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The A(y) problem for p-3He elastic scattering.

M Viviani1, A Kievsky, S Rosati

  • 1INFN, Sezione di Pisa, I-56100 Pisa, Italy.

Physical Review Letters
|May 1, 2001
PubMed
Summary
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Modern quantum calculations fail to accurately predict proton analyzing power in low-energy p-3He scattering. This underprediction highlights a persistent challenge in nuclear physics calculations for few-nucleon systems.

Area of Science:

  • Nuclear Physics
  • Quantum Mechanics
  • Few-Body Systems

Background:

  • Accurate theoretical models are crucial for understanding nuclear interactions.
  • Discrepancies between theory and experiment in nucleon-deuteron scattering are well-documented.
  • Proton-helium-3 (p-3He) scattering provides a key test for nuclear models.

Purpose of the Study:

  • To investigate the accuracy of modern quantum calculations for proton-3He elastic scattering.
  • To compare theoretical predictions with new experimental data for analyzing powers.
  • To identify the source of discrepancies in low-energy nuclear scattering.

Main Methods:

  • Numerically accurate quantum calculations using modern internucleon forces.
  • Complex Kohn variational principle and hyperspherical harmonics techniques.

Related Experiment Videos

  • Full treatment of the Coulomb force in p-3He scattering.

    • Main Results:

    • Calculations significantly underpredict the measured proton analyzing power, A(y), at low energies.
    • Discrepancies of approximately 30% at 1.20 MeV and 40% at 1.69 MeV were observed.
    • Inclusion of the three-nucleon interaction did not resolve the disagreement.

    Conclusions:

    • Current theoretical approaches with modern internucleon forces are insufficient to describe p-3He analyzing powers.
    • The observed underprediction is analogous to issues found in proton-deuteron and neutron-deuteron scattering.
    • Further refinement of nuclear force models or calculation methods is required.