AZURE: An<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi></mml:mrow></mml:math>-matrix code for nuclear astrophysics

The paper describes a multilevel, multichannel $R$-matrix code, AZURE, for applications in nuclear astrophysics. The code allows simultaneous analysis and extrapolation of low-energy particle scattering, capture, and reaction cross sections of relevance to stellar hydrogen, helium, and carbon burning. The paper presents a summary of $R$-matrix theory, code description, and a number of applications to demonstrate the applicability and versatility of AZURE.