主 持 人:王为 教授
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[摘要]
Galactic Cosmic ray (CR) origin is still a mystery. Measuring the knees of the CR spectra for individual species with high precision is a very important approach to solve the problem. ARGO-YBJ and LHAASO-WFCTA combined experiment made the first step by measuring the spectrum of hydrogen plus helium nuclei and finding the knee around 0.7 PeV. The combination of one of the water Cherenkov detector and 6 wide FoV Cherenkov telescopes is an enhanced apparatus for this measurement. The key is to separate protons from all CR samples. A multi variate analysis (MVA) approach for the CR composition analysis in LHAASO experiment is developed for the purpose of measuring the knee of proton spectrum. The proton plus helium spectrum can be measured up to 10 PeV using the similar technique. The indication of the knee of helium spectrum is also expected. The knees of the spectra of heavy nuclei are believed to be above 10 PeV implied by the previous experiment, such as ARGO-YBJ and LHAASO-WFCTA. The whole 1 km2 array combining with 18 telescopes in LHAASO also has a suitable size for the measurement with the required precision. We have identified a couple of variables that are sensitive to the composition of showers. The efficiency and the purity of the selection for demanded species are optimized by well configuring the LHAASO array using the LHAASO simulation tools. Preliminary results of the analysis and expectations are presented. The LHAASO construction status is updated in the presentation, too.
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