Studies of heavy-ion reactions and transuranic nuclei. Progress report, September 1, 1991--August 31, 1992

Technical Report · Sat Aug 01 04:00:00 EDT 1992

OSTI ID:10178551

Schroeder, W U

Developments around the fictitious phenomenon of ``cold`` deuterium fusion are summarized. Investigations of the decay of Dy composite systems formed in {sup 32}S-induced fusion reactions provide no evidence for entrance-channel memory effects. Experimental and theoretical studies of excitation energy division in dissipative reactions are reviewed. Exclusive measurements of neutrons, light charged particles and massive fragments conducted for the very-heavy-ion reactions {sup 209}Bi+{sup 136}Xe and {sup 197}Au+{sup 2}Pb at Fermi energies have yielded several new observations. They affirm the effectiveness of the associated- neutron multiplicity as an indicator of dissipated energy and impact parameter. In spite of the elevated incident energies, both reactions are demonstrated to have a binary dissipative character leading to two primary fragments which subsequently decay, for peripheral as well as for central collisions. Atomic-number distributions of the primary fragments reconstructed from the decay products show evidence for multi-nucleon exchange, ruling out participant-spectator reaction scenarios. Correlations observed between deflection angle and dissipated energy in the {sup 209}Bi+{sup 136}Xe reaction indicate the onset of orbiting. Intermediate-mass fragments are emitted mostly sequentially but also in a process reminiscent of neck rupture. In each of the very-heavy-ion-reactions studied, only a fraction of the initial kinetic energy is dissipated. The development of the new, highly efficient Super Ball neutron calorimeter is discussed.

• Research Organization: Rochester Univ., NY (United States). Dept. of Chemistry
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-88ER40414
• OSTI ID: 10178551
• Report Number(s): DOE/ER/40414--5; ON: DE92040457
• Country of Publication: United States
• Language: English

Related Subjects

440101
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
663450
663570
663580
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700360
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
A = 150-189
A = 190-219
DESIGN
FUSION REACTIONS
GENERAL DETECTORS OR MONITORS AND RADIOMETRIC INSTRUMENTS
GEV RANGE 01-10
HEAVY ION FUSION REACTIONS
HEAVY ION REACTIONS
HEAVY NUCLEI
HEAVY-ION-INDUCED REACTIONS AND SCATTERING
LIQUID SCINTILLATION DETECTORS
NEUTRON DETECTION
NUCLEAR REACTION KINETICS
PROGRESS REPORT
RESEARCH PROGRAMS
SHOWER COUNTERS
THERMONUCLEAR REACTIONS
TRANSURANIUM ELEMENTS