INFLUENCE OF EVEN NUCLEON NUMBERS AND CLOSED SHELLS ON MASS AND CHARGE-DISTRIBUTION IN LOW-ENERGY FISSION

Download

index.pdf

Date

1994-06-01

Author

BUYUKMUMCU, Z
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

120
views

64
downloads

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 these different methods and are seen to be consistent with each other in spite of the somewhat different definitions of the even-odd effect. The even-odd effect decreases with an increasing fissility parameter. The EON values are substantially lower than the corresponding EOZ values, probably due to the effect of washing out the neutron pairing effect by prompt neutron emission. The magnitude of the even-odd effect varies with different mass regions. The EOZ and EON values decrease as they go from asymmetric to symmetric regions in mass distributions.

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/11511/67260

Journal

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES

DOI

https://doi.org/10.1007/bf02037558

Collections

Department of Engineering Sciences, 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.
FINE-STRUCTURE OF MASS AND CHARGE-DISTRIBUTION IN LOW-ENERGY FISSION ERTEN, HN; ARAS, NK (Springer Science and Business Media LLC, 1992-04-01) 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 exp...
Effect of biogenic substrate concentration on 4-chlorophenol degradation kinetics in sequencing batch reactors with instantaneous feed ŞAHİNKAYA, Erkan; Dilek, Filiz Bengü (Elsevier BV, 2006-09-01) Two sequencing batch reactors (SBRs) instantaneously fed with 200mg/l 4-chlorophenol (4-CP) were operated at different feed peptone concentrations to investigate the effect of biogenic substrate (peptone) concentrations on reactor performance, yield coefficient (Y) and 4-CP degradation kinetics. One of the reactors was operated at 10 days of sludge retention time (SRT) and the other was operated at 20 days of SRT. High chemical oxygen demand (COD) removal efficiencies (90-95%) and complete 4-CP removals (de...
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...
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 ...

Citation Formats

Z. BUYUKMUMCU, H. ERTEN, and N. ARAS, “INFLUENCE OF EVEN NUCLEON NUMBERS AND CLOSED SHELLS ON MASS AND CHARGE-DISTRIBUTION IN LOW-ENERGY FISSION,” JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES, pp. 175–188, 1994, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/67260.