SPHICE: A Strongly Polarized Hydrogen and Deuterium Ice Target for Measurement of the Spin Structure of the Nucloen

研究了一种基于冷冻氢氘分子的新型极化靶。这些技术将改编自用于生产激光驱动聚变研究中使用的颗粒的技术。随着核自旋对齐，这些目标将用于探索核子的自旋依赖结构。具体来说，将测试一个理论和规则（Drell-Hearn-Gerasimov和规则），该规则一方面涉及光子自旋与核自旋方向一致和相反的测量之间的积分总光吸收横截面的差异，另一方面涉及核子的异常磁矩。这是核物理学中一个非常重要的实验，它关系到我们对核子结构的基本理解。这项新技术将使这种测量的精度提高一个数量级。教育也是这项活动不可或缺的一部分。开发的最先进技术将涉及包括低温技术在内的许多技术。研究生和博士后将参与工作的各个阶段。这种培训在许多其他情况下也很有用。

A new type of polarized target based on frozen hydrogen- deuterium molecules will be developed. The techniques will be adapted from the technology developed for producing pellets used in laser-driven fusion studies. With nuclear spins aligned, these targets will be used to explore the spin-dependent structure of the nucleon. Specifically, a theoretical sum rule (the Drell-Hearn-Gerasimov sum rule) will be tested which relates, on one side, the difference in the integrated total photo-absorption cross-section between measurements with photon spin aligned and opposed to the nuclear spin direction, to, on the other side, the anomalous magnetic moment of the nucleon. This is a very high priority experiment within nuclear physics which relates to our fundamental understanding of the structure of the nucleon. The new technology will permit an order of magnitude increase in precision of such measurements. Education is also integral to this activity. The state-of-the-art technology developed will involve many skills including low temperature techniques. Graduate students and postdoctoral fellows will be involved in all phases of the work. The training will be useful in many other settings.