[Mesa-users] The branch ratio of 12C+12C

[辛文宇]

Hi, Pro. Timmes

Thanks for your detailed help with my question.

Here is another question.
Do you know the default branching ratio of 12C+12C reaction in MESA?
I give a total reaction rate of 12C+12C, the product of 23Mg, 23Na and
20Ne is determined. So MESA has the default ratio of 
12C+12C=> 23Na+p, 12C+12C=> 23Mg+n, 12C+12C=> 20Ne+alpha
Right? How much the branching ratio are or where can I find this?

Thanks,
Wenyu Xin  


> -----原始邮件-----
> 发件人: "Francis Timmes" <fxt44 at mac.com>
> 发送时间: 2022-08-31 23:03:36 (星期三)
> 收件人: "辛文宇" <wyxin at nao.cas.cn>
> 抄送: "Frank Timmes" <fxt44 at mac.com>, mesa-users <mesa-users at lists.mesastar.org>
> 主题: Re: [Mesa-users] The Module of Network in MESA
> 
> hi wenyu,
> 
> the guidance says
> 
> % cp $MESA_DIR/net/test/src/sample_net.f90 .
> 
> take a look at sample_net.f90. lines 293-294 say
> 
> ! instantaneous net energy generation rate
>          write(6,24) 'eps_nuc    =',eps_nuc, 'erg/g/sec'
> 
> one can/should explore if one does not immediately believe this comment.
> for example,
> 
> % cd $MESA_DIR/net
> % grep -r "subroutine net_get(" *
> public/net_lib.f90:      subroutine net_get( &
> 
> where line 639 of net_lib.f90 repeats the claim
> 
>         real(dp), intent(out) :: eps_nuc ! ergs/g/s from burning after including losses from reaction neutrinos
> 
> one can/should explore if one remains unconvinced.
> 
> note that neutrino losses from reaction and thermal sources are different.
> 
> fxt
> 
> 
> 
> 
> > On Aug 30, 2022, at 6:35 AM, 辛文宇 via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> > 
> > Dear MESA-users, 
> > 
> > 
> > 
> > I have compiled the Module of sample_net.f according to the illustration
> > 
> > in https://docs.mesastar.org/en/release-r21.12.1/using_mesa/just_a_module.html.
> > 
> > With a certian logT, logRho and composition, it can output a value of eps_nuc.
> > 
> > But I am not sure whether this value has subtracted the epsilon of neutrino loss,
> > 
> > or this value is only the epsilon of nuclear reaction? 
> > 
> > 
> > 
> > I want to calculate the ignition line according to each burning stage, like pgstar 
> > 
> > TRho profile plot. Such as the ignition of C burning is defined as the energy 
> > 
> > generation rate of C burning equals to the energy loss rate by neutrinos.
> > 
> > 
> > 
> > Thanks,
> > 
> > Wenyu Xin
> > 
> > _______________________________________________
> > mesa-users at lists.mesastar.org
> > https://lists.mesastar.org/mailman/listinfo/mesa-users
> > 
</mesa-users at lists.mesastar.org></mesa-users at lists.mesastar.org></fxt44 at mac.com></wyxin at nao.cas.cn></fxt44 at mac.com>