The impact of the ^26Al^m(p,γ)^27Si reaction rate on the destruction of ^26Al in ONe novae

Details The impact of the ^26Al^m(p,γ)^27Si reaction rate on the destruction of ^26Al in ONe novae The impact of the ^26Al^m(p,γ)^27Si reaction rate on the destruction of ^26Al in ONe novae

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aps..dnp.hd005d&link_type=abstract

American Physical Society, 2007 Annual Meeting of the Division of Nuclear Physics, October 10-13,2007, abstract #HD.005

Physics

Nuclear Physics

Scientific paper

Evidence of ongoing nucleosynthesis of ^26Al (τ1/2 = 7.2 x 10^5 yr) in our galaxy has been observed in the form of the 1.809 MeV γ-ray resulting from ^25Mg(p,γ)^26Al^g.s.(β^+ νe)^26Mg^* [1]. The ^25Mg(p,γ) reaction can also produce ^26Al^m, the short lived (τ1/2 = 6.3 s), 0^+, isomeric state of ^26Al, which β^+-decays to ^26Mg^g.s. only and must be treated separately from ^26Al^ g.s. at peak temperatures typical in novae (T9 .1 - .35)[2]. Since ^26Al(p,γ)^ 27Si competes with the β^+-decay of ^26Al in novae, resonances in ^26Al^g.s./m(p,γ)^ 27Si may have a significant impact on ^26Al production. We have used the ^28Si(p,d)^ 27Si, ^28Si(^3He,α)^ 27Si^*(p)^ 26Al, and ^27Al(^3He,t)^ 27Si^*(p)^ 26Al reactions to study the ^26Al(p,γ)^ 27Si reaction. Several previously unpublished levels in ^27Si and proton decay branching ratios will be reported. Their impact on the ^26Al(p,γ)^ 27Si reaction rate and the nucleosynthesis of ^26Al in ONe novae will be discussed. [1] Diehl, R. et al., A&A, 449 (2006) 1025. [2] Ward, R.A. and Fowler, W.A., ApJ, 238 (1980) 266.

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