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Alpha-particle energies have been corrected, where necessary, to a common set of calibration energies. Standard a-particle energies have been taken mostly from A. H. lI'apstra, Nucl.Phys. 57, 48 (1964) or from the Nuclear Data Sheets. Changes in the data caused by use of the new standard energies are explicitly noted on the Sheets. Older, less precise ionization chamber measurements have not been revised although they are probably systematically low by about 0.1%.
The quantity 60 ,which can be determined more accurately than absolute values of E , is listed when reported by an experimenter.
"u I "
a.Decay Hindrance Factors The a-hindrance factor (the ratio of the measured partial half-life for a-emission to the theoretical half-life) was calculated for each transition using the technique developed by H. Michel and K. Poggenburg. The spin-independent equations of M. A. Preston [Phys. Rev. 71, 865 (1947)] were used to calculate theoretical half-lives for a-emission. The nuclear radius for each even-even nucleus was determined by assuming that the g.s. to g.s. a-transition is not hindered, i.e., the hindrance factor is one. For odd-A and odd-odd nuclei, the radius was chosen by interpolation or extrapolation from the radii of the adjacent even-even nuclei.
All adopted Q-values and separation energies shown in this issue were taken from 701l'aGo, a preliminary version of a new mass adjustment in preparation by A. H. lI'apstra and N. B. Gove.
π SIMILAR VOLUMES