[mesa-users] abundances of all isotopes

[Mathieu]

Thank you very much! This has been very helpful!

On 05/07/2014 10:13 PM, Bill Paxton wrote:
> just to be clear -- compound reactions are used to minimize the number of isotopes in order to maximize performance.  they are used in almost all cases currently.  if you look at the tests in star/test_suite you'll find basic.net, pp_extras.net, cno_extras.net, pp_and_cno_extras.net, co_burn.net, ecapture.net, o18_and_ne22.net, agb.net, and good old approx21.net along with a few others.   all of them use compound reactions.  these are referred to as "hardwired" nets in contrast to "soft" nets that do not use any compound reactions.   in the definition of a soft net just the set of isotopes are given, and the system then automatically adds all relevant reactions that use only the given isotopes --- there are no intermediate isotopes implicitly included; you give the full list.
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> i've included some example soft nets in previous mesa releases -- the "arnett" nets you mention are an example of that, but there are others too.   i've recently learned from Dave that his code actually adds a few other isotopes automatically, so the "arnett" nets are misnamed and not recommended for use in their current form -- sorry, my mistake.
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> here are some alternatives for you to consider -- these "mesa" nets are soft nets forming a series from small (48 isos) to very large.  you will of course need to see which if any might work for your application.   and keep in mind that the current release of mesa/star is not really ready to handle large nets.   that ability is something that is being actively developed and should hopefully appear soon in a public release.   meantime you can begin to experiment with these if you'd like.   feel free to design your own soft nets too --- it is just a matter of picking a set of isotopes.
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> On May 7, 2014, at 9:05 PM, Josiah Schwab wrote:
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>>>> The only case I'm aware of where that's not true is when you're using
>>>> compound reactions that assume equilibrium abundances for intermediates
>>>> species not included in the net.  (See the approx family of nets for an
>>>> example.)
>>>>
>>> Is the approx family the only one using compound reactions? What about the arnett family of networks? I guess the nets in the arnett family do not use compound reactions, but I am not sure.
>> Yes, I believe that is correct.  The arnett family of networks are "soft" nets, where one specifies a large set of isotopes and uses the the reactions that link them.
>>
>> Josiah
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