论文标题
带有核目标的Gerasimov-Drell-Hears-sum-rule
The Gerasimov-Drell-Hearn sum-rule with nuclear targets
论文作者
论文摘要
当将强子嵌入核培养基中时，强子特性会改变。在这里，我们讨论了Gerasimov-Drell-Hearn，GDH，从极化核靶中的极化核子产生极化光生物的总和规则。预计会通过抑制质子和核子共振质量并在培养基中增强质子的异常磁矩。这可以在两极分化的光增生实验中进行测试，有趣的目标是极化的杜特龙，$^3 $ HE，$^6 $ li和$^7 $ li。对GDH总规则的最大贡献来自$δ$共振激发。与模型预测相比，在具有偏光杜特隆的现有数据和$δ$兴奋的情况下，$δ$的激发量转移到略低的能量，而$δ$用自由质量处理。
Hadron properties are modified when the hadron is embedded in a nuclear medium. Here we discuss the Gerasimov-Drell-Hearn, GDH, sum rule for polarised photoproduction from a polarised nucleon within a polarised nuclear target. Strong enhancement is expected with the suppression of the proton and nucleon resonance masses and enhancement of the proton's anomalous magnetic moment in medium. This could be tested in polarised photoproduction experiments with interesting targets being polarised deuterons, $^3$He, $^6$Li and $^7$Li. The largest contribution to the GDH sum rule comes from the $Δ$ resonance excitation. In existing data with polarised deuterons and $^3$He the $Δ$ excitation is shifted to slightly lower energy when compared to model predictions where the $Δ$ is treated with its free mass.
