Difficulties on study of ISM 26Al and a possible new way to nucleosynthesize 26Al-SNIa

Some observational results of the 1.809 MeV gamma-ray emitted by decay of the interstellar medium (ISM) 26Al, which are obtained by spacecraft during (1979-1992) are firstly introduced. Secondly, both Mg-Al chain and Ne-Na cycle of nuclear reactions are discussed. Thirdly, some new experiments of nuclear physics, which are related with the question of the ISM 26Al(e.g. measurements of the cross section of the nuclear reactions in the MgAl chain and in the NeNa cycle) are introduced. Then, comparing some experiments of nuclear physics, some difficulties confronted on various models responsible for the ISM 26Al are discussed. The conclusions are: 1) all of hydrostatic H-burning models and all current nova models are hard to provide enough ISM 26Al to be detected; 2) SN II + SN Ib models are promising on responsibility for the half of ISM 26Al, although current SN II + SN Ib models should be improved, besides. Proposal of a new way to nucleosynthesizse 26Al, 14N + 16O→26Al + α, is suggested. SNIa as a possible source of the ISM 26Al is discussed (63 refs.)