669 research outputs found
The absorbed energy in the Shroud body image formation appears as contributed by discrete values
Starting from the optical density distribution in the Shroud body image and without any assumption on the mechanism that acts at a distance, we deduce that the absorbed energy by the Linen of Turin, related to the human body shape presence, is due to the contribution of discrete energy values
Main restrictions in the synthesis of new superheavy elements: quasifission or/and fusion-fission
The synthesis of superheavy elements stimulates the effort to study the
peculiarities of the complete fusion with massive nuclei and to improve
theoretical models in order to extract knowledge about reaction mechanism in
heavy ion collisions at low energies. We compare the theoretical results of the
compound nucleus (CN) formation and evaporation residue (ER) cross sections
obtained for the Ca+Cm and Fe+Th reactions
leading to the formation of the isotopes A=296 and A=290, respectively, of the
new superheavy element Lv (Z=116). The ER cross sections, which can be measured
directly, are determined by the complete fusion and survival probabilities of
the heated and rotating compound nucleus. That probabilities can not be
measured unambiguously but the knowledge about them is important to study the
formation mechanism of the observed products. For this aim, the
Ca+Cf and Ni+Th reactions have been considered
too. The use of the mass values of superheavy nuclei calculated in the
framework of the macroscopic-microscopic model by Warsaw group leads to smaller
ER cross section for all of the reactions (excluding the Ni+Th
reaction) in comparison with the case of using the masses calculated by Peter
M\"oller {\it et al}.Comment: 26 pages and 15 figures. arXiv admin note: text overlap with
arXiv:1109.201
Peculiarities of Nuclear Fusion in Synthesis of Superheavy Elements
The small probabilities of synthesis of new superheavy elements at GSI (Darmstadt, Germany), Joint Institute for Nuclear Research (Dubna, Russia), and RIKEN (Wako, Japan) during the last decade stimulate the experimental and theoretical studies of the nuclear reaction mechanism. 1– 4 In preparation of these experiments, the main aim is to reach maximum cross sections of the yield of evaporation residues (ER) as a result of the de-excitation of the heated compound nucleus which is formed in complete fusion of the projectile and target nuclei. Because the ER excitation function in the synthesis of superheavy elements has very narrow width for "cold fusion" reactions (5–10 MeV) with 208 Pb and 209 Bi targets 5 and the width of the "hot fusion" reactions with 48 Ca projectile on actinide ta
Soil Geosynthetic Interaction: Design Parameters from Experimental and Theoretical Analysis
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Bremsstrahlung emission during -decay of
We obtained the spectrum of probability of the bremsstrahlung emission
accompanying the -decay of (E=4.8 MeV) by
measuring the - coincidences and using the model presented in
our previous study on the decay of (E=7.7
MeV). We compare the experimental data with the quantum mechanical calculation
and find a good agreement between theory and experiment. We discuss the
differences between the photon spectra connected with the -decay of the
and nuclei. For the two mentioned nuclei we
analyze the bremsstrahlung emission contributions from the tunneling and
external regions of the nucleus barrier into the total spectrum, and we find
the destructive interference between these contributions. We also find that the
emission of photons during tunneling of the -particle gives an
important contribution to the bremsstrahlung spectrum in the whole E
energy range of the studied Ra nucleus
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