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By the thermal diffusion method, using 12 meters of hot-wire columns, concentrations of the xenon isotopes in good quantity (about 57% Xe^129 in the light fraction and 27% Xe^136 in the heavy one) have been produced without recycling. A fair-sized sample of "light" krypton, analyzing better than 50% Kr^80, was available from earlier thermal diffusion separation with recycling by Blais and Watson. These samples together with the normal gases were concentrated to thicknesses of about 3. 3 g/cm^2 in special gas target holders for use with the Brookhaven fast chopper. For krypton, neutron widths and isotopic identifications have been determined for the following levels: 27. 9 ev in Kr^83, 39. 8 ev in Kr^82, 106 ev in Kr^80, 233 ev in Kr^83, 519 ev in Kr^84, 580 ev in Kr^84, and 640 ev in either Kr^78 or Kr^80. Total widths and radiation widths have been obtained for the 27. 9- and 106-ev levels by thick-thin area analysis. For xenon, new resonances are observed at 5. 2 ev in Xe^124, 9. 5 ev in Xe^129, 14. 1, 46. 0, and 76. 0 ev all in Xe^131, 92. 0 ev in Xe^129, and 126 ev to be assigned to either the 128, 129, or 130 isotope.
Mann et al. (Tue,) studied this question.