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Related Experiment Videos

Photoabsorption on 4He with a realistic nuclear force.

Doron Gazit1, Sonia Bacca, Nir Barnea

  • 1The Racah Institute of Physics, The Hebrew University, 91904 Jerusalem, Israel.

Physical Review Letters
|April 12, 2006
PubMed
Summary

This study calculates the helium-4 total photoabsorption cross section using advanced nuclear potentials. Three-nucleon forces significantly impact results, especially above 50 MeV.

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Area of Science:

  • Nuclear Physics
  • Quantum Chromodynamics

Background:

  • The photoabsorption cross section of helium-4 (4He) is crucial for understanding nuclear structure and interactions.
  • Realistic nucleon-nucleon potentials and three-nucleon forces (3NF) are essential for accurate nuclear calculations.

Purpose of the Study:

  • To calculate the 4He total photoabsorption cross section using the Argonne V18 nucleon-nucleon potential and the Urbana IX 3NF.
  • To rigorously include final state interactions and analyze the impact of 3NF on the cross section.

Main Methods:

  • Lorentz integral transform method for rigorous inclusion of final state interaction.
  • Calculation of the 4He total photoabsorption cross section with and without 3NF.

Main Results:

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  • A pronounced giant resonance was observed, with peak cross sections of 3.0 mb (with 3NF) and 3.2 mb (without 3NF).
  • Above 50 MeV, 3NF effects were significant, reaching up to 35%.
  • Good agreement with experimental data was found near the photoabsorption threshold.

    • Conclusions:

    • The study highlights the significant role of three-nucleon forces in the photoabsorption of 4He.
    • While agreement near threshold is good, experimental data in the giant resonance region is inconclusive for a definitive comparison.