E(MeV) energy resolution, now under construction. It is feasible to build a balloon filled with enriched xenon gas (with 136Xe up to 80%) dissolved in LS, inserted into the central region of the JUNO LS. The energy resolution is ~1.9% at the Q-value of 136Xe 0vββ decay. Ultra-low background is the key for 0vββ decay searches. Detailed studies of background rates from intrinsic 2vββ and 8B solar neutrinos, natural radioactivity, and cosmogenic radionuclides (including light isotopes and 137Xe) were performed and several muon veto schemes were developed. We find that JUNO has the potential to reach a sensitivity (at 90% C. L.) to T1/20vββ of 1.8×1028 yr (5.6×1027 yr) with ~50 tons (5 tons) of fiducial 136Xe and 5 years exposure, while in the 50-ton case the corresponding sensitivity to the effective neutrino mass, mββ, could reach (5-12) meV, covering completely the allowed region of inverted neutrino mass ordering."> Physics potential of searching for 0<em>v</em><em>β</em><em>β</em> decays in JUNO -
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