Dear Bill, you're right, it was in 1934-1935 and not in 1936, you can review the following items:
Amaldi, E., d'Agostino, O., Fermi, E., Pontecorvo, B., RASETTI, F., & Segre, E. (1935). Artificial radioactivity produced by neutron bombardment. II. Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, 149 (868), 522-558.
Herszfinkiel, H., Rotblat, J., & z and w, M. (1935). Loss of Velocity of Neutrons in Heavy Water. Nature, 135, 653-654.