Investigation of beta nu angular correlation in the beta+ decay of Ne-18 and O-14

(eng) The β–ν angular correlation in the β+ decay of 18Ne and 14O has been investigated using a new experimental technique. The technique is based on the precise measurement of the energy Doppler shift of a γ-quantum following the β± decay. The measurement with the 18Ne isotope gives the β–ν angular correlation coefficient α = +1.06 ±0.19 which corresponds to a constraint on the scalar interaction of √{|C_S|2+|C'_S|2} ≤ 0.29|C V|. An inter-atomic interaction between the 14O daughter atom (14N) and a CO complex has been studied in a measurement with the 14O isotope