HINDRANCE FACTORS OF ALLOWED 1+-]0+ DECAYS IN EVEN-EVEN NUCLEI WITH A=66-80

Recent work with solid-state detectors on the logft values of allowed decays from 1+ ground states to 0+ and 2+ states in four even-even nuclei (66A80) is surveyed. Decays to the first excited 2+ and second excited 2+ states are successively hindered over transitions to the 0+ ground states. Transitions to the excited 0+ states proceed at rates that are generally hindered even more than those to the second 2+ levels in these nuclei. Relative B(E2) values from the excited 2+ states in Zn66 and Zn68 are compared. © 1969 The American Physical Society.