S - process nucleosynthesis in agb stars : the asymptotic distribution of neutron exposures 中子辐照量渐近分布
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Big - bang nucleosynthesis 大爆炸核合成
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Big bang nucleosynthesis 大爆炸核合成
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S - process nucleosynthesis in agb star : the probability of a fe seed nucleus experiencing neutron irradiation 铁种子核受中子照射的概率
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S - process nucleosynthesis may be a useful constraint for the evolution and convection in massive stars 过程核合成可以为大质量星的演化和对流提供有用的约束。
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In this dissertation , the theory of radiative capture reaction and the s - process of nucleosynthesis of heavy element of astrophysics have been investigated 本文研究了辐射俘获反应理论和天体重元素核合成的s ?过程。
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Adopting single pulse neutron exposure 22ne ( a , n ) 2dmg and the updated neutron cross section , making use of the core helium burning model of the single neutron exposure theory , we calculate the s - process nucleosynthesis in massive stars at different mettalicity and compare the results with the solar s - weak component 我们采用单脉冲中子源‘ zne （ a ， n ） zsmg ，采用最新发表的中子俘获截面，用中心氦燃烧模型计算了各金属丰度情况下15m m叼0m 。的大质量星的s过程核合成，并将所得结果与太阳的s刁分量进行比较。
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Simultaneously , enhancement of the cross section must has had been played an important role in astrophysical nuclear process . we investigate the s - process of nucleosynthesis of heavy element of astrophysics and give a group of analytic solutions for the s - process . to check up the analytic solutions , we calculate the n distributing of the heavy element of s - process in solar system and the result is good agreement with astronomic measurement 我们研究了天体重元素核合成的s ?过程，给出了s ?过程网络方程的一个解析解，作为对本文解析解的检验，我们计算了太阳系的s ?过程重元素丰度的n分布，计算结果与天文观测符合的较好；另外，我们还计算了s ?过程的典型分叉点~ ( 85 ) kr处各个核素的丰度变化，与已有的结果符合的较好。
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Topics include : planets , planet formation ; stars , the sun , " normal " stars , star formation ; stellar evolution , supernovae , compact objects ( white dwarfs , neutron stars , and black holes ) , plusars , binary x - ray sources ; star clusters , globular and open clusters ; interstellar medium , gas , dust , magnetic fields , cosmic rays ; distance ladder ; galaxies , normal and active galaxies , jets ; gravitational lensing ; large scaling structure ; newtonian cosmology , dynamical expansion and thermal history of the universe ; cosmic microwave background radiation ; big - bang nucleosynthesis 课程的主题包含了：行星、行星形成；恒星、太阳、正常的恒星、恒星形成；恒星演化、超新星、致密天体(白矮星、中子星及黑洞) 、波霎、双x -射线源；星团、球状及疏散星团；星际介质、气体、尘埃、磁场、宇宙射线；距离阶梯；星系、正常及活跃星系、喷流；重力透镜；大尺度结构；牛顿宇宙学、宇宙的动力膨胀及温度发展历史；宇宙背景微波辐射；大霹雳核合成。
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The average abundance distributions of heavy elements in metal - poor stars can provide fairly direct and detailed information on the nucleosynthesis in every stage after the formation of galaxies . furthermore , it can put more accurate constraints on the chemical evolution of neutron - capture elements . the solution to this problem will have important effect on the solution to a series of problems about nuclear astrophysics and the galactic evolution 贫金属星的中子俘获元素丰度分布能提供星系形成后各个阶段核合成的较为直接和详细的信息，并为星系化学演化的研究提供更为准确的约束，这一问题的解决将对核天体物理及星系化学演化的一系列问题的解决产生重要影响。
