Investigation of the ^26Mg(p,γ)^27Al Reaction Rate

Details Investigation of the ^26Mg(p,γ)^27Al Reaction Rate Investigation of the ^26Mg(p,γ)^27Al Reaction Rate

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..ses..ac01r&link_type=abstract

American Physical Society, 66th Annual Meeting of the Southeastern Section of the American Physical Society November 7-9, 1999 C

Astronomy and Astrophysics

Astrophysics

Scientific paper

The ^26Mg(p,γ)^27Al reaction is part of the MgAl cycle and is important for nucleosynthesis in globular cluster red giant stars and also for stellar models describing ^26Al synthesis in our galaxy. There exists a substantial amount of information on the rates for many of the reactions involved in the MgAl cycle, however, most of these investigations were conducted using protons of energies Ep >= 150 keV. The influence of resonances on the reaction rates at lower proton energies, corresponding to lower stellar temperatures, are uncertain and therefore in need of further study. Unfortunately the yields of these astrophysically significant resonances would be immeasurably small with current experimental techniques. As an alternative, we have reanalyzed existing ^26Mg(^3He,d)^27Al data and have obtained spectroscopic factors, proton partial widths and resonance strengths for states of interest. We have also calculated an updated reaction rate for ^26Mg+p. The uncertainty in the rate is a factor of approximately 200 at T=60 MK. The greatest source of this uncertainty is the transferred orbital angular momentum for several states in which the quantum numbers are ambiguous. To ameliorate this problem, we have taken new ^26Mg(p,γ)^27Al data at the TUNL High Resolution Laboratory. Results will be discussed.

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