41 research outputs found
Seesaw mechanism, baryon asymmetry and neutrinoless double beta decay
A simplified but very instructive analysis of the seesaw mechanism is here
performed. Assuming a nearly diagonal Dirac neutrino mass matrix, we study the
forms of the Majorana mass matrix of right-handed neutrinos, which reproduce
the effective mass matrix of left-handed neutrinos. As a further step, the
important effect of a non diagonal Dirac neutrino mass matrix is explored. The
corresponding implications for the baryogenesis via leptogenesis and for the
neutrinoless double beta decay are reviewed. We propose two distinct models
where the baryon asymmetry is enhanced.Comment: 21 pages, RevTex. Revise
Nuclear potentials for sub-barrier fusion and cluster decay in , + systems
Near-barrier fusion excitation functions for the C and O+Pb reactions have been analyzed in the framework of the barrier-passing model using different forms of the nuclear potential and the phenomenology of a fluctuating barrier. The best-fit fusion potentials were used to estimate cluster decay probabilities from the corresponding ground states of Ra and Th (i.e., for the inverse decay process). The analysis supports the “alpha-decay-like” scenario for carbon and oxygen emission from these nuclei
Sub-Barrier Fusion in the HI + Pb Systems and Nuclear Potentials for Cluster Decay
Near-barrier fusion excitation functions for the O + Pb reactions have been analyzed in the framework of the barrier-passing model using different forms of the nuclear potential and the phenomenology of a fluctuating barrier. The best-fit fusion potentials were used to estimate cluster decay probabilities from the corresponding ground states of Ra and Th, i.e., for the inverse decay process. The analysis supports the "alpha-decay-like" scenario for carbon and oxygen emission from these nuclei
Major factors influencing the generation of natural gas hydrate in porous media
Current researches related to natural gas hydrate mainly focus on its physical and chemical properties, as well as the approaches to the production (decomposition) of hydrate. Physical modeling of the flow process in hydrate deposits is critical to the study on the exploitation or decomposition of hydrate. However, investigation of the dynamic hydrate process by virtue of porous media like sand-packed tubes which are widely used in petroleum production research is rarely reported in literature. In this paper, physical simulation of methane hydrate generation process was conducted using river sand-packed tubes in the core displacement apparatus. During the simulation, the influences of parameters such as reservoir temperature, methane pressure and reservoir model properties on the process of hydrate generation were investigated. The following results are revealed. First, the use of ice-melted water as the immobile water in the reservoir model can significantly enhance the rate of methane hydrate generation. Second, the process driving force in porous media (i.e., extents to which the experimental pressure or temperature deviating those corresponding to the hydrate phase equilibrium) plays a key role in the generation of methane hydrate. Third, the induction period of methane hydrate generation almost does not change with temperature or pressure when the methane pressure is above 1.4 folds of the hydrate phase equilibrium pressure or the laboratory temperature is lower than the phase equilibrium temperature by 3 °C or more. Fourth, the parameters such as permeability, water saturation and wettability don't have much influence on the generation of methane hydrate
Study of the structure of the Hoyle state by refractive α-scattering
α + 12C elastic and inelastic to the Hoyle state (0+
2, 7.65 MeV)
differential cross-sections were measured at the energies 60 and 65 MeV with the aim of
testing the microscopic wave function [1] widely used in modern structure calculations of 12C. Deep rainbow (Airy) minima were observed in all four curves. The minima in the
inelastic angular distributions are shifted to the larger angles relatively those in the elastic
ones, which testify the radius enhancement of the Hoyle state. In general, the DWBA
calculations failed to reproduce the details of the cross sections in the region of the
rainbow minima in the inelastic scattering data. However, by using the phenomenological
density with rms radius equal 2.9 fm, we can reproduce the Airy minimum positions.peerReviewe
Cluster states in 11B
The differential cross-sections of the elastic and inelastic 11B + α scattering
was measured at E(α) = 65 MeV. The analysis of the data by Modified diffraction model
(MDM) showed that the RMS radii of the 11B state 3/2-, E* = 8.56 MeV is ~ 0.6 fm larger
than that of the ground state. The 12.56 MeV state was not observed contrary to the
predictions of the α-condensate model. The 13.1 MeV state was excited with the angular
momentum transfer L = 4 confirming its belonging to the rotational band with the 8.56
MeV state as a head.peerReviewe