Data of the radiochemical experiment [E.L.Fireman, 1978] with 1.7 t of KC_2H_3O_2, accumulated deep underground during ~1 yr, were reanalyzed to set limits on di-nucleons (nn and np) decays into invisible channels (disappearance, decay into neutrinos, etc.). The obtained lifetime bounds tau_np > 2.1 10^25 yr and tau_nn > 4.2 10^25 yr (at 90% C.L.) are better (or competitive) than those established in the recent experiments.
@article{arxiv.nucl-ex/0401022,
title = {New limits on di-nucleons decay into invisible channels},
author = {V. I. Tretyak and V. Yu. Denisov and Yu. G. Zdesenko},
journal= {arXiv preprint arXiv:nucl-ex/0401022},
year = {2008}
}