我国核天体物理前沿研究进展
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摘要
核天体物理是研究微观世界的核物理与研究宏观世界的天体物理融合形成的交叉学科,其主要研究目标是:宇宙中各种化学元素核合成的过程、时间、物理环境、天体场所及丰度分布;核反应(包括带电粒子、中子、光子及中微子引起的反应、β衰变及电子俘获)如何控制恒星的演化过程和结局。近十多年来获得的大量实验和理论研究使核天体物理研究进入了一个蓬勃发展的新阶段。文章总结了以兰州重离子加速器、北京串列加速器和国家天文台为基础,结合国际合作,在核天体物理研究领域对直接测量、间接测量、衰变测量、质量测量、理论计算、网络计算、天文观测等关键科学问题进行的研究进展。也展望了核天体物理的关键科学问题,这些关键问题包括:(1)在地面实验室、尤其是地下实验室开展天体物理能区重要热核反应截面的直接测量;(2)高能区带电粒子反应截面向天体物理能区的合理外推;(3)恒星平稳核燃烧阶段和爆发性天体事件中关键核反应截面的间接测量;(4)爆发性天体事件中所涉及的大量远离稳定线核素的质量、衰变特性和共振态性质的研究;(5)建立并不断完善核天体物理数据库,发展网络模拟程序,系统研究元素核合成的天体场所、丰度分布;(6)宇宙中铁以上元素的来源之谜。
Nuclear astrophysics is an interdisciplinary research field. It composes of nuclear physics, which studies micro phenomena, and astrophysics which studies macroscopic phenomena in our world. The main research goals of nuclear astrophysics are:(1) how, when and where chemical elements are synthesized and what is their final abundance distribution in the universe;(2) how nuclear processes(reactions induced by charged particles,neutrons, photons and neutrinos, beta decays and electron capture processes) determine the evolution and the ultimate fate of stars. At present, nuclear astrophysics has been developed into a new prosperous stage with a huge number of experimental and theoretical progresses. This paper summarized the current progress of nuclear astrophysics in China, in the subfiels of direct and indirect measurement of key reactions, measurement of mass and decay, as well as the theoretical calculation and network simulation. In present paper, the prospects to solve the key scientific nuclear astrophysics problems are represented. These key problems include(1) direct measurement of important reactions at astrophysical energies in the laboratory on the earth surface and in the underground laboratory;(2)extrapolation of cross sections at higher energies for the reactions induced by charged particles;(3)indirect measurement of key reactions in the hydrostatic and explosive nuclear processes;(4) study of the mass,the properties of decay and resonant states for the nuclides far from the stability line in explosive astrophysical events;(5) establish and improve the database for nuclear astrophysics, and develop network simulation codes, and systematically study astrophysical sites and abundance distribution of nucleosynthesis;(6) origin of the elements heavier than iron in the universe.
Nuclear astrophysics is an interdisciplinary research field. It composes of nuclear physics, which studies micro phenomena, and astrophysics which studies macroscopic phenomena in our world. The main research goals of nuclear astrophysics are:(1) how, when and where chemical elements are synthesized and what is their final abundance distribution in the universe;(2) how nuclear processes(reactions induced by charged particles,neutrons, photons and neutrinos, beta decays and electron capture processes) determine the evolution and the ultimate fate of stars. At present, nuclear astrophysics has been developed into a new prosperous stage with a huge number of experimental and theoretical progresses. This paper summarized the current progress of nuclear astrophysics in China, in the subfiels of direct and indirect measurement of key reactions, measurement of mass and decay, as well as the theoretical calculation and network simulation. In present paper, the prospects to solve the key scientific nuclear astrophysics problems are represented. These key problems include(1) direct measurement of important reactions at astrophysical energies in the laboratory on the earth surface and in the underground laboratory;(2)extrapolation of cross sections at higher energies for the reactions induced by charged particles;(3)indirect measurement of key reactions in the hydrostatic and explosive nuclear processes;(4) study of the mass,the properties of decay and resonant states for the nuclides far from the stability line in explosive astrophysical events;(5) establish and improve the database for nuclear astrophysics, and develop network simulation codes, and systematically study astrophysical sites and abundance distribution of nucleosynthesis;(6) origin of the elements heavier than iron in the universe.
引文
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[6]SHI J R,TAKADA-HIDAI M,TAKEDA Y,et al.Astrophys J,2016,755:36.
[7]SU J,LIU W P,ZHANG N T,et al.Phys Lett B,2016,756:323.
[8]TU X L,XU H S,WANG M,et al.Phys Rev Lett,2011,106:112501.
[9]YAN X L,XU H S,LITVINOV YU A,et al.Astrophys J,2013,766:L8.
[10]HE J J,CHEN S.Z,ROLFS C E,et al.Phys Lett B,2013,725:287.
[11]LI C K,RYUTOV D D,HU S X,et al.Phys Rev Lett,2013,111:235003.
[12]BUCHER B,TANG X D.Phys Rev Lett,2015,114:251102.
[13]SU J,LIU W P,SHU N C,et al.Phys Rev C,2013,87:024312.
[14]HE J J,XU S W,MA P,et al.Nucl Instr Meth A,2012,680:43.