delayed neutron fraction

delayed neutron fraction

[di′lād ¦nü‚trän ‚frak·shən]
(nuclear physics)
The ratio of the mean number of delayed fission neutrons per fission to the mean total number of neutrons (prompt plus delayed) per fission.
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References in periodicals archive ?
Taking into account the fact that the effective delayed neutron fraction, [[beta].sub.eff], of the core is 0.0081, the [k.sub.eff] values correspond to the excess reactivity of about 9.81$.
In this process, the following parameters are calculated: the delayed neutron fraction yield in each precursor group and its decay rate, where the effective neutron fraction ([[beta].sub.ef]) is the sum of the delayed neutron fraction precursors ([[beta].sub.i]) in all groups.
Pepyolyshev, "Method of experimental estimation of the effective delayed neutron fraction and of the neutron generation lifetime in the IBR-2 pulsed reactor," Annals of Nuclear Energy, vol.
(iii) Sensitivity and uncertainty calculations of the effective delayed neutron fraction ([[beta].sub.eff]) [28-30].
The effective delayed neutron fraction is a key reactor safety parameter involved in the control rods worth calculations and transient (reactivity feedback effect) studies.
The measurements were performed on critical eigenvalue ([k.sub.eff]), and material buckling, reaction rate ratios, material worth, fission rate, and capture rate distributions as well as effective delayed neutron fraction [[beta].sub.eff] were measured.
In the scope of the CHANDA project of the European Commission a sensitivity and uncertainty analysis of the neutron multiplication factor [k.sub.eff] and the effective delayed neutron fraction [[beta].sub.eff] was performed to identify the most important nuclear data for neutron-induced reactions for criticality calculations of the latest MYRRHA designs.
Kodeli, "Sensitivity and Uncertainty in the Effective Delayed Neutron Fraction [[beta].sub.eff] (Method & SNEAK-7A Example)," Proc.

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