Postprint version. Published in Astroparticle Physics, Volume 34, Issue 8, March 1, 2011, pages 643-648.
The definitive version is available at https://doi.org/10.1016/j.astropartphys.2010.12.011.
We present a search for β+/EC double beta decay of 120Te performed with the CUORICINO experiment, an array of TeO2 cryogenic bolometers. After collecting 0.0573 kg · y of 120Te, we see no evidence of a signal and therefore set the following limits on the half-life: T0v 1/2 > 1.9 · 1021 y at 90% C.L. for the 0v mode and T2v1/2 > 7.6 · 1019 y at 90% C.L. for the 2v mode. These results improve the existing limits by almost three orders of magnitude (four in the case of 0v mode).