Chiral symmetry breaking and stability of strangelets

We discuss stability of strangelets in view of chiral symmetry breaking. For quark droplets of finite volume we formulate the Nambu--Jona-Lasinio model with a basis set of the quark wave functions in the chiral bag model. For strangelets with large baryon number A>10, we use the Multiple Reflection Expansion as an approximate method to consider the boundary condition of the bag. For small baryon numbers, we consider the pion cloud by assuming a strong coupling between pion and quark at the bag surface. Physical quantities of the quark droplets such as masses and radii are obtained from baryon number A=1 to A=10^9. We apply our model setting to the nucleon and discuss the stability of the quark droplets against nuclei.