星际^（26）Al核合成研究面临的困难──核天体物理学的重大疑难问题  

DIFFICUITIES ON STUDY OF ISM￣(26)AL AND A POSSIBLE NEW WAYTO NUCLEOSYNTHESIZE￣(26)AL-SNI_A

作　　者：彭秋和[1] 

机构地区：[1]南京大学天文系

出　　处：《物理学进展》1995年第1期79-113,共35页Progress In Physics

基　　金：国家"八五"攀登计划资助项目以及国家自然科学基金

摘　　要：介绍了有关星际￣（２６）Ａｌ（衰变伴随１．８０９ＭｅＶγ射线）的空间观测结果；讨论了与￣（２６）Ａｌ及其有关放射性核素（￣（２２）Ｎａ）的核反应链及其最近核物理实验进展；并由此分析了目前关于星际￣（２６）Ａｌ起源的各种天体模型面临的困难。最后，作者提出一种产生星际￣（２６）Ａｌ的新的可能的途径与Ｉａ型超新星模型的设想。Some observational restllts of the 1.809 Mev gamma-ray emitted by decay of the inter-stellar medium(ISM)￣(26)Al,which are obtained by spacecrafts during(1979-1992).are firstly in-troduced in the review paper.Secondly,both MgAl chain and NeNa cycle of nuclear reactions arediscussed iii the text.Thirdly,some new experiments of nuclear physics,which are related withthe question of the ISM￣(26)Al(e. g. measurements of the cross section of the nuclear reactions in theMgAl chain and in the NeNa cycle)are intreduced.Then.comparing some experiments of nuclearphysics. some difficulties confronted on various models responsible for the ISM￣(26)Al are discussedin the text. The conclusions are:1)all of hydrostatic H-burning models(including the massive MSstars,WR stars aiid the AGB stars)and all current nova models are hard to provide enoughISM￣(26)Al to be detected,2)SNⅡ+SNⅠ_b models are promising on responsibility for the half ofISM￣(26)Al,aIthough ctirrent SN Ⅱ+SNⅠ_b models should be improved,besides. Proposal of a new way to nucleosynthesizse￣(26)Al, ￣(14)N+￣(16)O→￣(26)Al+α,is suggested.SNⅠ_a as apossible source of the ISM￣(26)Al is discussed in this paper. This research is supported by both the National Grand Project‘Chimbing Up and the National’and tbe National NaturalScience Foundation of China.

关 键 词：星际 铝同位素核 合成 核天体物理学 疑难问题 

分 类 号：P142[天文地球—天体物理]