Abstract
The integral measurement of the neutron inelastic cross section leading to the 26-minute half-life $^{235m}\mathrm{U}$ isomer in a fission-like neutron spectrum is presented. The experiment has been performed at a pulsed reactor, where the internal conversion decay of the isomer was measured using a dedicated electron detector after activation. The sample preparation, efficiency measurement, irradiation, radiochemistry purification, and isomer decay measurement will be presented. We determined the integral cross section for the $^{235}\mathrm{U}(n,{n}^{\ensuremath{'}})^{235m}\mathrm{U}$ reaction to be $1.00\ifmmode\pm\else\textpm\fi{}0.13\phantom{\rule{0.28em}{0ex}}\mathrm{b}$. This result supports an evaluation performed with talys-1.4 code with respect to the isomer excitation as well as the total neutron inelastic scattering cross section.
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