Momentum-resolved radio-frequency spectroscopy of a spin-orbit coupled atomic Fermi gas near a Feshbach resonance in harmonic traps

We theoretically investigate the momentum-resolved radio-frequency spectroscopy of a harmonically trapped atomic Fermi gas near a Feshbach resonance in the presence of equal Rashba and Dresselhaus spin-orbit coupling. The system is qualitatively modeled as an ideal gas mixture of atoms and molecules, in which the properties of molecules, such as the wavefunction, binding energy and effective mass, are determined from the two-particle solution of two-interacting atoms. We calculate separately the radio-frequency response from atoms and molecules at finite temperatures by using the standard Fermi golden rule, and take into account the effect of harmonic traps within local density approximation. The total radio-frequency spectroscopy is discussed, as functions of temperature and spin-orbit coupling strength. Our results give a qualitative picture of radio-frequency spectroscopy of a resonantly interacting spin-orbit coupled Fermi gas and can be directly tested in atomic Fermi gases of K40 atoms at Shanxi University and of Li6 atoms at MIT.Comment: 11 pages, 9 Figure

Two-channel model description of confinement-induced Feshbach molecules

Using a two-channel model, we investigate theoretically the binding energy of confinement-induced Feshbach molecules in two- and one-dimensional ultracold atomic systems, near a Feshbach resonance. We show that the two-channel prediction will evidently deviate from the simple single-channel theory as the width of Feshbach resonances decreases. For one-dimensional system, we perform a full two-channel calculation, with the inclusion of bare interatomic interactions in the open channel. Away from the resonance, we find a sizable correction to the binding energy, if we neglect incorrectly the bare interatomic interactions as in the previous work [Dickerscheid and Stoof, Phys. Rev. A 72, 053625 (2005)]. We compare our theoretical results with existing experimental data and present predictions for narrow Feshbach resonances that could be tested in future experiments.Comment: 8 pages, 5 figure

Effect of egg weight on ostrich (Struthio camelus) chick weight and growth

The aim of this paper is to evaluate the effects of the age of ostriches and month of laying on egg production and chickgrowth. On a small ostrich farm egg production, egg incubation and chick growth from hatching to 56 days of age wererecorded from 2000, when the breeders were 5 years old, until 2002. Ostriches were kept in groups and fed commercialfeed. In all, 568 eggs were laid and weighed at laying and during incubation (at 15th and 30th day of incubation), while353 chicks were weighed at hatching, 7, 14, 28 and 56 days of age.The female’s productivity was calculated assuming a laying of 3.5 eggs per week and ranged between 45% and 48%.The fertility was around 70% with a peak of 74% recorded in 2001. The hatchability of all eggs was higher than 62%with a peak of 72% in 2001, while the hatchability of fertile eggs was higher than 90%. In each year the number of eggslaid increased from March to July, productivity showed a positive trend from May to June, while the fertility and hatchabilityof all eggs, as well as fertile eggs, was unaffected by year and month. As the hens aged, the egg mass grew constantlywith an increase of about 8%. During the first 30 days of incubation the egg weight decreased with the percentagesof weight loss around 10.0%. At hatching, the weight of chick ranged between 765 g and 847 g, respectively, in2000 and 2002. Egg weight influenced the hatching weight showing a linear relationship (R2=0.84). The effect of eggweight on the chick weight decreased as the chick grew. At 56 days of age, only the effect of year is significant. Themonth of laying did not demonstrate any effect on chicken weight