Experimental Test of the Method of Calculating Cross Sections of Photonuclear Reactions on the Basis of Mathematical Statistics

Author(s):  
V. G. Ivanchenko ◽  
B. S. Ratner
Author(s):  
Й. З. Беседа ◽  
В. С. Бохінюк ◽  
А. І. Гутій ◽  
А. П. Осипенко ◽  
Н. В. Пащенко ◽  
...  

1953 ◽  
Vol 31 (2) ◽  
pp. 250-261 ◽  
Author(s):  
L. Katz ◽  
R. G. Baker ◽  
R. Montalbetti

The photoneutron cross sections of the 50-neutron isotopes Rb87, Zr90, and Mo92 have been measured as a function of photon energy. These cross sections exhibit the peaked shape characteristic of photonuclear reactions. Peak values of 0.23, 0.27, and 0.14 barn at 17.5, 18.0, and 18.7 Mev. respectively were found for these nuclei. The widths of all the curves at half maximum were about 6 Mev. In the case of zirconium and molybdenum the cross sections to the isomeric and ground states of the residual nuclei have been determined separately. The ratio of the cross sections, σ ground/σ isomeric, has been examined as a function of photon energy and is discussed in the light of the elementary analysis previously presented.


2020 ◽  
pp. 148-153
Author(s):  
A.N. Vodin ◽  
O.S. Deiev ◽  
I.S. Timchenko ◽  
S.N. Olejnik ◽  
A.S. Kachan ◽  
...  

The flux-weighted averaged over the energy range of bremsstrahlung spectrum from reaction threshold up to the maximum energy of γ-ray cross-sections <σ(E)> of the 93Nb(γ,n)92mNb and 93Nb(γ,n)92tNb photonuclear reactions were determined by the gamma-activation method within the end-point bremsstrahlung energies Еmax = 36…91 MeV. Activation of 93Nb targets has been done by a bremsstrahlung flux using an electron beam at the linear accelerator LUE-40 at RDC "Accelerator" NSC KIPT. The γ-ray spectra of irradiated targets were registered using the HPGe detector with an energy resolution of 1.8 keV for the 1332 keV line 60Co. To control the bremsstrahlung flux we used natMo witness-targets and a reaction cross-section of 100Mo(γ,n)99Mo. Obtained experimental cross-sections <σ(E)> of the studied reactions are in good agreement with the theoretical values calculated within TALYS 1.9 code and the results of other authors. The averaged cross-sections <σ(E)> of the 93Nb(γ,n)92mNb and 93Nb(γ,n)92tNb reactions in the energy range 35...45 MeV and > 70 MeV were obtained for the first time.


Atomic Energy ◽  
2000 ◽  
Vol 88 (5) ◽  
pp. 408-413 ◽  
Author(s):  
A. G. Belov ◽  
Yu. P. Gangrskii ◽  
K. K. Gudima ◽  
P. Zuzaan

2020 ◽  
Vol 24 (3) ◽  
pp. 501-518
Author(s):  
Lyudmila V. Fedina

Introduction. Impetuous changes provoke a research into structural and substantive changes in modern childhood. Presentation of modern preschoolers differs from what their peers thought 10 and 20 years ago. It is necessary to determine the basis of preschool children’s self-image and to identify those specifications that remain unchanged and those that demonstrate significant changes. This will help to understand the fundamentals of building an internal image of a modern preschooler, highlight changes in its structure, and predict effective ways to accompany the development of a preschooler’s personality. Aim of the research: study the content components of the “self-image” of preschoolers, identify and describe the main dynamic trends in the self-image of preschoolers over the course of 13 years. Materials and Methods. The study of meaningful changes in the preschoolers’ ideas about themselves was organized using an interview. 211 preschoolers aged between 5 and 7 years old were interviewed. The study used the methods of cross-sections, the Kuhn-McPartland test modified by T. V. Rumyantseva, the method of studying the “self-image” by G. A. Uruntaeva and E. N. Gosheva, methods of mathematical statistics in the SPSS program. Results. The reflexive ego and the communicative ego are determined in the structure of the identification indicators of the self-image of the older preschooler as the stable characteristics. The dynamic tendencies are highlighted: modern preschoolers, in comparison with their peers in 2004, demonstrate more freedom and diversity in describing the identification characteristics of their physical ego and activity ego, at the same time they lose focus on relationships in the context of “me-others” (“social ego”). A comparative analysis made it possible to identify the zone of development of the self-image of modern preschoolers and the basis for the reconstruction of forms and methods of teaching and upb ringing. Discussion and Conclusion. The results of the research are important for the psychology of modern childhood. They clarify and supplement the description of the age-related characteristics of the development of self-awareness of modern preschoolers. The study allows us to place significant accents in the development of educational programs for preschool children in practice.


Author(s):  
V.M. Gorbachev ◽  
Y.S. Zamyatnin ◽  
A.A. Lbov

2021 ◽  
pp. 62-69
Author(s):  
Hao Sen, Hao Mengyuan

Starting from the outdoor tennis competition, this paper studies the load characteristics of tennis competition through the experimental test of outdoor tennis players. This paper mainly adopts four research methods: literature, experimental test, mathematical statistics and logical analysis. This paper analyzes the load characteristics of outdoor tennis players in singles through experiments on the characteristics of competition time, the changes of center rate in the process of competition and the changes of creatine kinase, blood urea and urinary protein before and after competition. The results showed that the content of creatine kinase in blood increased significantly and the protein in urine increased significantly. This shows that outdoor tennis competition is more intense. The increase of blood urea after competition shows that there is a certain load in outdoor tennis competition, but the load is relatively small. The small load is mainly due to the short time of outdoor tennis competition, so the content of blood urea will not increase significantly.


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