x / 06 01 02 1 v 1 1 3 Ja n 20 06 Limits on different Majoron decay modes of 100 Mo and 82 Se for neutrinoless double beta decays in the NEMO - 3 experiment
نویسندگان
چکیده
The NEMO-3 tracking detector is located in the Fréjus Underground Laboratory. It was designed to study double beta decay in a number of different isotopes. Presented here are the experimental half-life limits on the double beta decay process for the isotopes 100Mo and 82Se for different Majoron emission modes and limits on the effective neutrino-Majoron coupling constants. In particular, new limits on ”ordinary” Majoron (spectral index 1) decay of 100Mo (T1/2 > 2.7 ·10 22 y) and 82Se (T1/2 > 1.5 · 10 22 y) have been obtained. Corresponding bounds on the Majoronneutrino coupling constant are 〈gee〉 < (0.4 − 1.9) · 10 −4 and < (0.66 − 1.7) · 10−4. PACS: 23.40.-s, 14.80.Mz
منابع مشابه
Se p 20 06 Measurement of double beta decay of 100 Mo to excited states in the NEMO 3 experiment
The double beta decay of 100Mo to the 01 and 2 + 1 excited states of 100Ru is studied using the NEMO 3 data. After the analysis of 8024 h of data the half-life for the two-neutrino double beta decay of 100Mo to the excited 01 state is measured to be T (2ν) 1/2 = [5.7 +1.3 −0.9(stat)±0.8(syst)]·10 y. The signal-to-background ratio is equal to 3. Information about energy and angular distributions...
متن کامل2 v 1 3 D ec 2 00 4 Search for neutrinoless double beta decay with the NEMO - 3 detector : first results
The NEMO-3 detector, which has been operating in the Fréjus Underground Laboratory since February 2003, is devoted to searching for neutrinoless double beta decay (ββ0ν). The expected performance of the detector has been successfully achieved. Half-lives of the two neutrinos double beta decay (ββ2ν) have been measured for 150 Nd. After 265 days of data collection from February 2003 until March ...
متن کاملar X iv : h ep - e x / 03 06 02 7 v 1 1 1 Ju n 20 03 STATUS REPORT ON THE NEMO 3 EXPERIMENT
The NEMO 3 detector, now operating in the Fréjus Underground Laboratory, is devoted to search for neutrinoless double beta decay ; the expected sensitivity for the effective neutrino mass (< mν >) is on the order of 0.1 eV. The performances of the tracking detector are presented. The first and very preliminary results concerning the background and the double beta signal are given.
متن کاملNemo-3 Double Beta Decay Experiment: Lastest Results
Latest results on 0νββ, 0νχ 0 ββ and 2νββ decays of different isotopes from NEMO-3 double beta decay experiment are presented. In particular, new limits at 90% C.L. on neurtinoless double beta decay of 100 M o and 82 Se have been obtained, T 1/2 > 5.8 × 10 23 y and T 1/2 > 2.1 × 10 23 y, respectively.
متن کاملNemo 3 Experiment : Preliminary Results from 2003 Data
The NEMO-3 detector installed in the Modane Underground Laboratory (LSM, France) is running to search for neutrinoless double beta decay (ββ0ν) with an expected sensitivity for the effective Majorana neutrino mass down to 0.1 eV. New preliminary limits (90% CL), T 1/2 (ββ0ν) > 1.0 · 10 23 y (right-handed currents) and T 1/2 (ββ0ν) > 1.9 · 10 23 y (massive mechanism) were established analyzing 1...
متن کامل