New limits on di-nucleons decay into invisible channels

Abstract

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.

arXiv comment3 pages, accepted in JETP Letters

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• The Hierarchy Problem and New Dimensions at a Millimeter
• A Unified Approach to the Classical Statistical Analysis of Small Signals
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