Excitation functions for complex fragment emission in the E / A =20--100 MeV sup 14 N+@Ag, sup 197 Au reactions

Journal Article · Fri May 01 04:00:00 EDT 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.45.2300· OSTI ID:7235160

Wile, J L; Fields, D E; Kwiatkowski, K; Yennello, S J; Morley, K B; Renshaw, E; Viola, V E ^[1]; Gelbke, C K; Lynch, W G; Carlin, N; Xu, H M; Gong, W G; Tsang, M B; Pochodzalla, J; deSouza, R T; Fields, D J; Austin, S M ^[2]

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1. Departments of Chemistry and Physics and Indiana University Cyclotron Facility, Indiana University, Bloomington, Indiana 47405 (United States)
2. Department of Physics and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)

Excitation functions have been measured for complex fragments with atomic number {ital Z}=3--15 emitted in collisions of {ital E}/{ital A}=20--100 MeV {sup 14}N ions with targets of {sup nat}Ag and {sup 197}Au. The results are analyzed in terms of a three-source model which includes: projectilelike fragments from peripheral processes, nonequilibrium emission, and statistical decay of fully equilibrated compound nuclei. Nonequilibrium emission of complex fragments is found to increase rapidly relative to equilibrium emission up to {ital E}/{ital A}{approx}60 MeV and then remain approximately constant thereafter. Evidence for enhanced production of heavier intermediate-mass fragments is found in the data for reactions with the {sup nat}Ag target at energies above {ital E}/{ital A}{approx}60 MeV. Fit parameters for the equilibrium and nonequilibrium sources are examined. In particular, it is observed that the temperature parameter for nonequilibrium emission of complex fragments is independent of bombarding energy up to {ital E}/{ital A}=100 MeV.

• OSTI ID: 7235160
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 45:5; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663560 -- Nuclear Mass Ranges-- A=90-149-- (1992-)
663580 -- Nuclear Mass Ranges-- A=190-219-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
ELEMENTS
ENERGY RANGE
EXCITATION FUNCTIONS
FUNCTIONS
GEV RANGE
GEV RANGE 01-10
GOLD 197 TARGET
HEAVY ION REACTIONS
METALS
MEV RANGE
MEV RANGE 100-1000
NITROGEN 14 REACTIONS
NUCLEAR FRAGMENTATION
NUCLEAR REACTIONS
SILVER
TARGETS
TRANSITION ELEMENTS