نتایج جستجو برای: spontaneous fission
تعداد نتایج: 129113 فیلتر نتایج به سال:
Spontaneous mutations, and those induced by nitrous acid or ultraviolet light, were studied in the haploid fission yeast Schizosaccharomyces pombe. Reverse mutations conferring ability to grow on a minimal medium lacking adenine were scored in adenine auxotrophs, and in di-auxotrophs having requirements for both adenine and methionine. The apparently lower mutability of the ad-1 mutants in the ...
In this work, we have used the liquid-drop model in the context of stabilized jellium model, to study the stability of Z-ply charged metal clusters of different species against fragmentation. We have shown that on the one hand, singly ionized clusters are stable against any spontaneous fragmentation, and on the other hand, the most favored decay process for them is atomic evaporation. However, ...
Superheavy elements owe their existence exclusively to nuclear shell effects which stabilize them against spontaneous fission (SF). Theoretical predictions locate the center of stability at the hypothetical doubly-magic spherical nucleus with Z=114 and N=184 [1]. Calculations with the inclusion of higher orders of deformation [2] suggest the ground state shell correction energy of deformed nucl...
Fossil tracks of charged particles have been observed in minerals separated from the Vaca Muerta mesosiderite. Irradiation of samples of the meteorite with thermal neutrons in a nuclear reactor, together with measurements of track-length distribution, indicate that some of the tracks result from the spontaneous fission of uranium impurities; others, however, are of different origin. Uranium con...
An organic scintillator-based radiation portal monitor (RPM) prototype system with imaging capabilities has been developed based on the neutron–gamma emission tomography technique. The technique enables rapid detection and precise location of small amounts special nuclear materials, such as plutonium, using time energy correlations between fast neutrons gamma rays from spontaneous fission low f...
The fusion reactions involving deuterium are of great interest for the exploitation energy via magnetic-confinement devices. In classical thermodynamics, spontaneity a process is established through assessment change in Gibbs free energy. So far, feasibility nuclear has been characterized terms cross section and Q-value while entropic term (T ΔS) neglected. Such an assumption always justified f...
The genetic maps of the fission yeast Schizosaccharomyces pombe were extended through the use of haploidization (spontaneous or induced by m-fluorophenylalanine), as well as by tetrad, random spore and mitotic analysis. A new diploidization method utilizing a meiosis-deficient mutant and improved haploidization techniques was employed. As a result of these and previous studies, 118 genetic mark...
A new region of proton-rich parent nuclei decaying by spontaneous cluster emission with a measurable branching ratio relative to alpha decay is predicted within the analytical superasymmetric fission model. After a brief presentation of the model and of the seven mass tables used to calculate the released energy, the obtained results are discussed. Measurable half-lives and branching ratios are...
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