Third Party Data#
pynucastro incorporates the following publicly-available third-party data. Links to this data as well as citations to the relevant publications are as follows.
Reaction rates#
Nuclear reaction rates from JINA Reaclib#
The reaction rate parameterizations in pynucastro/library were obtained from the JINA Reaclib database.
Cyburt et al. [2010]
Tabulated weak nuclear reaction rates#
For nuclei with \(A = 17\) to \(28\) we use the weak rates from Suzuki et al. [2016].
The data tables were obtained from https://www.phys.chs.nihon-u.ac.jp/suzuki/data2/link.html.
For nuclei with \(A = 45\) to \(65\) we use the weak rates from Langanke and Martínez-Pinedo [2001].
Physical constants#
We use the [scipy.constants](https://docs.scipy.org/doc/scipy/reference/constants.html) module from SciPy to get all the physical constants. This in turn gets the constants from the CODATA recommended values (currently CODATA 18)
Tiesinga et al. [2021]
Nuclei properties#
We get the basic nuclear properties from the Nubase 2020 evaluation. This is available online at Nuclear Data Services. We are currently using the file nubase_4.mas20.txt.
Kondev et al. [2021]
In particular, we get the mass excesses, \(\Delta m\), and spins from there. We then compute mass of the nucleus as:
and the binding energies from the mass excesses as:
where \(m_H\) is the mass of the hydrogen atom, computed from the mass
excess of 1H listed in the table. This is consistent with the
discussion in section 2 of the AME 2020 paper [Huang et al., 2021], and
these numbers match the binding energies computed in the AME tables to
the uncertainty in the nuclear masses.
Partition functions#
We use the tabulated partition functions from the following sources: