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Coupled-channel calculation of nonelastic cross sections using a density-functional structure model.

G P A Nobre1, F S Dietrich, J E Escher

  • 1Lawrence Livermore National Laboratory, P.O. Box 808, L-414, Livermore, California 94551, USA.

Physical Review Letters
|January 15, 2011
PubMed
Summary

This study details microscopic calculations for nucleon-nucleus scattering, accurately predicting reaction cross sections by including particle-hole excitations and pickup channels. These findings account for observed absorptions, advancing nuclear reaction understanding.

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Area of Science:

  • Nuclear Physics
  • Quantum Mechanics
  • Computational Physics

Background:

  • Nucleon-nucleus scattering is crucial for understanding nuclear structure and reactions.
  • Previous models often simplified the complex interactions and excitations involved.
  • Accurate reaction cross-section calculations are essential for nuclear astrophysics and applications.

Purpose of the Study:

  • To perform microscopic calculations of reaction cross sections for nucleon-nucleus scattering.
  • To investigate the role of particle-hole excitations and nucleon pickup channels.
  • To provide a comprehensive explanation for observed absorptions in scattering processes.

Main Methods:

  • Coupling the elastic channel to particle-hole excitations and one-nucleon pickup channels.
  • Utilizing a random-phase approximation framework with a Skyrme functional for target excitations.
  • Calculating reaction cross sections for specific isotopes (Ca, Ni, Zr, Sm).

Main Results:

  • Calculated reaction cross sections show excellent agreement with experimental data.
  • Predictions align well with results from fitted optical potentials.
  • Inelastic state couplings were found to be negligible, but pickup channels significantly contribute.
  • Explicit channel coupling fully accounts for observed absorptions between 10-40 MeV.

Conclusions:

  • The microscopic approach successfully describes nucleon-nucleus scattering observables.
  • Particle-hole excitations act as doorway states influencing reaction dynamics.
  • Nucleon pickup channels are critical for accurate cross-section predictions.
  • This work provides a complete explanation for absorption phenomena in the studied energy range.