STUDIES OF U$sup 235$ FISSION IN COINCIDENCE WITH PROMPT FISSION $gamma$- RAYS

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1963

OSTI ID:4007897

Cooperman, E L

The fission fragments from thermal fission of /sup 235/U were investigated with regard to their kinetic-energy distnibution, mass distribution, mass ratio, and angular distribution. A modified Frisch gridded double ionization chamber was used, which contained a thin foil of plastic upon which / sup 235/U was deposited. The gas in the chamber consisted of approximates 93% A + 7% CO/sub 2/ operating at slightiy under atmospheric pressure and at saturation voltage. A 3" x 3" NaI(Tl) crystal was used as the gamma detector. The electron pulses produced by the fission fragments were collected at the anode in approximates .2 mu sec, and a coincidence circuit was set up between this pulse and the prompt fission gamma ray. The positive ion pulses were collected at their respective anodes in the order of a few msec, the time of collection depending upon the angle of emission of the fragments as well as the length of the ionization path produced. Thus, the energy, mass, and angle of emission of the fragments couid be obtained in coincidence with different prompt gamma radiation. An automatic recording circuit recorded the data, which was analyzed by an IBM 7074. Tests were run for gamma radiation >2 Mev and gamma > 3 Mev, and the resuits compared to all gamma 's (i.e., the standard double-humped energy curve). Pronounced structurat effects increasing with gamma energy were noticed in both the fission fragment kinetic energy and the mass ratio distribution. (Dissertation Abstr., 24: No. 8, Feb. 1964)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-18-021343
• OSTI ID: 4007897
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
CIRCUITS
COINCIDENCE METHODS
COMPUTERS
CRYSTAL COUNTERS
DIGITAL SYSTEMS
DISTRIBUTION
ELECTRON BEAMS
EMISSION
ENERGY
FISSION
FISSION PRODUCTS
FOILS
GAMMA DETECTION
GAMMA RADIATION
GASES
IBM 7074
ION BEAMS
IONIZATION
IONIZATION CHAMBERS
MASS
PHYSICS
PRESSURE
PULSES
RECORDING SYSTEMS
URANIUM 235
VELOCITY