First results of the search for neutrinoless double beta decay with the NEMO 3 detector
Phys. Rev. Lett. 95 (2005) 182302
The NEMO 3 detector, which has been operating in the Fréjus underground laboratory since February 2003, is devoted to the search for neutrinoless double-beta decay (ββ0ν). The half-lives of the two neutrino double-beta decay (ββ2ν) have been measured for 100Mo and 82Se.
After 389 effective days of data collection from February 2003 until September 2004 (phase I), no evidence for neutrinoless double-beta decay was found from ∼7 kg of 100Mo and ∼1 kg of 82Se.
The corresponding limits are T1/2(ββ0ν)>4.6×1023 yr
for 100Mo and T1/2(ββ0ν)>1.0×1023 yr for 82Se (90% C.L.). Depending on the nuclear matrix element calculation, the limits for the effective Majorana neutrino mass are 〈mν〉 < 0.7 — 2.8 eV for 100Mo and 〈mν〉 < 1.7 — 4.9 eV for 82Se.
Cite article as:
. NEMO Collaboration, "First results of the search for neutrinoless double beta decay with the NEMO 3 detector", Phys. Rev. Lett. 95 (2005) 182302 (2005)