  The prompt neutron period (the negative reciprocal of the prompt neutron
decay constant) can be estimated using the Rossi-alpha technique that is
predicated on fitting Rossi-alpha histograms and of interest in nuclear
criticality safety and nonproliferation [1, 2, 3]. The histograms are
traditionally fit with a one-exponential model; however, recent work has
proposed a two-exponential model to account for reflector-induced phenomenon
[4, 5, 6]. Until recently, the uncertainty quantification for either model was
inadequate (inaccurate and demanded large measurement times). Measurement
uncertainty quantification by sample and analytic methods was developed and
validated in Ref. [7]. The purpose of this transaction is to (i) validate a new
bootstrap method by comparing bin-by-bin error bar estimates and (ii)
demonstrate how to choose bin widths and reset times to optimize precision and
accuracy.
