Study of the antiνsub(μ)p interactions with a liquid hydrogen sensitive target surrounded with a Ne-H2 mixture

A study is made of the interactions of muonic neutrinos and antineutrinos with the proton of a BEBC bubble chamber fitted with a liquid hydrogen target surrounded with a H2-neon mixture and completed by an external detector of muons. The following interactions are concerned: νsub(μ) p → μ-(p or n) + k1 π+- + k2 π0 and antiνsub(μ) p → μ+ (p or n) + k'1 π+- + k'2 π0. One must be able to reconstruct correctly the π0 and to select those events comprising a proton or a neutron in the final state. Two methods were employed for determining the energy of the gamma resulting from the decay of the π0. An original method was developed to isolate the reactions with protons from those with neutrons. The initial comparative results of the fragmentation into π+- and π0 are given