A≈110质量区奇A核形状演化研究

应用E-GOS（E-Gamma Over Spin）曲线方法研究了A≈110质量区奇A核结构随角动量增加的演化, 发现随着角动量的增加原子核的激发特性从振动逐渐演化为转动。 The E-GOS（E-Gamma Over Spin）curves were used to investigate the structure evolution in the odd A nuclei around A≈110 as a function of spin. The result shows that there is a clear transition from vibration to rotation while increasing spin.     

高纯锗探测器在近代物理实验教学科研中的应用

高纯锗(HPGe)探测器是上个世纪70年代发展起来主要用于探测?射线的实验仪器。因其具有能量分辨率高、线性范围宽、探测效率高、性能稳定等优点,被广泛应用于核辐射探测领域中。本文对HPGe的基本结构、探测原理、技术发展以及在大学近代物理实验教学科研中的应用进行了详细阐述。     

145Er的β延发质子衰变性质研究

通过92Mo(58Ni, 2p3n)熔合蒸发反应生成了非常缺中子核145Er。利用氦喷嘴带传输系统把研究目标核传输到低本底测量站, 进行了质子 γ符合测量, 得到了不受同量异位素干扰的145Er的β延发质子谱。经过仔细分析与延发质子符合的γ谱, 发现了145Er的11/2-同核异能态具有β延发质子衰变性质。经拟合退激144Dy不同激发态γ跃迁的衰变曲线, 得出145Er的1/2+基态和11/2-同核异能态的半衰期分别为(1.6±0.6)和(0.6±0.1) s。最后, 简单介绍了中重质量区缺中子新核素的合成及衰变研究计划。The neutron deficient isotope 145Er was produced via the fusion evaporation reaction 92Mo(58Ni, 2p3n). The reaction products were transported to a low background counting area using a He jet tape transport system, and proton γ coincidence measurements were carried out. Based on the analysis of γ transitions in coincidence with β delayed protons, the β delayed proton decay of an νh11/2 isomer in 145Er was proposed. By fitting the decay curves of the γ transitions depopulating the low lying states in 144Dy, the half lives of the ground state and the νh11/2 isomeric state in 145Er were deduced to be (1.6±0.6) and (0.6±0.1) s, respectively. An experimental plan to synthesize new β delayed proton precursors in the medium heavy mass region has been presented.     

基于准稳态实验方法研究橡胶材料的热传导性质

采用准稳态方法探讨测量橡胶材料导热系数的最佳实验条件,当在加热电压为18V,测量时间间隔为60s时,橡胶导热系数的测量值λ=(0.64±0.030)W/(m·K),与相关文献给出的参考值误差非常小.在满足测量精度的前提下,准稳态法具有操作简便、耗时少、实验条件容易达到,得出的结果更加准确.     

一种简易数显温度计的设计与制作

在光杠杆法测量金属线胀系数实验中,针对传统温度计距离较远无法准确读数的问题,本工作基于DS18B20温度传感器设计并制作了一种简易的数显温度计,可实现通过数字显示温度的方法进行测温。经与传统水银温度计的测量结果进行对比,发现数显温度测量仪器具有操作方便,测量精度高等优点。     

Properties of the β-delayed proton decay of 146Ho

The proton-rich isotope 146Ho was produced via the fusion-evaporation reaction ^92Mo （^58Ni, 3p1n）. The β-delayed proton decay of 146Ho was studied by proton-γ coincidence measurements using a He-jet tape transport system. The γ-transitions in ^145Tb following the proton emissions were observed, and the β-delayed proton branching ratios to the final states in the grand-daughter nucleus ^145Tb were determined. According to the relative branching ratios, the ground-state spin of 146Ho has been proposed and the possible configuration discussed.     

Properties of the ν7/2-[503]（f7/2） band in 185Pt

High-spin states in ¹⁸⁵Pt have been reinvestigated via the reaction ¹⁷³Yb(¹⁶O, 4n) at a beam energy of 90 MeV. The previously known band based on the ν7/2^-[503](f_7/2) Nilsson orbital has been extended to higher spin states. Properties of the ν7/2^-[503](f_7/2) band have been discussed with an emphasis on the evolution of configuration while increasing the spin.     

130Ba中的集体运动

为探索原子核中的集体运动，一项在意大利Legnaro实验室XTU串列加速器上开展的在束${\rm{\gamma }}$谱学实验研究大幅拓展了130Ba的能级结构。实验以能量为65 MeV的13C束流轰击120Sn薄靶，布居130Ba的激发态。从激发态退激的${\rm{\gamma }}$射线由GALILEO阵列探测，而与之关联的蒸发粒子由带电粒子阵列EUCLIDES和中子墙NWALL探测。分析符合数据鉴别了一系列新的转动带，其中一部分布居9.4 ms同核异能态。结合已知的电四极矩和磁矩信息，提取了该同核异能态的g因子。分析多条转动带，发现130Ba可能处于长椭形变，也可能处于扁椭形变，而其集体转动方向可能沿主轴，也可能沿主轴以外的倾斜方向。这是首次在130核区发现沿倾斜方向的集体转动。理论分析建议将部分新发现的结构解释为基于二准粒子组态的摇摆运动，这是实验上在偶偶核中观测到的首例基于两准粒子组态的摇摆带结构。     

101Pd高自旋态研究

利用日本原子力研究机构串列加速器提供的能量为85和95 MeV的28Si束流,通过重离子熔合蒸发反应76Ge(28Si,3n),布居了101Pd的高自旋激发态。根据标准在束核谱学实验测量结果,拓展了基于d5/2和1/2-[550]组态的能级纲图,新发现了1/2-[550]组态的非优惠旋称分支,完整观测到了101Pd原子核中正负宇称带的带交叉现象。根据系统性分析,将101Pd中观测到的带交叉现象归咎于g9/2质子顺排。     

101Pd晕线的结构演化

High-spin states in ^101Pd have been investigated experimentally via the ^76Ge（^28Si, ^3nγ）^101pd reaction. The previously known bands based on the d5/2 and h11/2 neutron orbitals have been extended to higher-spin states, and two new structures have been observed. Spin and parity were assigned to the levels on the basis of the experimental results of the angular distribution of y rays deexciting the oriented states. For the ground-state band, the E-COS （E-Gamma Over Spin） curve strongly suggests a structure transition from vibration to rotation while increasing spin.