子能谱,指认了能量为109.0和119.7keV的两条γ射线属于¹³⁹Tb的EC/β+衰变.     

Measurement of the Breakup Cross Sections in ^6He＋^9Be Reaction at 25 MeV／Nucleon

The breakup reaction cross sections were measured for the reaction of^6He at 25 MeV/nucleon from ^9Be target with intensity of 10^5 pps. By fitting the energy spectra of breakup α particles with Gaussian functions, the angular distribution of differential cross sections in the laboratory system has been extracted and compared with the Serber model calculations. The good agreement between the calculation and the experimental data favours a dominant configuration of the ^4He core plus valence neutrons for the structure of^6He.     

晕核6He（25 MeV/u）在9Be上的破裂反应

25 MeV/u 6He+9Be反应的实验中利用多个探测器望远镜对反应产物进行了测量, 对实验中各个角度测量到的4He进行观察, 将其中两个有高能峰成分的探测器划分成三部分, 得到不同角度4He的单举能谱和破裂产生4He的微分截面. Different products of 6He nuclei from 9Be target has been measured with a 6He beam at energy of 25 MeV/u. The energy spectra at different angles for 4He isotope were analyzed and the experiment differential cross sections for the direct breakup reaction were obtained.     

“聚龙一号”丝阵实验轴向一维X光辐射功率分布

通过一维条纹相机诊断系统对聚龙一号(JL-Ⅰ)四类单层丝阵负载进行了轴向X光辐射测量。由于瑞利-泰勒不稳定性的影响,大部分负载表现出两端发光比中间滞后、阳极端发光比阴极端滞后、阳极端发光总强度弱于阴极端的现象。通过不同类型丝阵对比,对于20 mm直径的丝阵,JL-Ⅰ驱动器的匹配负载线质量在0.9 mg/cm附近。轴向辐射同步性与辐射功率之间存在相关性。