Internal equilibration of a nucleus with metastable states

Details Internal equilibration of a nucleus with metastable states Internal equilibration of a nucleus with metastable states

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17045g&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

^26Al has a short lifetime of roughly just a Myr against beta decay and serves as an important tracer of galactic chemical evolution. However, it has a low-lying metastable state at 0.228 MeV whose decay to the ground state is inhibited by a high difference in angular momentum between those two states. In such situations, it has been customary to assume a thermal population of excited states to compute beta-decay rates. We present a new technique that follows the non-equilibrium evolution of the nucleus by splitting its excited states into two ensembles. This allows us to incorporate as many excited states as we wish into our nucleosynthesis network while simultaneously working with only two effective "species". Effective beta decay rates of ^26Al obtained using our technique are used in yield calculations appropriate to possible nucleosynthesis scenarios.

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