Year
1970
Degree Name
Doctor of Philosophy
Recommended Citation
Ritchie, A. I.M., The variation with space and time of the neutron energy distribution in pulsed BeO assemblie, Doctor of Philosophy thesis, , University of Wollongong, 1970. https://ro.uow.edu.au/theses/2122
Abstract
Time dependent spatial distributions have been measured in -2 -2 BeC assemblies covering the buckling range 0.0083 cm to 0.0399 cm , referred to a density of 2.96 gm cm . This buckling range covers assemblies with decay curves that can be described by a discrete decay constant ( X ^ X*)^ a pseudodiscrete decay constant C\*< X X^) and a decay constant that changes with time (X > /V ). It was found K that the extrapolated length derived from these spatial distributions \ v^ -2 did not change with time if A < A . At a buckling of 0,0292 cm , (X-^X^), the extrapolated length changed by (0. 5 ^ 0. 25)per cent./1,000 us in the time range 1.4 ms to 2.9 ms and by (2„0-0.5)per cent.71,000 ps over a similar time range Tlie decay consta nta t oft het hel arngexets t hbiughcekrl insgpa, ti0a.l0 39m9o dec m"( th,e ( A2 1>1 A K ). 2 mode) did not lie on the X(B ) curve of the fundamental. In the region X < A < X„ the decay constants were in general higher than those for
Unless otherwise indicated, the views expressed in this thesis are those of the author and do not necessarily represent the views of the University of Wollongong.