A Search for Neutrinoless Double Beta Decay with NEMO-3

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A Search for Neutrinoless Double Beta Decay with NEMO-3 Kiyotaka Yamazaki
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A Search for Neutrinoless Double Beta Decay with NEMO-3. Kiyotaka Yamazaki. 150 Nd. A source foil contains Nd 2 O 3 with 37.0±0.1g of 150 Nd (~90% of the foil) 150 Nd is a 2 νββ isotope with Q ββ =3367keV -Second highest of all 2 νββ isotopes (Q ββ ( 48 Ca)=4271kev) - PowerPoint PPT Presentation

Transcript of A Search for Neutrinoless Double Beta Decay with NEMO-3

  • A Search for Neutrinoless Double Beta Decay with NEMO-3Kiyotaka Yamazaki

  • 150Nd A source foil contains Nd2O3 with 37.00.1g of 150Nd (~90% of the foil)

    150Nd is a 2 isotope with Q=3367keV -Second highest of all 2 isotopes (Q (48Ca)=4271kev)

    The highest phase factor in all 2 isotopes.

  • Phase 1 and Phase 2Nuclear Instruments and Methods in Physics Research A 606 (2009) 449465Radon diffusion through the joints of the sectors

    Radon-free facility was installed in September 2004

    Phase1: A(Rn) = 37.70.1 mBq/m3

    Phase1: A(Rn) = 6.460.02 mBq/m3

  • Background analysis -1e1 channelEC (e.g. 207Bi, 152Eu) -daughter nucleus de-excites by emission of photon and electron is ejected via internal conversion. -decay to an excited states (e.g. 152Eu, 154Eu) -daughter nucleus de-excites by emission of photon

    -decay and 2 emission (e.g. 208Tl) -daughter nucleus de-excites by emission of 2 photons but it is possible that one of photon is not detected.

  • Background analysis -1e1 channelPhase 1 Phase 2Energy Sum

    Energy ofElectron

  • ButNasim FATEMI-GHOMI thesis 2009

    A(208Tl)= 0.470.05 mBq924.7days1402.1days in TotalA(208Tl)= 1.250.1 mBq

  • 2e channelT1/2=(9.030.04)1018 years

  • Next yearMain goal is to publish all the 150Nd resultsAnalysis of full-set of the dataRadon ProblemMore background analysis- with 1e, 1e2 channelAnd 0 analysis