What question did this study set out to answer?

The aim is to provide a fast and unified package for accessing physical constants and particle properties.

February 2, 2026JACOW0 citationsOpen Access

AtomicAndPhysicalConstants.jl – A fast Julia package to access particle properties and fundamental constants

LLLixing Li ACAlexander Coxe DSDavid Sagan

Key Points

The aim is to provide a fast and unified package for accessing physical constants and particle properties.
Developed as a Julia package for efficient lookup of constants and properties.
Aggregated data from NIST and the Particle Data Group.
Supports customizable unit systems and data types.
Integrated with the Unitful.jl package for unit management.
Provides quick access to a wide range of physical constants and subatomic properties.
Enhances performance for simulations and modeling tasks in physics.
User-friendly interface that simplifies usage compared to traditional methods.

Abstract

To support constants lookup for the SciBmad project, we introduced AtomicAndPhysicalConstants.jl, a Julia package that provides physical constants, subatomic particle properties, and atomic isotope data. It aggregates datasets from NIST (CODATA) and the Particle Data Group, offering a unified interface. The package supports configurable unit systems and data types, and integrates with the Julia package Unitful.jl. The package emphasizes speed and ease of use, making it well-suited for high-performance simulations and physics-driven modeling.

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