dorsal/arxiv
View SchemaEvaluation of the total photoabsorption cross sections for actinides from photofission data and model calculations
| Authors | I. A. Pshenichnov, B. L. Berman, W. J. Briscoe, C. Cetina, G. Feldman, P. Heimberg, A. S. Iljinov, I. I. Strakovsky |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0303070 |
| URL | https://arxiv.org/abs/nucl-th/0303070 |
| DOI | 10.1140/epja/i2004-10130-9 |
| Journal | Eur.Phys.J.A24:69-84,2005 |
Abstract
We have calculated the fission probabilities for 237-Np, 233,235,238-U, 232-Th, and nat-Pb following the absorption of photons with energies from 68 MeV to 3.77 GeV using the RELDIS Monte-Carlo code. This code implements the cascade-evaporation-fission model of intermediate-energy photonuclear reactions. It includes multiparticle production in photoreactions on intranuclear nucleons, pre-equilibrium emission, and the statistical decay of excited residual nuclei via competition of evaporation, fission, and multifragmentation processes. The calculations show that in the GeV energy region the fission process is not solely responsible for the entire total photoabsorption cross section, even for the actinides: ~55-70% for 232-Th, \~70-80% for 238-U, and ~80-95% for 233-U, 235-U, and 237-Np. This is because certain residual nuclei that are created by deep photospallation at GeV photon energies have relatively low fission probabilities. Using the recent experimental data on photofission cross sections for 237-Np and 233,235,238-U from the Saskatchewan and Jefferson Laboratories and our calculated fission probabilities, we infer the total photoabsorption cross sections for these four nuclei. The resulting cross sections per nucleon agree in shape and in magnitude with each other. However, disagreement in magnitude with total-photoabsorption cross-section data from previous measurements for nuclei from C to Pb calls into question the concept of a ``Universal Curve'' for the photoabsorption cross section per nucleon for all nuclei.
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"abstract": "We have calculated the fission probabilities for 237-Np, 233,235,238-U,\n232-Th, and nat-Pb following the absorption of photons with energies from 68\nMeV to 3.77 GeV using the RELDIS Monte-Carlo code. This code implements the\ncascade-evaporation-fission model of intermediate-energy photonuclear\nreactions. It includes multiparticle production in photoreactions on\nintranuclear nucleons, pre-equilibrium emission, and the statistical decay of\nexcited residual nuclei via competition of evaporation, fission, and\nmultifragmentation processes. The calculations show that in the GeV energy\nregion the fission process is not solely responsible for the entire total\nphotoabsorption cross section, even for the actinides: ~55-70% for 232-Th,\n\\~70-80% for 238-U, and ~80-95% for 233-U, 235-U, and 237-Np. This is because\ncertain residual nuclei that are created by deep photospallation at GeV photon\nenergies have relatively low fission probabilities. Using the recent\nexperimental data on photofission cross sections for 237-Np and 233,235,238-U\nfrom the Saskatchewan and Jefferson Laboratories and our calculated fission\nprobabilities, we infer the total photoabsorption cross sections for these four\nnuclei. The resulting cross sections per nucleon agree in shape and in\nmagnitude with each other. However, disagreement in magnitude with\ntotal-photoabsorption cross-section data from previous measurements for nuclei\nfrom C to Pb calls into question the concept of a ``Universal Curve\u0027\u0027 for the\nphotoabsorption cross section per nucleon for all nuclei.",
"arxiv_id": "nucl-th/0303070",
"authors": [
"I. A. Pshenichnov",
"B. L. Berman",
"W. J. Briscoe",
"C. Cetina",
"G. Feldman",
"P. Heimberg",
"A. S. Iljinov",
"I. I. Strakovsky"
],
"categories": [
"nucl-th"
],
"doi": "10.1140/epja/i2004-10130-9",
"journal_ref": "Eur.Phys.J.A24:69-84,2005",
"title": "Evaluation of the total photoabsorption cross sections for actinides from photofission data and model calculations",
"url": "https://arxiv.org/abs/nucl-th/0303070"
},
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