# The nucleardatapy toolkit for simple access to experimental nuclear data, astrophysical observations, and theoretical predictions

## TL;DR

The paper introduces nucleardatapy, a Python toolkit that simplifies access to nuclear data, astrophysical observations, and theoretical predictions for studying dense matter.

## Contribution

The novel contribution is the release of nucleardatapy, a unified and extensible Python toolkit for accessing and comparing nuclear and astrophysical data.

## Key findings

- The isospin asymmetry quadratic approximation is used to predict pressure compatible with gravitational-wave results.
- nucleardatapy provides a unified format for comparing nuclear-physics data and astrophysical observations.
- The toolkit supports predictions for uniform matter, correlations among nuclear properties, and measurements for finite nuclei and hypernuclei.

## Abstract

Systematic comparisons across theoretical predictions for the properties of dense matter, nuclear physics data, and astrophysical observations (also called meta-analyses) are performed. Existing predictions for symmetric nuclear and neutron matter properties are considered, and they are shown in this paper as an illustration of the present knowledge. Asymmetric matter is constructed assuming the isospin asymmetry quadratic approximation. It is employed to predict the pressure at twice saturation energy-density based only on nuclear-physics constraints, and we find it compatible with the one from the gravitational-wave community. To make our meta-analysis transparent, updated in the future, and to publicly share our results, the Python toolkit nucleardatapy is described and released here. Hence, this paper accompanies nucleardatapy, which simplifies access to nuclear-physics data, including theoretical calculations, experimental measurements, and astrophysical observations. This Python toolkit is designed to easily provide data for: (i) predictions for uniform matter (from microscopic or phenomenological approaches); (ii) correlation among nuclear properties induced by experimental and theoretical constraints; (iii) measurements for finite nuclei (nuclear chart, charge radii, neutron skins or nuclear incompressibilities, etc.) and hypernuclei (single particle energies); and (iv) astrophysical observations. This toolkit provides data in a unified format for easy comparison and provides new meta-analysis tools. It will be continuously developed, and we expect contributions from the community in our endeavor.