The lifetimes of a number of rotational nuclear levels have been measured in a pulsed-beam experiment. Gamma rays were counted and timed in a cooled unactivated NaI crystal. The excited states investigated were the first-excited levels in Gd¹⁵⁸, Yb172,174,176, Hf¹⁷⁷, and W182,184,186.
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Birk et al. (1962) studied this question.
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