Two-particle correlations at small relative momenta, measured for the reactions sup 14 N + Au at E/A = 35 MeV and sup 16 O + Au at E/A = 94 MeV

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6043465

Chen, Ziping

Single- and two-particle inclusive cross sections for light nuclei were measured for the reactions {sup 14}N + {sup 197}Au at E/A = 35 MeV and {sup 16}O + {sup 197}Au at E/A = 94 MeV. Two-particle correlation functions support the picture of formation and decay of a localized subsystem of high excitation. Kinetic temperature parameters, {tau}, extracted from the slopes of the kinetic energy spectra of the particles emitted from intermediate rapidity sources show a systematic trend with respect to the incident energy {tau} {approx} 10-12 MeV for {sup 14}N + {sup 197}Au at E/A = 35 MeV, {tau} {approx} 17-20 MeV for {sup 16}O + {sup 197}Au at E/A = 94 MeV. In contrast, the relative populations of states of light nuclei do not depend sensitively on incident energy and are consistent with emission temperatures of T {approx} 5 {plus minus} 1 MeV. For the {sup 14}N + Au reaction, quasi-elastic peripheral reactions and more violent fusion collisions were discriminated by measuring the folding angle between two coincident fission fragments resulting from the decay of the heavy reaction residue. Two-particle correlation functions, measured at {theta}{sub av} {approx} 20{degrees}, are more pronounced and more sensitive to the total kinetic energy of the coincident particles for fusion-like collisions as compared to peripheral collisions. Temporal effects could account for this observation. No dependence of relative populations of excited states on the folding angle was established. Statistical calculations were performed to evaluate the sequential decay of highly excited primary reaction products and the resulting perturbations of the relative populations of widely separated particle unbound states in light nuclei.

• Research Organization: Michigan State Univ., East Lansing, MI (USA)
• OSTI ID: 6043465
• Country of Publication: United States
• Language: English

Related Subjects

651920* -- Nuclear Properties & Reactions
A=190-219
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGED-PARTICLE REACTIONS
CORRELATION FUNCTIONS
CROSS SECTIONS
DIRECT REACTIONS
ENERGY RANGE
ENERGY SPECTRA
FISSION FRAGMENTS
FUNCTIONS
GOLD 197 TARGET
HEAVY ION REACTIONS
MEV RANGE
MEV RANGE 10-100
NITROGEN 14 REACTIONS
NUCLEAR FRAGMENTS
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
OXYGEN 16 REACTIONS
PRECOMPOUND-NUCLEUS EMISSION
QUASI-ELASTIC SCATTERING
QUASI-FREE REACTIONS
SCATTERING
SPECTRA
TARGETS
YIELDS