Theoretical Studies of Hadronic and Nuclear Dynamics

这项研究的主要目的是研究核强子动力学，特别强调它与量子色动力学(QCD)的关系，QCD是夸克和胶子的基本动力学。我们特别感兴趣的是手征对称性的作用，它是QCD的基本对称性之一。手征微扰理论提供了一个系统和实用的框架，将QCD的对称性转化为强子的对称性，强子是实际构成原子核的粒子。我们的研究广泛使用了这种形式主义。同时，对于目前手征微扰理论无法适用的现象，我们将其归结为保持手征对称性和适用于复杂原子核的模型。具体地说，我们研究了：(1)核手征微扰理论应用于少数核子系统的结果；(2)轻核上的Muon俘获及其与轻核的中微子相互作用的关系；(3)中微子-中子核截面的辐射修正，这将是萨德伯里中微子天文台获得下一代高精度太阳中微子数据的重要修正；(4)Sigma模型和手征微扰理论的比较；以及(5)稠密物质中的奇异性凝聚。

0140214MyhrerThe main aim of the research is to investigate nuclear-hadronicdynamics with a particular emphasis on its relation to quantumchromodynamics (QCD), the fundamental dynamics of quarks and gluons. Weare particularly interested in the role of chiral symmetry, which is oneof the basic symmetries of QCD. Chiral perturbation theory offers a systematic and practical frameworkto translate the symmetries of QCD into those of hadrons, particles thatactually constitute nuclei. Our research makes extensive useof this formalism. At the same time, for those phenomena which are atpresent beyond the applicability of chiral perturbation theory, weresort to models that preserve chiral symmetry and that can be appliedto complex nuclei. Specifically, we study: (1) Consequences of nuclear chiral perturbation theory as applied tofew-nucleon systems; (2) Muon capture on light nuclei and its relation to neutrinointeractions with light nuclei; (3) Radiative corrections for the neutrino-deuteron cross sections,corrections that will be of importance for next-generation highprecision solar neutrino data to be obtained at the Sudbury NeutrinoObservatory; (4) Comparison of the sigma model and chiral perturbation theory; and (5) Strangeness condensation in dense matter.