M. Ambrosio et al., VERTICAL MUON INTENSITY MEASURED WITH MACRO AT THE GRAN SASSO LABORATORY, Physical review. D. Particles and fields, 52(7), 1995, pp. 3793-3802
The vertical underground muon intensity has been measured in the slant
depth range 3200-7000 hg cm(-2) (standard rock) with the completed lo
wer part of the MACRO detector at the Gran Sasso laboratory, using a l
arge sample of data. These observations are used to compute the surfac
e muon flux and the primary ''all-nucleon'' spectrum. An analysis of s
ystematic uncertainties introduced by the interaction models in the at
mosphere and the underground propagation of muons is presented.