Study of cosmic ray spectrum and composition by using coincident events between LHAASO and ENDA

By accurate measurement of composition and energy spectrum in the knee region, the problem of origin of galactic cosmic ray can be solved. Hadrons are the “skeleton” of extensive air shower (EAS) and possess favorable information concerning the cosmic ray composition and energy. The electron-neutron detector (EN-detector) can detect both EAS electrons and thermal neutrons generated by EAS hadrons in surrounding matter. The electron-neutron detector array (ENDA) was proposed to be added into the Large High Altitude Air Shower Observatory (LHAASO) to improve its capability of EAS hybrid detection.ENDA was expanded from an initial 16 detectors to 64 detectors in April 2023, so called ENDA-64, and has been running alongside LHAASO.In this report, we will present results of hybrid detection of cosmic ray by using ENDA and LHAASO.