Lifetime measurements of excited levels in prompt fission products of 252Cf

G. Mamane, E. Cheifetz, E. Dafni, A. Zemel, J. B. Wilhelmy

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Lifetimes in the range 10-11 to 10-9 s of prompt γ rays emitted from the fission fragments of 252Cf were measured using a recoil distance method. A 252Cf source was deposited on a stretched Ni foil and placed in a plunger device, the recoil direction of the studied fragments being determined by the detection of the complementary fragment. The lifetime was determined by the change in the non-Doppler-shifted peak intensities of prompt γ rays as a function of the source-plunger distance. The 2+ → 0+ half-life in 112Pd and 4+ → 0+ halflives in 104, 106Mo, 108,110Ru and 142Ba were determined for the first time. Several other measurements of longer lived 2+ → 0+ transitions were repeated as well. The experimental results are discussed within the framework of the rotational and the IBA-2 models.

Original languageEnglish
Pages (from-to)213-225
Number of pages13
JournalNuclear Physics A
Issue number2
StatePublished - 16 Jun 1986
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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