S. Borzakov¹, A. Kalinin¹, I. Ruskov¹, E. Dermendjiev², S.M. Soloviev^3
1Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia
²Institute for Nuclear Research and Nuclear Energy, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
³Chlopin Radium Institute, St. Petersburg, Russia

Abstract. A study of fission γ-ray yields from ²³⁷Np low-energy resonances has been performed at the Dubna IBR-30 pulsed reactor. A multiplate fission chamber with 1.5 g of high purity ²³⁷Np for detection of fission events, and a large 6-section liquid scintillation detector for detection of 3 or more γ-quanta in coincidence with fission fragments were used for fission γ-ray yield measure? ments. A "1/Γ_f" dependence was found for the γ-ray yields in ²³⁷Np resonances. This experimental result can be interpreted as an indication of a prefission γ-ray emission, i. e. of the existence of the (n, γf) process.

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