ESTIMATION OF DELAYED NEUTRON EMISSION PROBABILITY AND DELAYED NEUTRON YIELDScience and Engineering Research Laboratory, Waseda University 3-4-1 Okubo, Shinjuku-ku, Tokyo 160, Japan S. Matsuda and R. Nakasima Department of Physics, Hosei University Fjimi, Chiyoda-ku, Tokyo 102, Japan Delayed neutron emission probabilities have been calculated for fission product nuclei with use of the improved gross theory, and fairly good results have been obtained. These delayed neutron emission probabilities have been combined with the fission yields in the recently-completed second version of the JNDC File to calculate the total delayed neutron yields. The total delayed neutron yields have also been calculated from experimental delayed neutron emission probabilities as well as from the delayed neutron emission probabilities obtained from the empirical formula by Kratz and Herrmann. These results for the total delayed neutron yields are compared with the recommended values by Tuttle. KEYWORDS: delayed neutron, delayed neutron yield, fission product, gross theory of β-decay, empirical formula |