Abstract
Photofission cross sections of209Bi,238U and232Th are very different, both in magnitude and in their dependence on the incident photon energy. In fact, in the quasi-deuteron energy region,σ f (Bi)<10−2 σ f (U), withσ f (Th) having intermediate values. Alsoσ f (Bi) increases monotonically vs.E γ whileσ f (U) andσ f (Th) (above 75 MeV) are approximatively constant. We propose here a parametrization of photofission in the quasi-deuteron region, which fits, up toE γ ⋃m π , the photofission cross sections of these three nuclei.
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We are indebited to Prof. Ulrich Kneissl for having called our attention to the Th nucleus and for many suggestions and criticisms, Prof. Carlo Schaerf for useful discussions on the experiments, Prof. Alberto Devoto and Dr. Marcello Lissia for critically reading the manuscript.
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Delsanto, P.P., Fubini, A., Murgia, F. et al. Photofission of209Bi,232Th and238U in the quasi-deuteron energy region. Z. Physik A - Hadrons and Nuclei 342, 291–298 (1992). https://doi.org/10.1007/BF01291512
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DOI: https://doi.org/10.1007/BF01291512