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Reactions Induced by Slow Neutron Irradiation of Europium
Hayden, Richard J.; Reynolds, John H.; Inghram, Mark G.
AA(Argonne National Laboratory and University of Chicago, Chicago, Illinois), AB(Argonne National Laboratory and University of Chicago, Chicago, Illinois), AC(Argonne National Laboratory and University of Chicago, Chicago, Illinois)
Physical Review, vol. 75, Issue 10, pp. 1500-1507
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A sample of europium which had been subjected to slow neutron irradiation was analyzed using mass spectrometric techniques. By using a modified isotopic dilution technique, i.e., adding a standard containing known relative abundances of normal samarium, europium, and gadolinium the complete chemical and isotopic analysis of the irradiated sample was obtained. Combining this nuclide composition and certain radioactivity measurements the thermal neutron cross sections, half-lives and branching ratios of five of the europium isotopes were calculated. The results were sigma151=5200 barns, sigma152=3200 barns, sigma153=240 barns, sigma154=880 barns, sigma155=7900 barns, T12(152)=5.3 years, T12(154)=5.4 years, T12(155)=1.7 years, Kbeta- ratio for 9.2-hr. Eu152=0.22, Kbeta- ratio for 5.3-year Eu152=2.8, and Kbeta- ratio for 5.4-year Eu154<0.05. All these results are believed to be good to +/-15 percent.
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