Identification of new states in 26Si using the 29Si(3He,6He)26Si reaction and consequences for the 25Al(p,γ)26Si reaction rate in explosive hydrogen burning environments

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Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, Radiative Capture, Transfer Reactions, 20<=A<=38

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We have studied the 29Si(3He,6He)26Si reaction and have identified new states in 26Si at Ex=5.140(10), Ex=5.678(8) MeV, and Ex=5.945(8). Based on these measurements and other recent evidence, we suggest spin-parity assignments of 1+ for the 5.678 MeV state and 3+ for the 5.945 MeV state, which would account for all the ``missing'' unnatural parity states in 26Si in the excitation energy region important to hydrogen burning in novae. New reaction rates are presented for the 25Al(p,γ)26Si reaction based on this possible assignment of states.

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