Charge-Changing Cross Sections from the Fragmentation of Relativistic Krypton and Silver Nuclei.

Details Charge-Changing Cross Sections from the Fragmentation of Relativistic Krypton and Silver Nuclei. Charge-Changing Cross Sections from the Fragmentation of Relativistic Krypton and Silver Nuclei.

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........15n&link_type=abstract

Thesis (PH.D.)--UNIVERSITY OF MINNESOTA, 1994.Source: Dissertation Abstracts International, Volume: 55-07, Section: B, page: 280

Physics

Nuclear Physics

3

Scientific paper

The fragmentation of ultraheavy nuclei is of great interest in cosmic ray and nuclear physics. The charge -changing cross sections are measured for the fragmentation of krypton and silver nuclei on targets of hydrogen, polyethylene, lithium, carbon, aluminum, copper, tin, and lead at energies from 450 to 1500 MeV/nucleon. The detector system used in these measurements and the method used in determining the charge-changing cross sections are described. New energy independent and dependent models of the total charge-changing cross sections are introduced. The need to introduce electron measured nuclear radius to describe the interactions over the large range of beams and targets is demonstrated. Using the measured nuclear radii eliminates the need to use an effective hydrogen mass or radii. A simple hard sphere model with a constant overlap term is adequate, when using the measured nuclear radii, to describe the beam and target dependence of the total charge-changing cross sections. A new form of the partial charge-changing cross sections on heavy targets is introduced. The new krypton and silver partial cross sections are compared to earlier models and new parameters values are found when appropriate. No evidence is found at these energies for limiting fragmentation or factorization of the partial cross sections. The charge -changing cross sections on targets heavier than hydrogen follow a power law unlike the hydrogen containing targets. A study of the charge-pickup cross sections is made and the beam dependence is found to be dependent on the neutron excess rather than just the mass number.

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