[mesa-users] How I change nuclear reaction rate and list of mesa?

[Francis Timmes]

hi park,

describe a bit more what you actually want to do.

editing the reaclib reaction rate data is probably not 
what you should be doing. there are easier and better 
routes to either adding isotopes to a network or 
changing the reaction rate.

fxt




> On Feb 15, 2016, at 12:40 PM, Robert Farmer <rjfarmer at asu.edu> wrote:
> 
> Hi
> 
> > I undetstand 1.0086649 is mass of the isotope, 0 and 1 is their proton number and neutron number repectively, and 0.5 is total spin number. But I can't understand what means 8.071317673 and below 24 numbers.
> 
> So if you look in the same folder as the isotope.data file ($MESA_DIR/data/chem_data) there is a readme file that tells you the format:
> 
> name       A       Z    N     spin   mass_excess
>       partition function coefficients for REACLIB
> 
> so the 8.071317673 mass excess and the next 24 numbers are for REACLIB
> 
> 
> >second, what means the each reaction index in reaction network?
> 
> So split the ap into two letters a and p, then the first letter is an input to the reaction and the second is an output, in this case we have a alpha (a) particle in and a proton (p) out. The others are gamma rays (g) and neutrons (n)
> 
> So some examples:
> r_he3_ag_be7
> is 
> he3+alpha -> be7+ gamma ray
> 
> r_li7_pa_he4
> is
> li7 + proton -> alpha +he4 (really just 2*he4)
> 
> r_c12_pg_n13
> is
> c12 + proton -> gamma ray + n13
> 
> Rob
> 
> 
> 
> On Mon, Feb 15, 2016 at 2:39 AM, 박병찬 <allmest at unist.ac.kr> wrote:
> Thanks, Rob.
> 
>  
> I checked isotope list (isotope.data) in mesa with your answer. I understand that I can make additional nuclear reaction using the names in the isotope list, however, I still need more information.
> 
>  
> first, in the isotope.data, what is the meaning of numbers?
> 
> for example, in case of neutron in the isotope.data,
> 
>  
> neut        1.0086649    0    1   0.5   8.071317673
>  1.00000E+00  1.00000E+00  1.00000E+00  1.00000E+00  1.00000E+00  1.00000E+00  1.00000E+00  1.00000E+00
>  1.00000E+00  1.00000E+00  1.00000E+00  1.00000E+00  1.00000E+00  1.00000E+00  1.00000E+00  1.00000E+00
>  1.00000E+00  1.00000E+00  1.00000E+00  1.00000E+00  1.00000E+00  1.00000E+00  1.00000E+00  1.00000E+00
> 
>  
> I undetstand 1.0086649 is mass of the isotope, 0 and 1 is their proton number and neutron number repectively, and 0.5 is total spin number. But I can't understand what means 8.071317673 and below 24 numbers.
> 
>  
> second, what means the each reaction index in reaction network?
> 
> I know what means ec, wk, pg but I don't know the others (ap, ag, an and etc). Of course it is to know that the reaction change proton number and neutron number of isotope, but I want to know details.
> 
>  
> Best regards
> 
> Park
> 
>  
> ------------ 원본 메일 내용 ------------
> 보낸 사람 : "Robert Farmer"<rjfarmer at asu.edu>
> 받는 사람 : "박병찬" <allmest at unist.ac.kr>
> 참      조 : "mesa-users at lists.sourceforge.net users" <mesa-users at lists.sourceforge.net>
> 메일 제목 : Re: [mesa-users] How I change nuclear reaction rate and list of mesa?
> 보낸 날짜 : 2016/02/11 17:07
> 
> 
> Hi
> See http://mesa.sourceforge.net/star_job_defaults.html#nuclear_reactions
> 
> Specifically the change net controls. Then  look in $MESA_DIR/data/net_data/nets for a list of pre-compiled mesa networks, you can also make your own network by copying (and renaming) one of the files and adding/removing isotopes from it (some of them also show you how to change the reactions used as well as the isotopes), then use that name as in the new_net_name control.
> 
> Rob
> 
> On Thu, Feb 11, 2016 at 4:45 PM, 박병찬 <allmest at unist.ac.kr> wrote:
>  Dear mesa-users.
>  
> I began mesa few days ago. Because I want to simulate astrophysical burst phenomena happened in more complex situation I need to change nuclear reaction network and its properties. As part of this work, I check most of mesa files from inlist files to data files located in $MESA_DIR/star/data but I can't find suitable way how I approach this work.
> 
>  
> Thus I want to recieve your advice as regard this work.
> 
>  
> Best regards
> 
> Park
> 
> 
> 
>  
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