[mesa-users] MESA Network Question

Bill Paxton paxton at kitp.ucsb.edu
Fri Oct 5 12:41:31 EDT 2012

Hi Ryan,

"prot" is only for use in hardwired nets such as approx21.
it is used there for technical reasons to make the carefully
designed multi-step built in reactions work properly over 
the extreme range from H burning to core-collapse.

with add_isos_and_reactions you should not use prot -- just h1.

Keep in mind that you will need to provide all the isotopes involved
in any reaction chains you want included in your net.  There
aren't any multi-step reactions involved when you use add_isos_and_reactions.
It just adds all reactions that have all of their input and output isos included
explicitly.   as a simple example, if you include mg24 and si28, but not al27,
then you'll get mg24(a,g)si28 but you won't get mg24(a,p)al27(p,g)si28.
The latter is an example of a multi-step reaction that is in approx21
even though approx21 does not include al27.  The reactions involving al27 
will only be included by add_isos_and_reactions if you have explicitly 
included al27 in addition to mg24 and si28.

you undoubtedly knew all that, but it is worth repeating. ;-)

Frank Timmes can fill in more background about prot if you are curious.


On Oct 5, 2012, at 8:09 AM, Ryan Orvedahl wrote:

> Hello,
> I am using the MESA network in an external program with the 
> add_isos_and_reactions capability. What is the difference between h1 and 
> prot? Do I need to include both if I want to include protons in my network?
> Thanks,
> Ryan
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