Abstract
Using the 27Al( 3He, t) 27Si reaction, we have located and measured accurate excitation energies for seven states in 27Si between the 26Al + p threshold and the lowest observed 26 Al( p, γ) 27 Si resonance. By examining the mirror states in 27Al via the 27Mg( 3He, d) 27Al and 26 Mg(α, t) 27 Al reactions, we find that in the 26AI + p channel there can be at most only one s-wave resonance that lies below the lowest directly observed resonance; this possible l = 0 resonance most probably corresponds to either the 7589, 7557 or 7533 keV state in 27Si. The remaining six states are most probably formed via l ⩾ 2 proton capture. Upper limits for the reduced proton widths of these states have been used to estimate an upper limit for the 26 Al( p, γ) 27 Si thermonuclear reaction rate.
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