Research in Theoretical Nuclear Physics

这一提案涵盖了广泛的主题。未来的项目包括理解最近和即将到来的太阳中微子实验所提供的物理机会，探索中微子在超新星动力学中的作用，研究核反应中量子耗散隧道的后果，探索具有多重碎片的原子核的相变，以及开发新的数学技术来解决这些研究中出现的物理问题。观测到的太阳中微子通量与标准太阳模型预测的相比是不足的。中微子在物质和磁场存在下的振荡被用来解释这种缺陷。我们将研究中微子在物质中的输运的一个新方面，即随机介质中中微子振荡的行为。我们对超新星的认识有了很大的进展。改进了爆炸模型，提出了超新星是重元素产生的场所。中微子对这些现象有重要的影响。耗散隧道效应在低能聚变反应中尤为重要。这些反应不仅引起了核天体物理学的兴趣，而且还为反应动力学和核结构提供了新的见解。多重破片是核系统在热压和核结合作用下发生膨胀的碎片的统计发射。它是对相变动力学的一种探索。提出的理论研究将与美国和国外的实验小组密切合作。

This proposal covers a broad range of topics. Future projects include understanding physics opportunities presented by recent and forthcoming solar neutrino experiments, exploring the role of neutrinos in supernova dynamics, investigating consequences of quantum dissipative tunneling in nuclear reactions, exploring phase transitions in nuclei with multi-fragmentation, as well as developing new mathematical techniques to address the physics questions arising in these studies. Observed solar neutrino flux is deficient relative to that predicted by the standard solar model. Neutrino oscillations in the presence of matter and magnetic fields were invoked to explain this deficiency. We will be studying a new aspect of the neutrino transport in matter, behavior of neutrino oscillations in stochastic media. There has been much progress in our understanding of supernovae. Explosion models are improved and supernovae were proposed as a site where heavy elements are created. Neutrinos have a significant impact on these phenomena. Dissipative tunneling is especially important for low-energy fusion reactions. These reactions are not only of interest to nuclear astrophysics, but they also provide new insights into the reaction dynamics and nuclear structure. Multi- fragmentation is the statistical emission of fragments from a nuclear system, which is undergoing expansion under the influence of thermal pressure and nuclear binding. It is a probe of dynamics of phase transitions. The theoretical research proposed will be done in intensive collaboration with experimental groups in the U.S. and abroad.