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RISS 인기검색어
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- 저자 : Koyumdjieva (검색결과 2 건)
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Influence of Resonance Effects in the Unresolved Resonance Region on ^(232)Th Data Evaluation
N. Koyumdjieva,N. Janeva,A. A. Lukyanov 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
A new evaluation of ^(232)Th has been completed in the unresolved resonance region (4 - 150) keV through a joint analysis of the experimental data on total and capture neutron cross sections, and self-shielding factor. Energy dependent neutron strength functions for s- and p- wave have been obtained so to reproduce the observable fluctuations in the average cross sections and to re-create the experimentally derived self-shielding factor values. The data analysis was accomplished by a statistical model based on the Wigner's theory of nuclear reactions and using a periodical cross section structure. The average resonance parameters of ^(232)Th from various evaluations have been validated by fit the self-shielding factor values. The influence of the cross section structure in the URR over the macroscopic characteristics of the reactor medium has been investigated.
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Neutron-Induced Activation Cross Sections on Hafnium Isotopes from the Threshold to 20 MeV
V. Semkova,N. Janeva,N. Koyumdjieva,R. Jaime Tornin,A. Moens,A. J. M. Plompen,K. Volev 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Results of new cross section measurements are presented for the following neutron-induced reactions: ^(178)Hf(n,α)^(175)Yb, ^(180)Hf(n,α)^(177)Yb, ^(177)Hf(n,p)^(177)Lu^g, ^(178)Hf(n,x)^(177)Lu^g, ^(180)Hf(n,p)^(180)Lu, ^(180)Hf(n,n'α)^(180)Hf^m, ^(174)Hf(n,2n) ^(173)Hf, ^(176)Hf(n,2n)^(175)Hf, and ^(177)Hf(n,3n)^(175)Hf obtained with the activation technique. The irradiations were carried out at the 7-MV Van de Graaff accelerator at IRMM, Geel. Quasi monoenergetic neutrons with energies between 14.8 and 20.5 MeV were produced via the ^3H(d,n)^4He reaction at E_d = 1, 1.4, 2, 3, and 4 MeV. The ^3H(p,n)^3He reaction was employed for the production of neutrons in the 2 - 3 MeV energy range. Both natural and enriched samples were used to facilitate correction for interference between reactions leading to the same product. The radioactivity of the samples was determined by standard γ-ray spectrometry using HPGe detector. The current measurements are compared with the data from other authors and Evaluated Nuclear Data Files. Cross sections for three of the studied reactions are reported for the first time.
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