FINE-STRUCTURE OF MASS AND CHARGE-DISTRIBUTION IN LOW-ENERGY FISSION

Download

index.pdf

Date

1992-04-01

Author

ERTEN, HN
ARAS, NK

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

204
views

0
downloads

Studies of finer details in mass and charge distribution in 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 Z(p)-model of WAHL has been used. It is found that the even-odd proton effect is well established and pronounced in thermal neutron fission of U-235 and U-233. Lesser effects were found for reactor neutron induced fission of Th-232, thermal neutron fission of Pu-239 and spontaneous fission of Cm-245 and Cf-249. No effect seems to exist in the thermal neutron fission of Pu-241 and the spontaneous fission of Cf-252. The even-odd neutron effect is found to be much lower than the corresponding proton effect in U-235 and U-233 fissions and is nonexistent in the rest of the fissioning systems.

Subject Keywords

Analytical Chemistry, Spectroscopy, Public Health, Environmental and Occupational Health, Nuclear Energy and Engineering, Pollution, Health, Toxicology and Mutagenesis, Radiology Nuclear Medicine and imaging

URI

https://hdl.handle.net/11511/65689

Journal

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES

DOI

https://doi.org/10.1007/bf02034771

Collections

Department of Chemistry, Article

Suggestions

OpenMETU
Core

Determination of pre-scission kinetic energy in low energy fission using Isotonic Charge Distribution Model Buyukmumcu, Z; Kildir, M; Aras, NK (Springer Science and Business Media LLC, 1996-04-01) The parameters of Isotonic Charge Distribution Model have been calculated for several isotones of three law energy fissioning systems. The global charge even-add effects are determined as 0.27 +/- 0.04 for thermal neutron induced fission of U-233(U233T), 0.27 +/- 0.05 for U235T and 0.13 +/- 0.05 for PU239T. The pre-scission kinetic energies for U235T and PU239T are estimated and found to be similar to 16 MeV.
Radiation induced chain addition of allylbenzene to 1,4-dioxane Nesterov, SV; Kucukyavuz, S; Önal, Ahmet Muhtar (Springer Science and Business Media LLC, 1999-06-01) Radiation induced chain addition of allylbenzene to 1,4-dioxane has been studied by IR-, UV-, mass-, NMR- and ESR-spectrometry. Efficiency of the addition depends on the concentration of monomer and it has an optimum at C-monom<0.125M. Apparently, upper concentration limit of the reaction is caused by absorbed energy transfer on the molecule of monomer followed by energy deactivation. Radiation-chemical yields of the product are 12 and 31 molec./100 eV for 0.125M and 0.07M solution, respectively. The value ...
INFLUENCE OF EVEN NUCLEON NUMBERS AND CLOSED SHELLS ON MASS AND CHARGE-DISTRIBUTION IN LOW-ENERGY FISSION BUYUKMUMCU, Z; ERTEN, HN; ARAS, NK (Springer Science and Business Media LLC, 1994-06-01) Extensive experimental and evaluated yield data are now available for the fragments in low energy nuclear fission. Using these data we re-examined the influence of even nuclear numbers and closed shells on the mass and charge distribution in low energy fission. We used WAHL's Zp model and Ap model. We also examined the effects of Z = 50, N = 82 and possibly N = 88 shells. A new method was developed based on two Gaussian curves for the even and odd products. The EOZ and EON values calculated are based on the...
Trace level determination of beryllium in natural and flavored mineral waters after pre-concentration using activated carbon KILINÇ, ERSİN; Bakirdere, Sezgin; YAMAN, MEHMET (Informa UK Limited, 2011-01-01) The concentrations of beryllium (Be) in natural and flavored mineral water samples were determined by flame atomic absorption spectrophotometer (FAAS) after pre-concentration based on the complexation of Be(+2) with a mixture of acetylacetone (pentane-2,4-dione) plus morin (3,5,7,2',4'-pentaoxyflavone) and adsorption on activated carbon. The adsorbed complex was eluted with 1.5 ml of 2.0 M HNO(3) and evaporated to dryness. After adding 1.5 ml of 2 M HNO(3) and centrifuging, Be in acid solution was determine...
Gamma-radiation initiated addition of allylbenzene to the morpholine Nesterov, SV; Kucukyavuz, S; Önal, Ahmet Muhtar (Springer Science and Business Media LLC, 1999-10-01) Radiation induced addition of allylbenzene to morpholine in liquid state was investigated by UV-, IR-spectroscopy and GS/mass spectrometry. Conversion of monomer depends on its initial concentration in the solution and this value is maximum for 0.05M solution. Radiation chemical yield of the product, G(prod), increases with concentration of allylbenzene and for 0.15M solution it is equal approximately 9.7 molec/100 eV. This value points on chain character of the process. Final product was identified by elec...

Citation Formats

H. ERTEN and N. ARAS, “FINE-STRUCTURE OF MASS AND CHARGE-DISTRIBUTION IN LOW-ENERGY FISSION,” JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES, pp. 41–52, 1992, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/65689.