从准实光子散射中提取质子、中子、氘核和³He的σ_TT
Extraction of $σ_{TT}$ for Proton, Neutron, Deuteron and $^3$He from Quasi-real Photon Scattering
AI总结：
该研究通过外推电子散射数据至实光子点，结合弱束缚近似从氘核或³He数据提取中子信息，得到质子、氘核、中子和³He的极化光生截面，发现氘核与中子在Δ(1232)区域强度更大且更符合同位旋对称性。
AI中文摘要：
我们报告了对质子、氘核、中子和³He的极化光生截面的提取结果，该结果通过将电子散射数据外推至实光子点得到。数据来自杰斐逊实验室的E97-110（³He）实验和CLAS EG4（质子和氘核）实验；中子信息则通过弱束缚近似从氘核或³He数据中提取。与实光子获得的数据相比，质子结果吻合，而氘核和中子的结果在Δ(1232)区域呈现更大强度，且与质子结果相比更符合同位旋对称性。
英文摘要：
We report on an extraction of the polarized photoproduction cross-section for the proton, deuteron, neutron and $^3$He, obtained by extrapolating electron scattering data to the real photon point. The data are from the Jefferson Lab E97-110 ($^3$He) and CLAS EG4 (proton and deuteron) experiments. Information on the neutron is extracted from the deuteron or $^3$He data using the weak binding approximation. Comparing with data obtained with real photons, we find that while the proton results agree, our results on the deuteron and the neutron exhibit a larger strength in the $Δ(1232)$ region, and are more consistent with isospin symmetry when compared with the proton results.
