Multi-layered parallel plate ionization chamber for cross-section measurements of minor actinides

A multi-layered parallel plate ionization chamber (MLPPIC) has been developed for the measurement of neutron-induced fission cross-sections using the lead slowing-down neutron spectrometer at the Research Reactor Institute, Kyoto University. The MLPPIC consists of two sets of multi-layered electrodes to detect fission fragments from two samples located back-to-back between them. The performance of the MLPPIC was tested with a spontaneous fission of 248Cm. The cross-section for the neutron-induced fission of 241Am was successfully obtained using that of 235U as a reference.