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An effective low-energy description for multi-leg spin-1/2 Heisenberg ladderswith an odd number of legs is proposed. Using a newly developed Monte Carloloop algorithm and exact diagonalization techniques, the uniform and staggeredmagnetic susceptibility and the entropy are calculated for ladders with 1, 3,and 5 legs. These systems show a low-temperature scaling behavior similar tospin-1/2 chains with longer ranged unfrustrated exchange interactions. Thespinon velocity does not change as the number of legs increases, but the energyscale parameter decreases markedly.Comment: 4 pages and 5 figure

Low-energy properties of antiferromagnetic spin-1/2 Heisenberg ladders with an odd number of legs