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On the Feasibility of Measuring Higher Time Decay Constants

Ajoy K. Ghatak and Henry C. Honeck

Nuclear Science and Engineering

Volume 21 / Number 2 / February 1965 / Pages 227-239


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An extensive series of calculations has been performed to study the approach to equilibrium of a neutron pulse in water and graphite. All calculations are based on multigroup diffusion theory with space dependence represented by the DB2 term. The time dependence of the neutron density, following a neutron burst at t = 0, is obtained by solving explicitly the time- and energy-dependent diffusion equation. The decay constants are thereafter computed and compared with the true eigenvalues of the scattering operator. Wherever possible, the theoretical calculations are compared with experiments.

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