Delayed-neutron energy spectra for thermal fission of U-235

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5426359

Tanczyn, R S

In separate experiments at the University of Lowell 1-MW Fission Reactor and 5.5-MV Van de Graaff Accelerator, thermal fission was induced in a U-235 lined hemispherical fission chamber. The resulting fission fragments were transferred by a helium-jet system to a low-background counting area where composite delayed-neutron energy spectra were measured as a function of time after fission. Neutron energies were determined by the time-of-flight technique using beta-neutron correlations for timing. Two types of scintillators were used for neutron detection: Li-6 glass sensitive to neutrons in the energy range 10-300 keV, and plastic Pilot U sensitive to neutrons in the range 100 keV - 2.0 MeV. Spectra over the neutron energy range 0.1-2.0 MeV were measured for eight different time intervals after fission, each time interval containing varying contributions for the Six-Groups of delayed neutrons. Two of the eight time intervals were chosen to contain significant contributions from the shortest lived Groups 5 and 6.

• Research Organization: Lowell Univ., MA (USA)
• OSTI ID: 5426359
• Country of Publication: United States
• Language: English

Related Subjects

652020* -- Nuclear Properties & Reactions
A=220 & above
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BARYONS
DATA
DELAYED NEUTRONS
ELEMENTARY PARTICLES
ENERGY SPECTRA
EXPERIMENTAL DATA
FERMIONS
FISSION
FISSION NEUTRONS
HADRON REACTIONS
HADRONS
INFORMATION
NEUTRON REACTIONS
NEUTRONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
NUMERICAL DATA
SPECTRA
TARGETS
THERMAL NEUTRONS
URANIUM 235 TARGET