Influence of the incident particle energy on the fission product mass distribution.

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For {sup 238}U targets and the five elements considered here, the best yields of neutron-rich isotopes are obtained from neutrons in the 2-20 MeV range. High energy beams of neutrons, protons, and deuterons have comparable integral yields per element to neutrons below 20 MeV, but the distributions are peaked at lower neutron numbers. This is presumably due to a higher neutron multiplicity in the pre-equilibrium stage and/or the compound nucleus/fission stage. For {sup 235}U targets there are high yields predicted especially for thermal neutrons, and also for the fast neutron spectrum. For the high energy neutrons, protons, and deuterons {sup ... continued below

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10 p.

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Gomes, I. C. August 26, 1998.

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For {sup 238}U targets and the five elements considered here, the best yields of neutron-rich isotopes are obtained from neutrons in the 2-20 MeV range. High energy beams of neutrons, protons, and deuterons have comparable integral yields per element to neutrons below 20 MeV, but the distributions are peaked at lower neutron numbers. This is presumably due to a higher neutron multiplicity in the pre-equilibrium stage and/or the compound nucleus/fission stage. For {sup 235}U targets there are high yields predicted especially for thermal neutrons, and also for the fast neutron spectrum. For the high energy neutrons, protons, and deuterons {sup 235}U has no advantage over {sup 238}U. A detailed comparison of the relative advantages of {sup 235}U and {sup 238}U for radioactive beam applications is beyond the scope of this study and will be addressed in the future. The present work is the first step of a more detailed analysis of various possible one- and two-step target geometry calculated with the LAHET code system. It is intended to serve as a guide in choosing geometry and beams for future studies. It is desirable to extend this study to higher beam energies, e.g. 200 to 1000 MeV, but at this time there is very little data against which to benchmark the analysis. Additional data would also permit comparisons of isotope yields beyond the tails of the distributions presented here, to even more neutron rich isotopes.

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10 p.

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INIS; OSTI as DE00010943

Medium: P; Size: 10 pages

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  • Topical Meeting on Nuclear Applications of Accelerator Technology, Gatlinburg, TN (US), 09/20/1998--09/23/1998

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  • Report No.: ANL/TD-FPP/CP-97197
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10943
  • Archival Resource Key: ark:/67531/metadc620933

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  • August 26, 1998

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  • June 16, 2015, 7:43 a.m.

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  • April 6, 2017, 6:55 p.m.

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Gomes, I. C. Influence of the incident particle energy on the fission product mass distribution., article, August 26, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc620933/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.