| 单词 | exponential pile |
| 释义 | > as lemmasexponential pile exponential pile n. Nuclear Physics (now chiefly historical) an assembly of fissionable and moderating materials, which is given an independent source of neutrons and used for experimental work, although too small to sustain a chain reaction; = exponential reactor n.So named because the neutron density was found to vary exponentially through the assembly: see quot. 1945. ΚΠ 1944 T. Arnette et al. Preliminary Rep. Exponential Exper. Water-metal Rod Lattices (U.S. Atomic Energy Comm.) 6 Table I summarizes the results of the exponential pile covered in our report. 1945 H. D. Smyth Gen. Acct. Devel. Atomic Energy Mil. Purposes vi. 58 By this time [sc. 1942] it was known that the neutron density decreased exponentially with increasing distance from the neutron source (hence the name often used for experiments of this type, ‘exponential pile’). 2009 J. P. Delgado Nucl. Dawn ii. 36 The exponential piles allowed Fermi and his team to increase, slowly and a step at a time, the size of the pile. < as lemmas |
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