PROMPT NEUTRON DECAY CONSTANTS IN MULTIPLYING HYDROGENEOUS MEDIA
Technical Report
·
OSTI ID:4031501
The pulsed neutron technique for measurements in multiplying hydrogeneous media is discussed. Measurements were made on assemblies whose k/ sub eff/ was 0.2 to 1.0 where subcriticality was effected by reducing the physical size from the critical size rather than by inserting poison. The decay constants were calculated using the 1/v poison removal method, and the results are compared with measurements. Preliminary integral-type measurements of the neutron spectrum which exists in the assembly during the decay of the neutron pulse were obtained. These indicate that the spectrum is extremely "diffusion cooled." A crude two-group calculation relates the decay constant to a spectral difference between the steady state and decaying state and indicates that the decaying-state spectrum should be softer than the steady-state spectrum. The limitations and possible applications of measurements in the far subcritical region are discussed. (auth)
- Research Organization:
- Knolls Atomic Power Lab., Schenectady, N.Y.
- DOE Contract Number:
- W-31-109-ENG-52
- NSA Number:
- NSA-15-016304
- OSTI ID:
- 4031501
- Report Number(s):
- KAPL-M-SIB-i
- Country of Publication:
- United States
- Language:
- English
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