BOSE-EINSTEIN CORRELATIONS IN NEUTRINO AND ANTINEUTRINO INTERACTIONS WITH NUCLEONS

Four data sets of charged current neutrino and antineutrino interactio ns with neon, deuterium and hydrogen collected from BEBC and the 15 Fo ot Bubble Chamber are used to study the Bose-Einstein correlations bet ween like-sign charged pions. Two forms of the parametrization for the effect are used. No substantial differences are found between the dat a sets obtained with neon, deuterium and hydrogen targets. The Lorentz invariant parametrization of Goldhaber gives for the radius of the pi on emission region the value r(G) = 0.80 +/- 0.04 +/- 0.16 fm and for the chaoticity parameter the value lambda = 0.61 +/- 0.04 +/- 0.15. Us ing the Kopylov-Podgoretskii parametrization yields r(K) = 1.27 +/- 0. 06 +/- 0.12 fm, lambda = 0.58 +/- 0.03 +/- 0.12 and for the pion sourc e lifetime ctau = 0.52 +/- 0.05 +/- 0.12 fm. The Goldhaber parametriza tion was used to study the effect in further detail. The same emission radius and the same strength of the effect were found for particles p roduced in interactions on neutrons and protons. The data are compatib le with a spherical shape of the pion emission region. No multiplicity or forward-backward dependences are found. No dependence of the effec t on the event kinematical variables is seen.