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The effects of regular S=1 dilution of S=1/2 isotropic antiferromagneticchain are investigated by the quantum Monte Carlo loop/cluster algorithm. Ournumerical results show that there are two kinds of ground-state phases whichalternate with the variation of $S^1=1$ concentration. When the effective spinof a unit cell is half-integer, the ground state is ferrimagnetic with gaplessenergy spectrum and the magnetism becomes weaker with decreasing of the $S^1$concentration $\rho = 1/M$. While it is integer, a non-magnetic ground statewith gaped spectrum emerges and the gap gradually becomes narrowed as fitted bya relation of $\Delta \approx 1.25\sqrt{\rho}$.Comment: 6 pages, 9 figure

On the effect of a regularS= 1 dilution ofS= 1/2 antiferromagnetic Heisenberg chains obtained from quantum Monte Carlo simulations