796 research outputs found
Energy Dependence of Total Cross Sections for Reactions with 4, 6he, 6, 7, 9li Nuclei
The paper presents the results of measurement of the total cross sections for reactions 4,6He + Si and 6,7,9Li + Si in the beam energy range 5−50 A⋅MeV. The enhancements of the total cross sections for reaction 6He + Si compared with reaction 4He + Si, and 9Li + Si compared with reactions 6,7Li + Si have been observed. The performed microscopic analysis of total cross sections for reactions 6He + Si and 9Li + Si based on numerical solution of the time-dependent Schrödinger equation for external neutrons of projectile nuclei 6He and 9Li yielded good agreement with experimental data
Total cross sections for the reactions Be+Si and B+Si
In this paper, the results of measurements of the total cross sections for
the reactions Be+Si and B+Si in the beam
energy range -- MeV are presented. The experimental cross sections
were obtained by detection of the gamma quanta and neutrons accompanying the
interaction of the isotopes of Be and B with Si. It was found that the
cross sections for Be are similar, but significantly exceed those for
Be. A significant increase in the cross sections for Be with
decreasing energy is observed in the entire measured energy range. A
theoretical explanation of the obtained experimental data is given based on the
microscopic model of deformed nuclei and the numerical solution of the
time-dependent Schr\"{o}dinger equation for the outer weakly bound neutrons of
the projectile nuclei. The calculated total reaction cross sections are in good
agreement with the experimental data
Experimental Investigations of Changes in beta-decay rate of Co-60 and Cs-137
Results of simultaneous measurements of beta-decay rate with the aid of
Ge(Li)-detectors performed at two laboratories 140km apart (INR RAS, Troitsk,
Co-60, and JINR, Dubna, Cs-137) during a period from 15.03.2000 till
10.04.2000, are presented. Regular deviations of the count rate of gamma-quanta
following the beta-decay of 0.7% (INR RAS, Co-60) and 0.2% (JINR,
Cs-137) from the statistical average, are observed. The analysis of extremum
deviations of gamma-quanta count rate shows that the set of directions of
tangents to the Earth's parallels of latitude at the extremum points of
trajectories of motion in the space of each laboratory clearly forms three
separate compact subsets of directions which agree, for two laboratories, to an
accuracy of . This phenomenon is shown not to be explained on the
basis of traditional notion. A possible explanation is suggested basing on the
hypothesis that there exists a new anisotropic interaction caused by the
cosmological vectorial potential \textbf{A}, a new fundamental
constant having, according to the experiments carried out, the coordinate of
right ascension in the second equatorial system.
This is in agreement with earlier experiments.Comment: 13 pages, LaTeX2e, 4 PS figure
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