Data for: Reassessing isospin-resolved decay of the ³¹P giant dipole resonance: covariance-aware channel competition and cascade closure from archival γ-X-γ′ data

This dataset supports the manuscript “Reassessing isospin-resolved decay of the ³¹P giant dipole resonance: covariance-aware channel competition and cascade closure from archival γ-X-γ′ data.” It contains source-transcribed archival numerical values used in the quantitative reanalysis, including reaction thresholds, state-resolved proton and neutron partial strengths, transmission-factor values, derived machine-readable summary quantities, and the deterministic Python script used to reproduce the reported calculations and figures. The deposit does not contain new experimental measurements, synthetic experimental observations, event-level raw spectra, detector-response matrices, photon-flux logs, or original covariance matrices. Missing values in the archival source tables are retained as missing and are not imputed as zero. The historical experiment and its provenance are identified in the associated manuscript through the cited 1987 publication and EXFOR record. README_REPRODUCIBILITY.txt documents the reproducibility workflow; DATA_DICTIONARY.txt defines the tabulated variables; SOFTWARE_ENVIRONMENT.txt records the validated software environment; and MANIFEST_SHA256.txt provides file-integrity hashes. The Python workflow performs deterministic numerical reanalysis and figure generation from the deposited tabulated values.本数据集为手稿《重新评估³¹P巨偶极共振（Giant Dipole Resonance）的同位旋分辨衰变：基于存档γ-X-γ′数据的协方差感知通道竞争与级联闭合》提供支撑。数据集包含用于定量再分析的、从存档数据源转录的数值数据，涵盖反应阈值、态分辨质子与中子分强度、透射因子数值、可机器读取的衍生汇总统计量，以及用于复现报告中计算结果与图表的确定性Python脚本。 本存档数据集未包含新增实验测量数据、合成实验观测结果、事件级原始能谱、探测器响应矩阵、光子通量日志或原始协方差矩阵。存档源表格中的缺失值将予以保留，不会被补零填充。相关手稿通过引用1987年发表的文献与EXFOR记录，明确了该项历史实验及其来源信息。 README_REPRODUCIBILITY.txt 文档说明了可复现性工作流程；DATA_DICTIONARY.txt 定义了表格化变量；SOFTWARE_ENVIRONMENT.txt 记录了经过验证的软件运行环境；MANIFEST_SHA256.txt 提供了文件完整性哈希值。本Python工作流可基于存档的表格化数值，完成确定性数值再分析与图表生成工作。