Radiochemical determination of the absolute yields of fragments of the fission of Pu241 and Pu239 by slow neutrons

Сорокина, А. В.; Skovorodkin, N.V.; Bugorkov, S. S.; Krivokhatskii, A.S.; Petrzhak, K.A.

doi:10.1007/bf01153787

Cited by 6 publications

(4 citation statements)

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“…λ is the decay constant of "Mo or 131 1, Ν is the number of atoms of 239 Pu or 23S U, Of^ is the fission crosssection and Y is the fission yield of "Mo or 131 1 in the thermal neutron fission of 239 Pu or 235 U. Table 1 summarizes the different published fission yield values [2][3][4][5][6][7]9,11,[13][14][15][16][17][18][19][22][23][24][25][26][27][28] for "Mo in the thermal neutron fission of 239 Pu. It is seen that the latest three values [15][16][17] reported by different laboratories are in good agreement with one another and lead to an average value of 6.22% while a value of 6.80% was reported from this laboratory in 1970's [9,11 ].…”

Section: Calculationsmentioning

confidence: 99%

“…D. thesis [12], Subsequently, LAMMER andEDER published [13] a discussion of fission product yield evaluation methods and emphasized that 2200m/sec fission cross-section values for 239 Pu and 235 Uused in the above work should take into account the neutron temperature Qf+rs) correction. Since then, four more experimental determinations for the fission yield of 99 Mo in 239 Pu have been published [14][15][16][17] and the values are (6.17±0.19)%,(6.22+0.14)%, (6.23 ±0.09)% and (6.23±0.16)%. A recalculation of the fission yield data of 239 Pu incorporating the (£+rs) correction for the neutron temperature leads to resolving the difference between the earlier published high values for 99 Mo fission yield in 239 Pu and other recently reported values.…”

Section: Introductionmentioning

confidence: 99%

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Fission Yields in the Thermal Neutron Fission of Plutonium-239

Jain

Ramaniah

1984

Radiochimica Acta

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Fission yields for 27 mass numbers were determined in the thermal neutron fission of 23 'Pu using high resolution gamma ray spectrometry and radiochemical method together with data reported earlier. In the radiochemical method, the total number of fissions were calculated without considering the neutron temperature correction to the Pu fission cross-section. This paper presents the results taking into account the effect of neutron temperature on the fission cross-section and gives a comparison of the resulting fission yield values with the latest experimentally determined values and those given in two recent compilations.

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Section: Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fission Yields in the Thermal Neutron Fission of Plutonium-239

Jain

Ramaniah

1984

Radiochimica Acta

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“…Several investigators have measured the fission" yield of 9 9 Mo in the thermal neutron fission of 239 Pu [1][2][3][4][5][6]. However, the values reported vary over a wide range, the different values being 5.61, 6.02,6.10, 6.17, 6.44 and 6.59%.…”

Section: Introductionmentioning

confidence: 96%

Decay of 2.1-min and 4.1-min ₁₃₂Sb Isomers and 2.3-min ¹³³Sb

Erten

Blachot²

1973

Radiochimica Acta

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In an investigation of γ-ray spectra of Sb isotopes rapidly isolated from 235 U fission products, evidence was obtained for the existence of 2.1 and 4.1 min isomers of 132 Sb and for a 133 Sb half-life of 2.3 ± 0.3 min. Intense 7-rays with energies of 103.2, 697.4, and 974.6 keV were found to exhibit complex decay curves that could be resolved into 2.1 ± 0.3 and 4.1 ± 0.4 min components and were assigned to the decay of 132 Sb isomers. Other equally intense 7-rays at 1096.4, 1728.2, and 2751.7 keV showed half lives of 2.3 ± 0.2 min and, as they were found to have no coincidence relationships with the above three 7-rays, were assigned to 133 Sb decay. Observation of γ-γ coincidences permitted the assignment of the 989.3 keV 7-ray to the decay of 2.1 min 132 Sb, the 151.1 and 383.2 keV 7-rays to the decay of 4.

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“…Whereas general agreement has been reached for its yield in the thermal neutron fission of 23B U [1][2][3][4][5][6][7], there exist still large discrepancies between different measurements for 233 U and especially for 239 Pu [8][9][10][11][12][13][14][15]. The variations in the experimental values are of course reflected in the evaluations of fission yields which recommend different "best" values [1][2][3][4][5][6].…”

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confidence: 99%