Experimental Nuclear Physics Research Program

我们提出的研究计划旨在更好地理解质子、中子和轻核的夸克结构。特别强调的是在杰斐逊实验室和麻省理工学院贝茨使用电子散射测量核子的电磁和弱性质。这些数据提供了关于核子中电荷和磁化的空间分布的精确信息。我们项目的一个主要组成部分是杰斐逊实验室的G0实验，在该实验中，利用氢和氘极化电子散射中的宇称违逆来确定奇异夸克-反夸克对质子电荷和磁矩的贡献。与这种活性相结合的是对质子结构的“反极”贡献的测定，这是由违反宇称的电磁效应引起的。还提出了利用反冲核子的极化测量来研究核子激发，以及利用kaon电产生来创造超核，其中核系统中的一个核子被λ粒子取代。

Our proposed research program is directed towards developing a better understanding of the quark structure of protons, neutronsand light nuclei. Particular emphasis is placed on measurements of electromagnetic and weak properties of the nucleon using electron scattering at Jefferson Laboratory and MIT-Bates. Such data provide precise information about the spatial distribution of charge and magnetization in the nucleon. A major component of our program is the G0 experiment at Jefferson Laboratory, in which parity violation in polarized electron scattering from hydrogen and deuterium is used to identify the contribution of strange quark-antiquark pairs to the proton's charge and magnetic moment. Coupled to this activity is the determination of "anapole" contributions to proton structure, which arise from parity-violating electromagnetic effects. Also proposed are studies of nucleon excitations using polarization measurementsof the recoiling nucleon, and the use of kaon electroproduction to create hypernuclei in which one nucleon in a nuclear system is replaced by a lambda particle.