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D E M Hoff1, R J Charity1, K W Brown1

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We observed significant spin alignment in excited Lithium-7 projectiles during inelastic scattering experiments. This alignment, independent of the target material, suggests a universal mechanism in nuclear reactions.

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Area of Science:

  • Nuclear Physics
  • Atomic and Molecular Physics

Background:

  • Investigating the behavior of excited nuclei is crucial for understanding nuclear structure and reaction dynamics.
  • Previous studies have explored projectile excitation but often focused on different energy regimes or reaction types.

Purpose of the Study:

  • To investigate the spin alignment of Lithium-7 projectiles following inelastic scattering.
  • To identify the underlying mechanism responsible for the observed spin alignment.
  • To determine the target independence of this phenomenon.

Main Methods:

  • Studying the sequential breakup of Lithium-7 projectiles at an energy of 24.0 MeV/nucleon.
  • Utilizing inelastic interactions with Carbon, Beryllium, and Aluminum target nuclei.
  • Analyzing peripheral events where the target nucleus remains unexcited.

Main Results:

  • Observed very large spin alignment of excited Lithium-7 projectiles, oriented longitudinally along the beam axis.
  • Demonstrated that this spin alignment is independent of the target nucleus (C, Be, Al).
  • Proposed a novel alignment mechanism attributed to an angular-momentum-excitation-energy mismatch.

Conclusions:

  • The observed spin alignment is a robust phenomenon in Lithium-7 projectile excitation.
  • The proposed mismatch mechanism offers a universal explanation for spin alignment in various scattering experiments.
  • This finding has implications for understanding nuclear interactions and projectile behavior.