[mesa-users] How I change nuclear reaction rate and list of mesa?
Francis Timmes
fxt44 at mac.com
Mon Feb 15 22:31:15 EST 2016
thanks for clarifying.
i suggest learning how to use the reaction networks that are already provided,
from the smaller to the larger networks to the adaptive networks. for this you
do no need to do any programming nor modify a reaclib data file.
the test suite problem
star/test_suite/nova
can be a place to start learning how to change mesa’s networks.
also instructive is
ed brown’s 2013 mesa summer school material
http://mesastar.org/teaching-materials/2013-mesa-summer-school/view
andrew cumming’s 2015 mesa summer school material
http://mesastar.org/teaching-materials/2015-mesa-summer-school
for burning on the surfaces of neutron stars.
so the first step is for you to learn how to use mesa’s
existing, flexible network & reaction rate capabilities.
fxt
> On Feb 15, 2016, at 9:44 PM, Park Byeong-Chan <allmest at unist.ac.kr> wrote:
>
> Hello, fxt. Thank you for your attention.
>
>
> I planned to study burst phenomenon on a surface of high-density star like the white dwarf, nova, or neutron star using known all nuclear reaction as possible, hence I think that I must know how nuclear reaction process of mesa operates in view of programming.
>
>
> 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 : 2016/02/15 10:40
>
>
> 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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