Medium-Energy Physics and Fundamental Interactions

这项为期三年的赠款将支持两名教师的研究小组，他们正在印第安纳州大学回旋加速器设施冷却器储存环上使用极化质子束和内部极化氢靶研究核子-核子相互作用。 实验通过测量p+p反应阈附近中性π介子产生的自旋关联，阐明了重介子交换在短程核子-核子相互作用中的作用。 另一个实验将测量中能区p+d分裂反应的自旋相关性，这将阐明三体力的作用。 极化靶的开发将继续进行;这项工作可能会大大提高储存环中使用的极化气体靶的亮度。 本文将通过测量偏振态为38 K的激光俘获衰变的空间不对称性来研究核中弱相互作用的性质。 这个实验对重右手规范玻色子的存在很敏感，也对更奇特的粒子如细夸克很敏感。 麦迪逊集团在研究生和博士后研究员的教育和培训方面发挥着重要作用。

This three-year grant will support the research group of two faculty who are investigating the nucleon-nucleon interaction using polarized proton beams and an internal polarized hydrogen target at the Indiana University Cyclotron Facility Cooler storage ring. The experiment would illuminate the role of heavy meson exchange in the short range nucleon-nucleon interaction by measuring the spin correlations in neutral pion production near threshold in p+p reactions. Another experiment will measure spin correlations for the p+d breakup reaction in the medium energy regime, which would elucidate the role of three-body forces. Polarized target development would continue; this work may lead to significant improvements in the luminosity of polarized gas targets used in storage rings. The nature of the weak interaction in nuclei will be studied with a measurement of the spatial asymmetry in the decay of laser trapped, polarized 38K. This experiment is sensitive to the existence of heavy right-handed gauge bosons, and also to more exotic particles such as leptoquarks. The Madison group provides an important role in the education and training of graduate students and post-doctoral fellows.