Structure of resonances in the Gamow burning window for the Al-25(p, gamma)Si-26 reaction in novae

作者：Doherty D T^*; Woods P J; Seweryniak D; Albers M; Ayangeakaa A D; Carpenter M P; Chiara C J; David H M; Harker J L; Janssens R V F; Kankainen A; Lederer C; Zhu S

来源：Physical Review C, 2015, 92(3): 035808.

DOI：10.1103/PhysRevC.92.035808

A gamma-ray spectroscopy study of excited states in Si-26 has been performed by using the Mg-24(He-3,n) reaction at a beam energy of 10 MeV. In particular, states have been studied above the proton threshold relevant for burning in the Al-25(p,gamma)Si-26 reaction in novae. This reaction influences the amount of Al-26 injected into the interstellar medium by novae, which contributes to the overall flux of cosmic gamma-ray emission from Al-26 observed in satellite missions. The present results point strongly to the existence of a 0(+) state at an excitation energy of 5890 keV lying within the Gamow burning window, which raises questions about the existence and properties of another, higher-lying state reported in previous experimental work. The existence of two such states within this excitation energy region cannot be understood within the framework of sd-shell-model calculations.

• 出版日期2015-9-17
• 单位中国地震局