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We investigate a one-dimensional S=1/2 antiferromagnetic Heisenberg modelcoupled to quantum lattice vibration using a quantum Monte Carlo method. Westudy the ground-state lattice fluctuation where the system shows acharacteristic structure factor. We also study the mass dependence of magneticproperties such as the magnetic susceptibility and the magnetic excitationspectrum. For heavy mass, the system shows the same behavior as the case ofclassical lattice vibration. On the other hand, for light mass, magneticproperties coincide with those of the static uniform chain. We investigate thephysical mechanism of this behavior and propose the picture of quantumnarrowing.Comment: 7 pages, 16 eps figures embedded in the text; added comments in  section 3, corrected typo

Quantum Narrowing Effect in a Spin–Peierls System with Quantum Lattice Fluctuation