THE NEGATIVE-POSITIVE RATIO OF CHARGED COSMIC RAY HADRONS AT THE 3220 m ABOVE SEA-LEVEL

Abstract：

Single tracks of unaccompanÏed charged hadrons, within a horigontal area of 0.23m ²have been measured with a magnetic spectrometer, a pre-selector of momentum in combination with a multiplate cloud chamber in a laboratory at 3220m above sea level. Taking various possible corrections into account, the negative-positive ratio of charged hadrons was obtained as N ^-/ N ⁺=0.53±0.05 in the momentum range of 10-20 GeV/c. If we considered N ⁺contained only P and π ⁺, N ^-were π ^-and that N_π+/ N_π-=1, we deduced the result N_π-/ N _p=0.9±0.1. Taking the form of the π ^-integral spectrum as j（> p）= Kp ^-γ, it was estimated that γ（?）2.3 in the momentum range 5—20 GeV/c. In this paper the integral verticel flux intensity of all charged hadrons was also estimated roughly, the result is: j _⊥ ^p+π（>12 GeV/c）=（7.4±0.7）×10 ^-5/cm ²·s г·s _^.