Nuclear Structure at High Spin (Physics)

这笔赠款支持对极端自转速度下的原子核物理的实验研究。在这样一个快速旋转的系统中，核子受到离心力和科里奥利作用的影响，这会引起核结构的重大变化，包括核形状和转动惯量的变化。这些相互作用也导致了超流体和刚性行为以及集体运动和单粒子运动之间的转变。这些现象将用伽马射线探测器阵列在含有60到90个核子的原子核中进行研究。通过重离子引起的深非弹性碰撞产生的快速旋转的富中子系统也将用这个阵列进行研究。另一组实验将使用橡树岭国家实验室的六个电子光谱仪阵列和伽马探测器阵列来搜索不同形状的状态之间理论上预期的电单极子跃迁。

This grant supports experimental research on the physics ofnuclei at extreme rotational velocities. The nucleons inside such a rapidly rotating system are subject to centrifugal and Coriolis interactions which introduce significant changes in nuclear structure, including changes in nuclear shape and moment of inertia. These interactions also cause transitionsbetween superfluid and rigid behaviour and between collective and single-particle motion. These phenomena will be studiedin nuclei with 60 to 90 nucleons using an array of gamma ray detectors. Rapidly rotating neutron-rich systems produced by means of heavy ion induced deep inelastic collisions will also be studied with this array. Another set of experiments will search for thetheoretically expected electric monopole transitions betweenstates with different shapes, using an array of sixelectronspectrometers in combination with a gamma detector array at the Oak Ridge National Laboratory.