New evaluated data on $$^{{{206,207,208}}}$$ Pb photodisintegration
Tóm tắt
New cross sections of the partial (
$$\gamma ,1n)$$
, (
$$\gamma ,2n)$$
, and (
$$\gamma $$
, 3n) and total (
$$\gamma $$
, Sn), and (
$$\gamma $$
, tot) photoneutron reactions for
$$^{{206,207}}$$
Pb were evaluated using the experimental-theoretical method. The evaluation procedure was based on the comparison in detail of
$$^{{206,207}}$$
Pb data obtained only at Livermore (USA) with
$$^{{208}}$$
Pb data obtained at Livermore, Saclay (France) and also in other experiments. It was found that in the cases of all
$$^{{206,207,208}}$$
Pb isotopes clear disagreements between Livermore data and new evaluated data can be explained by the assumption of loss of many neutrons in experimental (
$$\gamma $$
, 1n) reaction cross sections. It was shown that Livermore experimental data for
$$^{{206,207,208}}$$
Pb as well as for
$$^{{75}}$$
As,
$$^{{127}}$$
I, and
$$^{{181}}$$
Ta investigated before are not reliable.
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