First Results of the Search for Neutrinoless Double-Beta Decay with the NEMO 3 Detector
- IReS, IN2P3-CNRS and ULP, 67037 Strasbourg (France)
- LAL, IN2P3-CNRS and UPS, 91405 Orsay (France)
- INL, Idaho Falls, Idaho 83415 (United States)
- ITEP, 117259 Moscow (Russian Federation); and others
The NEMO 3 detector, which has been operating in the Frejus underground laboratory since February 2003, is devoted to the search for neutrinoless double-beta decay ({beta}{beta}0{nu}). The half-lives of the two neutrino double-beta decay ({beta}{beta}2{nu}) have been measured for {sup 100}Mo and {sup 82}Se. 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 {approx}7 kg of {sup 100}Mo and {approx}1 kg of {sup 82}Se. The corresponding limits are T{sub 1/2}({beta}{beta}0{nu})>4.6x10{sup 23} yr for {sup 100}Mo and T{sub 1/2}({beta}{beta}0{nu})>1.0x10{sup 23} yr for {sup 82}Se (90% C.L.). Depending on the nuclear matrix element calculation, the limits for the effective Majorana neutrino mass are <m{sub {nu}}><0.7-2.8 eV for {sup 100}Mo and <m{sub {nu}}><1.7-4.9 eV for {sup 82}Se.
- OSTI ID:
- 20699489
- Journal Information:
- Physical Review Letters, Vol. 95, Issue 18; Other Information: DOI: 10.1103/PhysRevLett.95.182302; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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