Studies of heavy-ion reactions and transuranic nuclei. [Univ. of Rochester]

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

OSTI ID:7108778

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: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-88ER40414
• OSTI ID: 7108778
• Report Number(s): DOE/ER/40414-5; ON: DE92040457
• Country of Publication: United States
• Language: English

Related Subjects

440101 -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663570 -- Nuclear Mass Ranges-- A=150-189-- (1992-)
663580 -- Nuclear Mass Ranges-- A=190-219-- (1992-)
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700360 -- Fusion Reactions-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGED-PARTICLE REACTIONS
DESIGN
DETECTION
DOCUMENT TYPES
ELEMENTS
ENERGY RANGE
GEV RANGE
GEV RANGE 01-10
HEAVY ION FUSION REACTIONS
HEAVY ION REACTIONS
HEAVY NUCLEI
KINETICS
LIQUID SCINTILLATION DETECTORS
MEASURING INSTRUMENTS
NEUTRON DETECTION
NUCLEAR REACTION KINETICS
NUCLEAR REACTIONS
NUCLEI
NUCLEOSYNTHESIS
PROGRESS REPORT
RADIATION DETECTION
RADIATION DETECTORS
REACTION KINETICS
RESEARCH PROGRAMS
SCINTILLATION COUNTERS
SHOWER COUNTERS
SYNTHESIS
THERMONUCLEAR REACTIONS
TRANSURANIUM ELEMENTS