[Mesa-users] about the decay rates of al26, al26-1 and al26-2

[amber lauer]

On Tue, Feb 6, 2018 at 9:31 AM, Ertao Li via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Dear all,
>
> I am trying to do some research about the abundance of Al26 by using the
> MESA. I have some questions about the decay rates of al26, al26-1 and al26-2,
> because they confuse me. Can anyone help please?
>
> Firstly, I noticed that the decay rates (stored in cache/*.bin) of  al26, al26-1 and al26-2
> are constant and do come from $MESA/data/rates_data/JINA_reaclib***. But,
> from the MESA instruction paper  apj 220 (2015) 15, page 32:
> \8. WEAK REACTIONS
> \The rates module provides weak reaction rates for
> \hundreds of isotopes. By default, when atoms are fully ionized,
> \these rates are based (in order of precedence) on the tabulations
> \of Langanke & Martínez-Pinedo...
>
> What I think is that MESA only creates the decay rates from JINA but
> doesn't use them, MESA uses the  $MESA/data/rates_data/weakreactions.tables
> to get the decay rates but doesn't save them.  Am I correct?
>
​
Hi Ertao, did you ever get a response to this privately? Because I'm
curious now too. I'm working on models which pull rates from a different,
unsupported library, and my list includes (in a single list) both regular
and weak rates. That leads me to believe it might be a similar case to the
default, which pulls both from REACLIB, and according to this detail you've
uncovered, probably overrides REACLIB's weak rates from those taken from
these papers.

Also, does anyone know why these papers, which seem to employ shell model
calculations, are favored over the accepted REACLIB rates, which do not?

-- 
Amber Lauer
Postdoctoral Researcher
Triangle University Nuclear Lab
Duke University
amber.lauer at tunl.duke.edu <amber.lauer at duke.edu>
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