Ratios of Independent Yields of the Isomers Te131−131m and Te133−133m in Fission

Abstract

The independent yield ratios of $\frac{(30\mathrm{}-\mathrm{h} {\mathrm{Te}}^{131m})}{(25\mathrm{}-\mathrm{m}\mathrm{i}\mathrm{n} {\mathrm{Te}}^{131})}$ and of $\frac{(53\mathrm{}-\mathrm{m}\mathrm{i}\mathrm{n} {\mathrm{Te}}^{133m})}{(12.5\mathrm{}-\mathrm{m}\mathrm{i}\mathrm{n} {\mathrm{Te}}^{133})}$ were measured in the following types of fission: ${\mathrm{U}}^{235}$ with thermal neutrons, and ${\mathrm{Th}}^{232}$ and ${\mathrm{U}}^{238}$ with 18-MeV deuterons and with 33-MeV ${\mathrm{He}}^4$ ions. The fractional independent chain yields of the isomers were measured by determining the growth curves of the daughter iodine activities extracted at successive time intervals from aliquots of samples containing tellurium activities quickly separated from fission induced in short irradiations, and correcting for contributions from precursors. The isomer-yield ratios for independent formation for $\frac{30-\mathrm{h} {\mathrm{Te}}^{131m}}{25-\mathrm{m}\mathrm{i}\mathrm{n} {\mathrm{Te}}^{131}}$ and for $\frac{53-\mathrm{m}\mathrm{i}\mathrm{n} {\mathrm{Te}}^{133m}}{12.5-\mathrm{m}\mathrm{i}\mathrm{n} {\mathrm{Te}}^{133}}$, respectively, are as follows: 1.8±0.4 and 1.55±0.5 for ${\mathrm{U}}^{235}(n_{\mathrm{th}},F)$, 3.3±0.5 and 2.8±1.7 for ${\mathrm{Th}}^{232}({\alpha }_{33},F)$, 2.7±0.5 and 1.7±0.9 for ${\mathrm{Th}}^{232}(d_{18},F)$, 5.0±1.0 and 3.1±2.0 for ${\mathrm{U}}^{238}({\alpha }_{33},F)$, and 3.3±0.5 and 1.8±1.1 for ${\mathrm{U}}^{238}(d_{18},F)$. The fractional independent chain yield of ${\mathrm{Te}}^{131m}+{\mathrm{Te}}^{131}$ was measured as 0.124±0.014 for ${\mathrm{U}}^{235}(n_{\mathrm{th}},F)$. The fraction of decay of

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This publication has 21 references indexed in Scilit:

• Relative cross-sections for formation of the shielded isomeric pair 134mCs and 134Cs in medium energy fission
  Journal of Inorganic and Nuclear Chemistry, 1964
• Nuclear-Charge Distribution in Low-Energy Fission
  Physical Review B, 1962
• Fission Fragment Angular Distributions and Saddle Deformations
  Physical Review B, 1962
• Fission Fragment Anisotropy and Pairing Effects on Nuclear Structure
  Physical Review B, 1961
• SEARCH FOR CORRELATIONS OF MOST PROBABLE NUCLEAR CHARGE Z_P OF PRIMARY FISSION FRAGMENTS WITH COMPOSITION AND EXCITATION ENERGY
  Canadian Journal of Chemistry, 1961
• Nuclear Fission
  Annual Review of Nuclear Science, 1959
• Monte Carlo Calculations of Nuclear Evaporation Processes. III. Applications to Low-Energy Reactions
  Physical Review B, 1959
• 115Cd isomer yield ratios from deuteron fission of 238U and from the 118Sn(d,αp), 118Sn(n,α), 115In(d,2p), 115In(n,p) and114Cd(d,p) reactions from 10 to 25 MeV
  Journal of Inorganic and Nuclear Chemistry, 1959
• Nuclear thermodynamics of the heaviest elements—II
  Journal of Inorganic and Nuclear Chemistry, 1958
• Radiochemical Studies of the High-Energy Fission Process
  Physical Review B, 1955

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