Elsevier

Nuclear Physics A

Volume 436, Issue 3, 8 April 1985, Pages 561-572
Nuclear Physics A

Proton threshold states in 26Al

https://doi.org/10.1016/0375-9474(85)90086-7Get rights and content

Abstract

The energy levels of 26Al between Ex = 6.3 and 6.5 MeV, corresponding to proton threshold energies in the 25Mg + p reaction from Ep = 0 to 200 keV, have been investigated using the reactions 27Al(su3He, α)26Al and 24Mg(3He, p)26Al. Despite early work reporting a doublet at Ex = 6346 keV and Ex = 6362 keV, most subsequent work reported a single state with conflicting spin and parity assignments. Our work clearly establishes the presence of the doublet and resolves the conflicts. We find that there are six states in this excitation energy region, including a new state at Ex = 6410 ± 5 keV. The l-values leading to possible spin and parity assignments for all these states have been made using DWBA. We conclude however that only three of these six states may contribute to the production of 26Al by the 25Mg(p, γ) reaction in the MgAl cycle and the new structure of 26Al reported here can substantially increase the production rate of 26Al in stellar reactions.

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    Present address: Johannes-Gutenberg Universitaet Mainz, Institut fuer Kernchemie, Postfach 3980, 6500 Mainz, West-Germany.

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