STUDY OF ANGULAR AND ENERGY DISTRIBUTIONS OF FISSION FRAGMENTS BY MEANS OF A MULTI-GRID IONIZATION CHAMBER
Technical Report
·
OSTI ID:4315904
The ionization chamber in question consists of two catheodes with grids and an anode at the center with a grid on ench side. The anode, which is a thin gold foil, contains a fine deposit of uramium on both sides. The whole system is insented into a container filled with pure argon. Thermal neutrors bombard the uranium. or there is a fission, the fragments are ejected in nearly opposite directions, that is, one on each side of the anode. The negative ions produced by the fragments are immediately collected by the anode and the pulse due to them after amplification is made to trigger off the time base of an oscillograph. The positive ions of the two fragments, on the other hand, are collected by their respective cathode sfter a certain delay. The positive ion pulses aiter suitable amplifications are given to the vertical plate of the oscillograph. The energy of each fragment is deduced from the height of the respective pulse. For the determination of the angle, it can be shown that for each fragment, the time of arrival of the first positive ion to the respective cathode is related to the angle between the direction of emission of the fragment and the direction of the incident particle. This relation can be expressed in terms of quantities which are measured from the photograph of the pulse. The experiment was made entirely automatic in the sense that the fission fragments are made to take their own photographs. In this way 4000 fragments due to 2000 fissioas were measured. The results obtained show that the angular distribution of fission fragments of natural uranium bombarded by thermal neutrons is isotropic. (auth)
- Research Organization:
- Pennsylvania State Univ., University Park. Osmond Lab.
- NSA Number:
- NSA-12-014916
- OSTI ID:
- 4315904
- Report Number(s):
- A/CONF.15/P/694
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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