Nuclear Science and Engineering / Volume 4 / Number 4 / October 1958 / Pages 570-575
Technical Paper / dx.doi.org/10.13182/NSE58-A28833
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The slowing down of neutrons by a monoatomic moderator gas with temperature can be expressed by a variational formalism. Using a suitable trial solution one can calculate the effective neutron temperature and the upper limit of the thermal region by variation. Results are given for large moderator masses and small absorption.