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A Search of Neutrino Magnetic Moment at the Kuo-Sheng Power Plant in Taiwan

A Search of Neutrino Magnetic Moment at the Kuo-Sheng Power Plant in Taiwan. TEXONO Collaboration : Overview Kuo-Sheng Reactor Neutrino Lab. ※ Magnetic Moments Results with ULB-HPGe Other Physics, Status and Plans. Hau-Bin Li Academia Sinica EPS03, Aachen. TEXONO Overview.

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A Search of Neutrino Magnetic Moment at the Kuo-Sheng Power Plant in Taiwan

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  1. A Search of Neutrino Magnetic Moment at the Kuo-Sheng Power Plant in Taiwan • TEXONO Collaboration : Overview • Kuo-Sheng Reactor Neutrino Lab. ※Magnetic Moments Results with ULB-HPGe • Other Physics, Status and Plans Hau-Bin Li Academia Sinica EPS03, Aachen

  2. TEXONO Overview Program: • Kuo-Sheng Reactor Neutrino Laboratory ※ reactor : high flux of low energy electron anti-neutrinos ※mn0  anomalous n properties & interactions • ※ n physics full of surprises • study/constraint new regime wherever possible experimentally • explore possible new detection channels • R&D Projects Achieved : • KS Expt:1st particle physics experiment in Taiwan • TEXONO Coll. : 1st big research Coll. % Taiwan & China [feature report in Science, Vol. 300, 1074 (2003) ]

  3. Kuo-Sheng Nuclear Power Plant KS NPS-II : 2 cores  2.9 GW KS nLab: 28 m from core#1

  4. Kuo Sheng Reactor Neutrino Laboratory Front Gate Front View (cosmic vetos, shieldings, control room …..) Configuration: Modest yet Unique Flexible Design: Allows different detectors conf. for different physics Inner Target Volume

  5. KS Expt. : Period I Configuration Period I : June 01 – April 02 (60 days OFF) Shielding & Veto [one side] ULB-HPGe + Anti-Comptons CsI(Tl) Array (46 kg)

  6. KS Expt: Period I Detectors ULB-HPGe [1 kg] CsI(Tl) [46 kg] FADC Readout [16 ch., 20 MHz, 8 bit] Multi-Disks Array [600 Gb]

  7. mn with Reactor ne • mn  parametrize possible niLnjR + g vertices   both i = j “diagonal” & i  j “transition” moments • Experimental Probe:  Study ne + e- nX + e-  Focus on low recoil energy ※ sm  T–1 ※ decouples SM “background” [ ……… LE reactor f(ne) not accurately known]  Look for Excess in Reactor ON/OFF • Neutrino Radiative Decay (Gn):  sm & Gn related:  same vertices – real g for Gn Electron Recoil Spectra

  8. KS/P1/Ge/mn Data • Data Volume:  Total 4712/1250 hours ON/OFF • HPGe Performance:  1.06 kg mass  0.4 keV RMS @ 10 keV  5 keV detector threshold [Unique Data]  Range of O(1 cpd) [counts kg-1 day-1 keV-1] background c/f Dark Matter expt. • Analysis:  Cosmic Veto (5 ms gate)  Anti-Compton (Well+Base detectors)  Pulse Shape Disc. (veto elect. noise, accidentals) • Efficiencies Normalization: (to <0.2%)  DAQ book-keeping  Monitor random triggers  Monitor residual 40K peaks  Monitor 10 keV Ga X-rays peak

  9. Cosmic Veto, Anti-Compton & PSD Events correlated to Cosmic No signal in Anti-Compton detectors PSD : Events Selected

  10. KS/P1/Ge/mn : Results • Fit OFF spectra to p5 Measure [fOFF;dfOFF ] (@c2/dof =80/96 ) • Fit ON spectra to • fOFF +fSM + k2fMM [10-10mB] • Fit Results (@c2/dof =48/49 ): k2= -0.4  1.3 (stat.)  0.4 (sys.) Limits derived : mn < 1.3 (1.0)  10-10mB @90(68)% C.L. H.B. Li et al., TEXONO Coll., Phys. Rev. Lett. 90, 131802 (2003)

  11. Reactor mn(ne) Sensitivities Gn Sensitivities

  12. Status & Plans HPGe [1 kg] : • mn + Gn : x2 more data improved background & analysis • study ne flux from reactor • study possible nuclear transitions e.g. 73Ge* decays by 2g’s separated by t1/2=4.6 ms CsI(Tl) [186 kg] : • attempt measurement of Standard Model s(nee-)  sin2qw at MeV range Prototype ULE-HPGe [5 g] : • threshold < 300 eV • explore potentials on nN coherent scattering

  13. Reactor Neutrino Interaction Cross-Sections P2: SM (ne) > 2 MeV P1: MM (ne) 1-100 keV P3+: Coh. (nN) < 1 keV

  14. Summary • TEXONO Collaboration:  Built-Up and Growing • Kuo-Sheng Neutrino Lab.: Established & Operational ※Modular & Flexible Design Physics Data Taking since June 01 ※Unique HPGe Low Energy Data ※ Bkg Level ~ Underground CDM Expt. • Results published on mn (Gn) ※ Other analyses under way • Period-II DAQ Improved HPGe Conf. 186 kg CsI(Tl) [+ s(ne) …] • Diversified R&D Program in parallel

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