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Microscopic fragmentation model for galactic cosmic ray studies.

F A Cucinotta1, J W Wilson, R K Tripathi

  • 1NASA, Langley Research Center, Hampton, VA 23681-0001, USA.

Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
|September 7, 2001
PubMed
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This study refines heavy ion fragmentation models for galactic cosmic ray (GCR) research. The new approach accurately models nuclear fragmentation and de-excitation, improving predictions for GCR composition.

Area of Science:

  • Nuclear Physics
  • Astrophysics
  • Cosmic Ray Physics

Background:

  • Existing heavy ion fragmentation models for galactic cosmic ray (GCR) studies have limitations.
  • These models often rely on simplified reaction dynamics or limited experimental data, neglecting nuclear cluster effects.

Purpose of the Study:

  • To develop improved theoretical models for heavy ion fragmentation relevant to GCR studies.
  • To re-formulate the abrasion-ablation model to better describe nuclear excitation spectra.
  • To provide an analytic solution for nuclear de-excitation processes.

Main Methods:

  • Re-formulating the abrasion-ablation description of fragmentation.
  • Analyzing the excitation spectrum of pre-fragment nuclei.
  • Developing an analytic solution for nuclear de-excitation using realistic nuclear level spectra.
Keywords:
NASA Discipline Radiation Health

Related Experiment Videos

  • Comparing model predictions with experimental data for various ion beams and targets.

    • Main Results:

    • The reformulated model provides a more accurate description of the excitation spectrum of pre-fragment nuclei.
    • The study presents an analytic solution for nuclear de-excitation, incorporating realistic nuclear level densities.
    • Comparisons with experimental fragmentation data for 24Mg, 32S, and 56Fe show good agreement.

    Conclusions:

    • The developed theoretical framework offers a more robust approach to modeling heavy ion fragmentation for GCR studies.
    • The improved models enhance our understanding of GCR propagation and composition.
    • This work provides a foundation for more accurate predictions of cosmic ray interactions in space.