Dependence of deep-inelastic processes on entrance channel asymmetry and excitation energy. [506 to 732 MeV, angular distribution]

Technical Report · Mon May 01 04:00:00 EDT 1978

DOI:https://doi.org/10.2172/6734495· OSTI ID:6734495

Schmitt, R P

The dependence of deep-inelastic processes on entrance channel asymmetry and on excitation energy was investigated. Thin targets of /sup nat/At, /sup 159/Tb, /sup 181/Ta and /sup 197/Au were bombarded with 620 MeV /sup 86/Kr ions. Additional measurements were performed on the reactions /sup nat/Ag + /sup 86/Kr and /sup 197/Au + /sup 86/Kr at 506 and 732 MeV incident energy. The energy spectra, the charge distributions and the angular distributions of these fragments were measured. At 620 MeV the energy spectra show that the distinction between quasi-elastic and deep-inelastic processes diminishes as the target mass is increased. The charge distributions, which are peaked at symmetry for /sup nat/Ag, tend to become increasingly asymmetric for the heavier systems. Likewise, the angular distributions exhibit a strong dependence on the entrance channel asymmetry. For the lightest system, /sup nat/Ag + /sup 86/Kr, the angular distributions are essentially forward peaked, aside from a separable quasi-elastic component. For the heaviest system, /sup 197/Au + /sup 86/Kr, the angular distributions are side-peaked. The transition between these two regimes occurs smoothly with increasing target mass. The results at 506 and 732 MeV show that the widths of the charge distributions are strongly dependent on the excitation energy. The angular distributions for the reaction /sup nat/Ag + /sup 86/Kr become increasingly more forward peaked at higher bombarding energies. The angular distributions for /sup 197/Au + /sup 86/Kr, which are strongly focused at 506 MeV, also tend to be more forward peaked at the highest incident energy. The results are interpreted by assuming that the projectile and target form an intermediate complex and that they exchange mass via a diffusion process. Because of the systematic nature of this study, the data should serve as a guide in the development of models of deep-inelastic processes.

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
• DOE Contract Number: EY-76-C-04-0789
• OSTI ID: 6734495
• Report Number(s): LBL-7168
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ASTATINE
ASYMMETRY
CHARGE DISTRIBUTION
CHARGED-PARTICLE REACTIONS
DEEP INELASTIC SCATTERING
DIRECT REACTIONS
DISTRIBUTION
ELEMENTS
ENERGY RANGE
ENERGY SPECTRA
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITATION
GOLD 197 TARGET
HALOGENS
HEAVY ION REACTIONS
INELASTIC SCATTERING
INTERACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
KRYPTON 86
KRYPTON ISOTOPES
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MASS
METALS
MEV RANGE
MEV RANGE 100-1000
NONMETALS
NUCLEAR REACTIONS
NUCLEI
PARTICLE INTERACTIONS
QUASI-ELASTIC SCATTERING
QUASI-FREE REACTIONS
SCATTERING
SILVER
SPECTRA
STABLE ISOTOPES
SYMMETRY
TANTALUM 181 TARGET
TARGETS
TERBIUM 159 TARGET
TRANSITION ELEMENTS