Research in Theoretical Nuclear Physics

理论核物理研究

• 批准号: 9605140
• 负责人: Akif Baha Balantekin
• 金额: $ 48.34万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-05-15 至 2001-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9605140&HistoricalAwards=false
• 关键词: Research; Theoretical; Nuclear; Physics

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.

这项建议涉及广泛的议题。未来的项目包括了解最近和即将到来的太阳中微子实验所带来的物理学机会，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穿的后果，探索具有多重碎裂的核的相变，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相对于标准太阳模型的预测是不足的。在物质和磁场存在下的中微子振荡被用来解释这一缺陷。 我们将研究中微子在物质中输运的一个新方面，即中微子在随机介质中的振荡行为。 我们对超新星的了解已经有了很大的进展。爆炸模型得到了改进，超新星被认为是重元素产生的场所。 中微子对这些现象有重大影响。 耗散隧穿对于低能聚变反应尤其重要。 这些反应不仅是感兴趣的核天体物理学，但他们也提供了新的见解的反应动力学和核结构。 多重碎裂是核系统碎片的统计发射，该系统在热压力和核束缚的影响下正在经历膨胀。它是相变动力学的一种探索。 拟议的理论研究将与美国和国外的实验小组密切合作。