Suppression of molecular decay in ultracold gases without Fermi statistics

We study inelastic processes for ultracold three-body systems in which only one interaction is resonant. We have found that the decay rates for weakly bound molecules due to collisions with other atoms can be suppressed not only without fermionic statistics but also when bosonic statistics applies. In addition, we show that at ultracold temperatures three-body recombination involving a single resonant pair of atoms leads mainly to formation of weakly bound molecules which, in turn, are stable against decay. These results indicate that recombination in three-component atomic gases can be used as an efficient mechanism for molecular formation, allowing the achievement of high molecular densities

Mass Dependence of Ultracold Three-Body Collision Rates

We show that many aspects of ultracold three-body collisions can be controlled by choosing the mass ratio between the collision partners. In the ultracold regime, the scattering length dependence of the three-body rates can be substantially modified from the equal mass results. We demonstrate that the only non-trivial mass dependence is due solely to Efimov physics. We have determined the mass dependence of the three-body collision rates for all heteronuclear systems relevant for two-component atomic gases with resonant s-wave interspecies interactions, which includes only three-body systems with two identical bosons or two identical fermions

DINAMIKA TENAGA KERJA SEKTOR PERTANIAN DI PROVINSI SULAWESI UTARA

This study aims to determine the dynamics of agricultural labor force of North Sulawesi Province. Re-search location in Manado (July to August 2010). Collecting data is secondary data research. The data were processed using the calculation of share of labor and labor force growth rate calculations. The re-sults showed employment growth rate of agriculture sector decreased by 5.78 percent per annum in the period of 2000-2009. While employment in non-agricultural sector increased by 1.78 percent each year. This indicates there is the tendency of structural transformation of agriculture labor to non-agricultural sector. Low tendency of Trade will be able to influence farmers to reduce or stop activities that agribusi-ness will affect the size of the agricultural labor share. Labor share of agriculture sector on the basis of education level is dominated by the level of primary education during the period 2007-2009 but its labor force growth rate has decreased each year in both rural and urban areas. Labor share of the agricultur-al sector based on the age group was dominated by the age of 55 years and above over the 2007-2009 period and is indicated by increasing the growth rate of labor force in rural and urban areas especially in urban areas despite a decline each year that tend to occur due to an increased energy agricultural labor in rural areas. Labor share of agriculture sector by district / city dominated by Bolaang Mongon-dow during the period 2007-2009, although rates of employment growth in agriculture sector has de-creased each year in both rural and urban areas. Labor share of agriculture sector based on the out-pouring of work hours was dominated by workers who work full (>35 hours) during the period 2007-2009 despite the decline in employment growth rates in both rural and urban areas each year.Keywords: Dynamics of Agricultural Labor Force, Structural Transformation, Labor Shar

Efimov Trimer Formation via Ultracold Four-body Recombination

We discuss the collisional formation of Efimov trimers via ultracold four-body recombination. In particular, we consider the reaction A+A+A+B->A3+B with A and B ultracold atoms. We obtain expressions for the four-body recombination rate and show that it reflects the three-body Efimov physics either as a function of collision energy or as a function of the two-body s-wave scattering length between A atoms. In addition, we briefly discuss issues important for experimentally observing this interesting and relatively unexplored process.Comment: 5 pages, 3 figure