[2J10-14] Experiment & Analysis

[2J11] γ ray count rates from ²³⁸U(n,γ) and fission reactions depending on system average ²³⁵U enrichment

Yasushi Nauchi¹, Shunsuke Sato¹, *Motomu Suzuki¹, Tadafumi Sano², Hironobu Unesaki² (1. CRIEPI, 2. KURNS)

Keywords:238U(n,γ), fission prompt γ ray, Neutron induced γ ray spectroscopy, 235U enrichment, Am-Be

Two subcritical assemblies are mocked up in KUCA of which enrichment of them are 3.1 and 5.4 wt%. They were driven by an Am-Be neutron source and gamma ray spectra from the assembly were measured. The count rate ratio of gamma rays from 238U(n,γ) to fission is well correlated to the number ratio of ²³⁸U to ²³⁵U.