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      Fine structure of mass and charge distribution in low energy fission

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      Author(s)
      Erten, H. N.
      Aras, N. K.
      Date
      1992
      Source Title
      Journal of Radioanalytical and Nuclear Chemistry
      Print ISSN
      0236-5731
      Publisher
      Akademiai Kiado Rt.
      Volume
      158
      Issue
      1
      Pages
      41 - 52
      Language
      English
      Type
      Article
      Item Usage Stats
      197
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      208
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      Abstract
      Studies of finer details in mass and charge distribution fission leads to a better understanding of the fission process. Experimental determination of independent and cumulative yields using radiochemical techniques as well as mass spectrometers and fission product recoil separators form the basis of such studies. It has been established that closed shells as well as an even number of nucleons influence both mass and charge distributions. The magnitudes of these effects may be estimated from existing experimental yield data and various fission models. Using our measurements of several fission yields and those existing in the literature we have calculated even-odd proton and neutron effects for various low energy fissioning systems. Where enough data existed, direct calculations were made, whereas for other cases the Zp-model of WAHL has been used. It is found that the even-odd proton effect is well established and pronounced in thermal neutron fission of235U and233U. Lesser effects were found for reactor neutron induced fission of232Th, thermal neutron fission of239Pu and spontaneous fission of245Cm and249Cf. No effect seems to exist in the thermal neutron fission of241Pu and the spontaneous fission of252Cf. The even-odd neutron effect is found to be much lower than the corresponding proton effect in235U and233U fissions and is nonexistent in the rest of the fissioning systems.
      Keywords
      Fission neutron
      Mathematics
      Radiochemistry
      Permalink
      http://hdl.handle.net/11693/26112
      Published Version (Please cite this version)
      https://doi.org/10.1007/BF02034771
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      • Department of Chemistry 707
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