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Recent Advances in R-matrix Data Analysis

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Compound-Nuclear Reactions

Part of the book series: Springer Proceedings in Physics ((SPPHY,volume 254))

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Abstract

The analysis of resolved compound-nucleus resonances by the R-matrix method is a powerful technique. The existence of R-matrix data models can be proved for the case of Hamiltonians bounded inside some radial limit and when only two-body channels are open. Given the fit parameters of pole energies and partial widths, we have very compact representation of the energy and angular dependences for resonances and their backgrounds.

A recent series of collaboration meetings organized by the IAEA have focused attention on the verification of R-matrix codes, and on the validation of data fits using those codes. We have compared the results of codes from LLNL, LANL, ORNL, JAEA, CEA, along with Tsinghua and Notre Dame Universities, and report on the results of these comparisons for fitting A = 7 scattering data.

A method is demonstrated to include the absorption to higher-energy two-body and breakup channels with energy-dependent damping widths.

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Acknowledgements

This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344

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Authors and Affiliations

  1. Lawrence Livermore National Laboratory, Livermore, CA, USA

    Ian J. Thompson

Authors
  1. Ian J. Thompson
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Correspondence to Ian J. Thompson .

Editor information

Editors and Affiliations

  1. Lawrence Livermore National Laboratory, Livermore, CA, USA

    Jutta Escher

  2. Department of Physics, Yale University, New Haven, CT, USA

    Yoram Alhassid

  3. Lawrence Berkeley National Laboratory, Berkeley, CA, USA

    Lee A. Bernstein

  4. National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY, USA

    David Brown

  5. North Carolina State University, Raleigh, NC, USA

    Carla Fröhlich

  6. Los Alamos National Laboratory, Los Alamos, NM, USA

    Patrick Talou

  7. Lawrence Livermore National Laboratory, Livermore, CA, USA

    Walid Younes

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© 2021 This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply

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Thompson, I.J. (2021). Recent Advances in R-matrix Data Analysis. In: Escher, J., et al. Compound-Nuclear Reactions . Springer Proceedings in Physics, vol 254. Springer, Cham. https://doi.org/10.1007/978-3-030-58082-7_4

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