A finite-precision Lanczos-Golub-Welsch route to probability-table construction in resonance self-shielding
Abstract
This work reformulates Chiba's affine-order prescription as a polynomial-moment problem for a transformed positive measure, and develops an alternative finite-precision construction route based on this reformulation. The proposed construction proceeds through discrete-measure realization, symmetric Lanczos reduction, and Golub--Welsch extraction, replacing the conventional moment--Pade pipeline. The subgroup total levels and probabilities are obtained by a Gauss-type compression step that preserves nonnegative-realness, while the reaction-channel levels are recovered on the compressed nodes by orthogonal-basis matching. In five tested resonance-channel cases, the proposed construction yields lower effective-cross-section errors and avoids the order-induced emergence of complex responses observed in the conventional construction.
Keywords
Cite
@article{arxiv.2603.27715,
title = {A finite-precision Lanczos-Golub-Welsch route to probability-table construction in resonance self-shielding},
author = {Beichen Zheng},
journal= {arXiv preprint arXiv:2603.27715},
year = {2026}
}