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On-Line gamma--Gamma Angular Correlation Studies of Cascades in exp 140 BA, exp 90 Sr, and exp 140 CS.

IST673

Publication Date	1975
Personal Author	Alquist, L. J.
Page Count	148
Abstract	Angular correlation measurements were made on gamma-ray cascades in exp 140 Ba, exp 90 Sr, and exp 140 Cs. These fission-product activities were isobarically enhanced from Kr and Xe noble-gas parents, which were mass-separated by the TRISTAN isotope separator system. Levels in exp 140 Ba were populated from the 64-sec decay of exp 140 Cs, and in exp 140 Cs from the 14-sec decay of exp 140 Xe. Levels in exp 90 Sr were populated from the 2.7-min decay of exp 90 Rb, which was populated from the decay of exp 90 Kr. The most intense transitions were measured in coincidence with the first excited state to ground state transition in even-even exp 140 Ba and exp 90 Sr. The two-parameter mode of data accumulation was used to study cascades with transitions in coincidence with the 806-keV and 989-keV transitions in odd-odd exp 140 Cs. In the study of cascades in exp 140 Ba definite spin assignments were made for eight levels, and tentative spin assignments for five levels. For exp 90 Sr definite spin assignments were made for eight levels, and tentative assignments for six levels. A definite 1- spin-parity assignment was made for the 103-keV level in exp 140 Cs, and tentative assignments were made for five other levels. Values are given for the angular correlation coefficients, and limits of multipolarity mixing ratios are given where applicable. (44 figures, 3 tables).
Keywords	Barium 140 Energy-level transitions Strontium 90 Cesium 140 Fission yield Uranium 235 Angular correlation Mixing ratio Multipolarity Spin Beta-minus decay Krypton 90 Rubidium 90 Xenon 140
Source Agency	US Energy Research and Development Administration
NTIS Subject Category	46 - Physics
Corporate Authors	AMES Lab., Iowa.
Document Type	Technical Report
NTIS Issue Number	197525
Contract Number	W-7405-ENG-82

On-Line gamma--Gamma Angular Correlation Studies of Cascades in exp 140 BA, exp 90 Sr, and exp 140 CS.

On-Line gamma--Gamma Angular Correlation Studies of Cascades in exp 140 BA, exp 90 Sr, and exp 140 CS.
IST673

Publication Date	1975
Personal Author	Alquist, L. J.
Page Count	148
Abstract	Angular correlation measurements were made on gamma-ray cascades in exp 140 Ba, exp 90 Sr, and exp 140 Cs. These fission-product activities were isobarically enhanced from Kr and Xe noble-gas parents, which were mass-separated by the TRISTAN isotope separator system. Levels in exp 140 Ba were populated from the 64-sec decay of exp 140 Cs, and in exp 140 Cs from the 14-sec decay of exp 140 Xe. Levels in exp 90 Sr were populated from the 2.7-min decay of exp 90 Rb, which was populated from the decay of exp 90 Kr. The most intense transitions were measured in coincidence with the first excited state to ground state transition in even-even exp 140 Ba and exp 90 Sr. The two-parameter mode of data accumulation was used to study cascades with transitions in coincidence with the 806-keV and 989-keV transitions in odd-odd exp 140 Cs. In the study of cascades in exp 140 Ba definite spin assignments were made for eight levels, and tentative spin assignments for five levels. For exp 90 Sr definite spin assignments were made for eight levels, and tentative assignments for six levels. A definite 1- spin-parity assignment was made for the 103-keV level in exp 140 Cs, and tentative assignments were made for five other levels. Values are given for the angular correlation coefficients, and limits of multipolarity mixing ratios are given where applicable. (44 figures, 3 tables).
Keywords	Barium 140 Energy-level transitions Strontium 90 Cesium 140 Fission yield Uranium 235 Angular correlation Mixing ratio Multipolarity Spin Beta-minus decay Krypton 90 Rubidium 90 Xenon 140
Source Agency	US Energy Research and Development Administration
NTIS Subject Category	46 - Physics
Corporate Authors	AMES Lab., Iowa.
Document Type	Technical Report
NTIS Issue Number	197525
Contract Number	W-7405-ENG-82