Short-lived bromine and selenium nuclides from fission,☆☆

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Abstract

A 6·0 ± 0·2 min bromine activity has been found in fission products and in rubidium bombarded with D-T neutrons. Experiments with enriched 85Rb and 87Rb support its assignment as an isomer of 84Br. β- and γ-scintillation counting with 100-channel pulse analysis indicate β groups of 0·8 ± 0·1 MeV (20 per cent), 1·9 ± 0·2 MeV (72 per cent), and possibly 3·2 MeV (∼8 per cent), plus prominent γ rays of 0·44 ± 0·01 MeV (68 per cent), 0·88 ± 0·01 MeV (75 per cent), 1·46 ± 0·02 MeV (75 per cent), and 1·89 ± 0·03 MeV (16 per cent). The 235U thermal fission yields of the 6·0 min 84Br and the 31·7 min 84Br are (0·019 ± 0·003) per cent and (0·92 ± 0·06) per cent, respectively. By rapid separation of selenium from fission products and subsequent milking of the bromine daughters the half-lives of 84Se and 85Se have been measured as 3·3 ± 0·2 min and 39 ± 4 sec, respectively. The 6·0 min 84Br does not appear to grow from selenium. The experiments also produced evidence for a 16 ± 3 sec selenium parent of a 1·0 min bromine activity which is probably 87Br.

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    Citation Excerpt :

    The intensities of the lines are in the order indicated by the letters, and agree well enough with the chemical atomic weight 79.2.” In the 1960 paper “Short-lived Bromine and Selenium Nuclides From Fission” Sattizahn et al. reported the discovery of 84Se and 85Se [76]. The isotopes were produced by irradiation of 93% 235U in the Los Alamos Water Boiler.

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Work performed under the auspices of the U.S. Atomic Energy Commission.

☆☆

This paper is a portion of the dissertation presented to the University of New Mexico by J. E. Sattizahn in partial fulfilment of the requirements for the degree of Doctor of Philosophy, June, 1957.

University of New Mexico.

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