Abstract
A new technique is described for the rapid separation of antimony and arsenic isotopes from fission products, based on the formation of antimony and arsenic hydrides in a nuclear reactor. The major peaks in the gamma spectra of 128Sb (9 min), 129Sb (4·5 hr) and 130Sb (39 min) are reported and compared with other recent measurements. Delayed neutron emission has been observed for the first time from antimony and arsenic isotopes. The experimental evidence indicates that there are three delayed neutron precursors; two of these have half-lives of 2 sec and are tentatively assigned to 135Sb and onethe isotopes 85–87As; the third, and as yet unassigned, precursor has a half-life of 14 ± 4 sec. The existence of a 6 sec delayed neutron precursor, which is a daughter product of one of the rare gases, has been confirmed.
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