Publication Details:
Journal or Publication Title:
Armenian Journal of Physics=Ֆիզիկայի հայկական հանդես
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Title:
SEARCHING FOR LONG-LIVING RARE PRODUCTS OF THE 252Cf SPONTANEOUS FISSION
Creator:
Aleksanyan, A. ; S. Amirkhanyan ; H. Gulkanyan ; T. Kotanjyan ; L. Poghosyan ; V. Pogosov
Corporate Creators:
A. I. Alikhanyan National Scientific Laboratory, Yerevan, Armenia
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Abstract:
The long-living products of the 252Cf spontaneous fission are searched for with the help of a Ge(Li) detector irradiated by a 25.5 year old source in the low-background laboratory in the Avan salt mine (Yerevan). No significant photopeaks from the decays of 125Sb, 134Cs, 146Pm, 150Eu, 152Eu and 158Tb are observed in the detector response function analyzed in the energy range of 400÷1400 keV. The upper limits of their cumulative yields are estimated. Strong photopeaks are observed for two longliving isotopes, 137Cs and 154Eu . The content of the 137Cs photopeak corresponds to its cumulative yield of (5.07±0.35)·10-2, in agreement with the available data, while the contents of the 154Eu photopeaks correspond, on an average, to the yield of (1.84±0.17)·10-2, which is much larger than expected from the model predictions. The upper limits for the rates of the sodium (22Na) and cobalt (60Co) radioactivity of the 252Cf nucleus relative to the rate of the α-decay are estimated to be 1.6·10-5 and 3.5·10-7, respectively.