在地面通过空气簇射进行宇宙线研究，依赖于描写AS的强子作用模型。检验和改进现有强子作用模型，是目前高能宇宙线研究的迫切任务。强子作用模型的建立须以加速器实验数据为依据。到去年为止，加速器只提供了20-400TeV 近朝前区的数据，极端朝前区没能测量。最近LHCf给出了质心能量7TeV质子对撞（约合静止靶2.6x10^17eV）极端朝前区单举光子能谱测量，为改进强子作用模型提供了重要资料。但10^15-10^16eV能区仍是空白。由于西藏羊八井高海拔地利及我们的AS轴芯探测器YAC对观测朝前区强子作用具有独到优势，本申请拟利用已获得的羊八井芯探测器（YAC）实验数据，在10到1000TeV以上 能区，对强子作用的非弹性作用截面、朝前区Feynman scaling行为等给出独家报道。在2011年第32届国际宇宙线会议上，国际同行对YAC实验进展非常关注，我们希望尽快作出物理结果。

The studies of high-energy cosmic rays through the observation of air showers on the ground depend on the hadronic interaction models that describe ASs. Checking and improving the currently used interaction models are the urgent tasks of these studies. The construction of any hadronic interaction model relies on the experiment data provided by accelerators. Up to last summer, only data of particle produced in the near-forward region in the energy region of 20-400 TeV were available, and no measurement in the very-forward region was executed. Recently, LHCf reported their measurement on the very-forward production of inclusive photons at the CMS energy of 7 TeV (corresponding to the static system, 2.6x10^17 eV) that provided important information for the improvement of the hadronic interaction models. However, there are still no information of very-forward particle production in the energy region of 10^15 eV - 10^16 eV. Due to the unique advantage of Yangbajing high altitude and our AS core detector (YAC) in the observation of forward hadronic interactions,in this application, by using the already obtained YAC + Tibet-III data, we plan to make our studies on the inelastic interaction cross section, inelasticity, Feynman scaling behavior etc at the energy region from 10 TeV to >1000 TeV. The method and the route of this study is seen in the text. In the 32nd International Cosmic Ray Conference hold in Beijing in August 2011, the progress of YAC experiment received much attention from many cosmic-ray scientists. We want to report our physics results as soon as possible.