Abstract
We report on trapping of bosonic 41K atoms in a magneto-optical trap. Typically 106 atoms are loaded at a density of 109 cm3. Since this was the _rst time we trapped 41K atoms in our experiment, some characteristic measurements were needed. Dependence of trapping atom numbers due to the magnetic _eld gradient, total cooling laser power, power ratio of trapping and repumping beam, and the red detuning below F'= 3 state were measured and compared in our results. We also try to estimate our trapped atom numbers and densities in a more precise way by absorption image. In the last part, the event we are undergoing is the heteronuclear atomic collisions between 41K and 85Rb at temperature about few hundred micro-Kelvin.