Determination of the Relative Electron Density at the Be Nucleus in Different Chemical Combinations, Measured as Changes in the Electron-Capture Half-Life ofBe7

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Abstract
Differences in the decay constant of Be7 in various states of chemical combination were measured using the differential-ionization-chamber technique. The results are: {λ(BeO)−λ(BeF2)amorph=(1.130±0.058)×10−3λ(Be),}{λ(BeO)−λ(Be4O(CH3COO)6)=(−0.724±0.057)×10−3λ(Be),}{λ(BeO)−λ(BeBr2)=(1.472±0.063)×10−3λ(Be),}{λ(Be4O(CH3COO)6)−λ(BeF2)amorph=(1.852±0.082)×10−3λ(Be),}{λ(BeO)−λ(Be(C5H5)2)=(0.795±0.074)×10−3λ(Be),}{λ(BeO)−λ(Be2+(OH2)4)=(−0.374±0.077)×10−3λ(Be),}{λ(Be(C5H5)2−λ(Be2+(OH2)4)=(−1.169±0.106)×10−3λ(Be).} The decay constant of Be7 is proportional to the electron density at the nucleus. These results can therefore be used to establish a scale for the relative electron density at the Be nucleus in different chemical combinations.