US-Poland Research on Nuclear Structure at High Spin (Physics)

这个美国-波兰研究项目的目标是匹兹堡大学的Jurg X. Saladin博士和dr。华沙大学的W. Nazarewicz， S. Cwick和Z. Szymanski将研究极端旋转速度条件下的原子核。在质量70到80的区域，研究将集中在旋转带的性质上，其特征是快速变化，作为质子和中子数量的函数和作为角频率的函数。研究人员将确定转动惯量、电磁跃迁速率、自旋排列、信号分裂和信号反转的数量。他们将通过曲柄壳模型计算来解释这些测量结果，其中包括斯特鲁京斯基平均，并考虑到配对相互作用的影响。他们将使用一组微型橙色电子能谱仪在质量为80的区域寻找电分子跃迁。单极子跃迁依赖于不同形状带的混合和均方根半径的变化。研究人员将使用相同的测量方法研究稀土区超变形带向正常变形带的衰变。他们还将研究锕系元素区域的八极效应。该理论核物理项目通过使美国和东欧的领先专家在共同感兴趣和能力强的领域结合互补人才和汇集资源，实现了推进科学知识的计划目标。

The objective of this US-Poland research project between Dr. Jurg X. Saladin of the University of Pittsburgh and Drs. W. Nazarewicz, S. Cwick, and Z. Szymanski of the University of Warsaw is to study nuclei under conditions of extreme rotational velocities. In the mass 70 to 80 region, the studies will focus on properties of rotational bands which are characterized by rapid changes as a function of the number of protons and neutrons and as a function of angular frequency. The researchers will determine quantities of the moments of inertia, electromagnetic transition rates, spin alignment, signature splitting and signature inversion. They will interpret the results of these measurements by means of cranked shell model calculations, which include Strutinsky averaging and take into account the effects of the pairing interaction. They will search for electric molecule transitions in the mass 80 region using an array of mini- orange electron spectrometers. Monopole transitions depend on the mixing of bands with different shapes and on the changes in the rms radius. The researchers will study the decay of superdeformed bands in the rare earth region into bands of normal deformation using the same measurements. They will also study the octupole effects in the actinide region. This project in theoretical nuclear physics fulfills the program objective of advancing scientific knowledge by enabling leading experts in the United States and Eastern Europe to combine complementary talents and pool resources in areas of strong mutual interest and competence.