Lifetime measurements of excited levels in prompt fission products of 252Cf
1986; Elsevier BV; Volume: 454; Issue: 2 Linguagem: Inglês
10.1016/0375-9474(86)90265-4
ISSN1873-1554
AutoresG. Mamane, E. Cheifetz, E. Dafni, Amos Zemel, J. B. Wilhelmy,
Tópico(s)X-ray Spectroscopy and Fluorescence Analysis
ResumoLifetimes 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.
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