N. Grigoryan

Kaon, pion, and proton associated photofission of Bi nuclei

The first measurement of proton, pion, and kaon associated fission of Bi nuclei has been performed in a photon energy range 1. 45 < Eγ < 1. 55 GeV. The fission probabilities are compared with an inclusive fission probabilities obtained with photons, protons and pions. The fission probability of Bi nuclei in coincidence with kaons is 0. 18 ± 0. 06 which is ∼3 times larger than the proton and pion associated fission probabilities and ∼2 times larger than inclusive ones. The kaon associated excess fission events are explained in terms of bound Λ residual states and their weak nonmesonic decays.

THE A-DEPENDENCE OF K 0 AND Λ NEUTRINOPRODUCTION ON NUCLEI

AbstractThe A dependence of the production of K0 and Λ is investigated for the first time in neutrino-nuclear reactions using the data obtained with the SKAT bubble chamber. An exponential parametrization (∼Aβ) of the particle yields results in

The yields of light meson resonances in neutrino-nucleus interactions at 〈 E ν 〉≈ 10 GeV

\beta _{V^0 }

Charged ρ-meson production in neutrino-induced reactions at ≈ 10 GeV

= 0.20 ± 0.05 for V0 particles (K0 and Λ), while for π− mesons the A dependence is much weaker (

A study of the neutrino production of φ and D s + mesons

\beta _{\pi ^ - }

The total yields of K*(892){sup +}, {sigma}{sup +}(1385), and {sigma}{sup 0} in neutrino-induced reactions at {approx} 10 GeV

= 0.068 ± 0.007). A nuclear enhancement of the ratio K0/π− is found; this ratio increases from 0.055 ± 0.013 for vN interactions up to 0.070 ± 0.011 at A ≈ 21 and 0.099 ± 0.011 at A ≈ 45. It is observed that the multiplicity rise of V0 occurs predominantly in the backward hemisphere of the hadronic system. It is shown that the A dependence of the Λ0 and π− yields can be reproduced in the framework of a model incorporating the secondary intranuclear interactions of pions originating from the primary vN interactions.