Thermal Equilibration of 26Al

Details Thermal Equilibration of 26Al Thermal Equilibration of 26Al

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...556..970r&link_type=abstract

The Astrophysical Journal, Volume 556, Issue 2, pp. 970-978.

Astronomy and Astrophysics

Astronomy

14

Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Abundances

Scientific paper

In astrophysical environments, the long-lived (t1/2=0.72 Myr) ground state of 26Al can communicate with its short-lived (t1/2=6.35 s) first excited state through thermal excitations. The result is that the astrophysical half-life for 26Al can be much shorter than the laboratory value, which can have an impact on the amount of 26Al produced at high temperatures. We have reexamined the equilibration process using the results of new calculations of some of the key transition rates. In addition, we discuss a simple way of describing the behavior of 26Al in a stellar plasma and use this to better define the conditions where equilibration is expected to be important. Finally, we present a series of network calculations to show how the interplay between the timescale for equilibration versus that for nuclear reactions will govern the evolution of 26Al.

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