2026 R-Matrix Workshop on Methods and Applications

The 2026 R-matrix workshop—held at Oak Ridge National Laboratory (ORNL), Oak Ridge, TN, USA on July 13–17, 2026—will focus on several topics specific to the  phenomenological R-matrix analysis of nuclear reactions with particular emphasis on  neutron induced reactions. Among these,
• theoretical advances such as breakup reaction models, fission channel in the R-matrix framework, secondary gamma reactions, relativistic R-matrix models, primary gammas, polarization observables,
• experimental techniques,
• recent R-matrix evaluation work having direct impact to application topic areas ranging from criticality safety applications and astrophysics,
• statistical methods of resonance parameters applied to unresolved resonance 
region

Novel optimization techniques devoted to uncertainty quantification and computational  methods implemented in R-matrix codes to improve nuclear data evaluation productivity will be one of the goals set for the 2026 R-matrix workshop.
 

The R-matrix workshop is an event taking place every three years and its aim is to  bring together students, early career researchers and specialists in the field utilizing  the R-matrix formalism. The workshop structure will be set up such that different topics 
for in-depth-analysis concepts are offered in each session.

This workshop is the third in person meeting of the R-matrix workshop series. Previous in person meetings were held at Ohio University (OU) in 2023 and in Santa Fe, New  Mexico organized by Los Alamos National Laboratory (LANL) in 2016 where the Rmatrix workshop series started.