Theoretical Research in Nuclear Astrophysics

核天体物理理论研究

• 批准号: 8917442
• 负责人: James Truran
• 金额: $ 22.52万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-01-01 至 1992-07-01
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917442&HistoricalAwards=false
• 关键词: Theoretical; Research; Nuclear; Astrophysics

A theoretical research program in nuclear astrophysics will be carried out. Specific areas of study will include investigations in nuclear physics, classical novae and related phenomena, nucleosynthesis, galactic chemical evolution, and the origin of globular clusters. Major problems to be addressed include: (1) the determination of thermonuclear reaction and weak interaction rates relevant to diverse astrophysical studies; (2) the analysis of the general case of electron screening; (3) an analysis of the controlling physics of the super-Eddington phase of evolution of classical novae in outburst; (4) the possible consequences of the phase of commom envelope evolution that is known to be experienced by most classical novae in outburst; (5) the nature of outbursts triggered by high accretion rates onto hot white dwarfs; (6) nucleosynthesis accompanying classical nova outbursts, including the production of the radioactivities sodium 22 (22Na) and aluminum 26 (26Al); (7) the consequences of silicon burning in massive stars of low initial metallicities; (8) the operation of the r-process in the expansion and cooling of highly neutronized matter; (9) s-process nucleosynthesis in red giant stars; (10) nuclear cosmochronology; (11) the evolution of the lithium abundance in the galaxy; (12) the implications of abundances in metal deficient stars for early galactic chemical evolution; and (13) the nature of the origin and early evolution of the Milky Way globular clusters.

核天体物理学的理论研究计划将 贯彻 具体的研究领域将包括调查 在核物理学、经典新星和相关现象中， 核合成，星系化学演化， 球状星团 需要解决的主要问题包括：（1） 热核反应和弱相互作用的确定 与各种天体物理学研究有关的比率;（2） 分析了一般情况下的电子屏蔽;（3）一个 超爱丁顿相的控制物理分析 经典新星爆发演化的可能性; 共同包络演化阶段的后果， 已知大多数经典新星在爆发时都经历过;（5） 高吸积率引发的爆发的性质， 热白色矮星;（6）伴随经典核合成 新星爆发，包括放射性物质的产生 钠22（22 Na）和铝26（26 Al）;（7） 低初始金属丰度的大质量恒星中的硅燃烧; (8)在膨胀和冷却中的R过程的操作 （9）高中子化物质的s-过程核合成 红巨星;（10）核宇宙年代学;（11） 银河系中锂丰度的演变;（12） 缺乏金属的恒星的丰度对早期 银河系化学演化;（13）起源的性质 以及银河系球状星团的早期演化。