The Disintegration ofCs130

The Spontaneous Fission of Uranium-238

“…4 shows the y-spectrum of a cerium sample. As is clearly seen in the figure, each photopeak agrees with a well-known y-ray of either ^^Ce or [4,5]. The decay curve for the 0.295 MeV photopeak showed a half-life of 33.4 hrs.…”

“…3, the decay curve obtained from the yttrium sample was analysed and each component was assigned to the respective nuclide, '^Y, '"Y and ®Y [4]. The contamination from y-emitters such as ^'^Th is considered to be negligible, since the only gamma activity detected in the yttrium sample were some small photopeaks attributable to [5]. Yttrium samples for 47t-counting gave the typical decay curves of two components, ^^Y and ''Y.…”

“…The half Hfe of caesium 130 has been reported as 30 + 1 m [2,5]. Both of these isotopes are of interest in medical research, and have recently been in routine production in our laboratories.…”

High-accuracy mass determination of unstable cesium and barium isotopes

“…If our value for 130 Cs is used, several (not severe) inconsistencies in this region vanish. The Q-value of [28] was in con ict with all measurements determining the mass value of 130 Cs, even with the Q + -value of 130 Cs determined in the same publication. The reason for the strong disagreement w as the estimated error of the Q -value [28] of only 4 keV.…”

“…This error was assumed since no errors were given in the publication. However, in [28] not a pure -spectrum was recorded but the sum of the + -and -decays. The Q-value for the -branch was obtained from the di erence between the sum spectrum and the highly energetic + -component.…”