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arXiv · 2603.27715

A finite-precision Lanczos-Golub-Welsch route to probability-table construction in resonance self-shielding

Beichen Zheng
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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.

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Beichen Zheng. 2026-03-29. A finite-precision Lanczos-Golub-Welsch route to probability-table construction in resonance self-shielding. https://arxiv.org/abs/2603.27715

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