SPring-8, the large synchrotron radiation facility

This talk will be given in Japanese

Date & Time: 13:30 - 14:30, February 9, 2006

Speaker: Dr. Yasuhiro Iwamura
Affiliation: MITSUBISHI HEAVY INDUSTRIES, LTD.

Abstract
　　Low energy nuclear transmutations in condensed matter have been observed in the Pd complexes, which are composed of Pd and CaO thin film and Pd substrate, induced by D2 gas permeation through Pd multilayer complexes. Permeation of deuterium is attained by exposing one side of the Pd complex to D2 gas while maintaining the other side under vacuum conditions. The Pd complex consists of Pd bulk (25mmX25mmX0.1mm), Pd and CaO complex layer(100nm) and Pd thin film(40nm). The permeation time is about 7-14 days. We also observed transmutation reactions of Ba into Sm and Sr into Mo, respectively. Experimental results on depth profile of Pr so far suggest that the reactions seem to occur in the very thin surface region within 10 nanometer.
　　"In-situ" measurement of transmutation of Cs into Pr and surface distribution of Pr were performed using X-ray Fluorescence Spectrometry at SPring-8. The "in-situ" measurement indicated that Pr emerged and Cs decreased at some points after D2 gas permeation, though any Pr cannot be observed before D2 gas permeation at all the points on the Pd complex surface. Using small size X-ray beam in 100- and 500-micrometer squares, we took 2 dimensional XRF spectra. Three samples that were already permeated were used. We detected Pr by the two kinds of X-ray beams as expected. The amount of Pr changed greatly depending on the locations of the Pd surface. We are now investigating about the correlation between surface structures and distribution of Pr.