Status overview of AMORE (or Amore) Sun Kee Kim Seoul National University 2 nd International Workshop on Double Beta Decay Search, Seoul, Oct. 7, 2010.

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Presentation transcript:

Status overview of AMORE (or Amore) Sun Kee Kim Seoul National University 2 nd International Workshop on Double Beta Decay Search, Seoul, Oct. 7, 2010

Amore Collaboration Korea (35) Korea (35) Seoul National University : H.Bhang, S.Choi, M.J.Kim, S.K.Kim, M.J.Lee, S.S.Myung, S.Olsen, Y. Sato, K.Tanida, S.C.Kim, J.Choi, H.S.Lee, S.J.Lee, J.H.Lee, J.K.Lee, X.Li, J.Li, H.Kang, H.K.Kang, Y.Oh, S.J.Kim, E.H.Kim, K.Tshoo, D.K.Kim(24) Sejong University : Y.D.Kim, E.-J.Jeon, K. Ma, J.I.Lee, W.Kang, J.Hwa (5) Kyungpook national University : H.J.Kim, J.So, Gul Rooh, Y.S.Hwang(4) KRISS : Y.H.Kim, M.K.Lee, H.S.Park, J.H.Kim, J.M.Lee (5) Russia (16) Russia (16) ITEP(Institute for Theoretical and Experimental Physics) : V.Kornoukhov, P. Ploz, N.Khanbekov (3) Baksan National Observatory : A.Ganggapshev, A.Gezhaev, V.Gurentsov, V.Kuzminov, V.Kazalov, O.Mineev, S.Panasenko, S.Ratkevich, A.Verensnikova, S.Yakimenko, N.Yershov, K.Efendiev, Y.Gabriljuk (13) Ukraine(11) Ukraine(11) INR(Institute for Nuclear Research) : F.Danevich, V.Tretyak, V.Kobychev, A.Nikolaiko, D.Poda, R.Boiko, R.Podviianiuk, S.Nagorny, O.Polischuk, V.Kudovbenko, D.Chernyak(11) China(2) China(2) Tsinghua University : Y.Li, Q.Yue(2) 4 countries 8 institutions 67 collaborators

st workshop – Collaboration formed Steering committee : S.K.Kim, Y.D.Kim, H.J.Kim, Y.H.Kim, V. Kornoukhov, F. Danevich : Collaboration name AMORE was decided : AMORE software workshop : 2 nd workshop INDICO Documents archive for AMORE Presentation files for 1 st workshop Need a contest for logo of AMORE?

Neutrinoless Double Beta Decay S meV 25 meV 2meV need 1 ton detector Transition  allowed Forbidden  transition Z Energy Z Z+1Z+2 Q  100 Mo 100 Ru 100 Tc

Cryogenic detector R&D FWHM = 11.2 keV 5 FWHM = 1.8 keV Emission line of Mo : 18 keV Am

Cryogenic CaMoO4 Sensitivity 0.5% FWHM  15 keV FWHM for low temp. 5 years, 100 kg 40 Ca 100 MoO 4 : T 1/2 = 7.0x10 26 years  = 20 – 70 meV Fully covers inverted hierarchy CaMoO4 E th =10 keV (5 and 100 kg year) CaMoO4 E th =1 keV (5 and 100 kg year) XENON kgd SuperCDMS 25kg Hirsch et al, PLB679: ,2009 Dark matter search  High sensitivity

1) SB28 40Ca100MoO4 crystal. It was grown H = 25,5 mm, Dmax = 49,5 mm Dmin = 40,5 mm Mass = 195,94 gr. Annealing procedure into oxygen atmosphere = 312 hours. Colourless. There is weak blueness along small diameter of the ellipse. The end face of the crystal was polished to optical grade quality. Note. To accelerate annealing procedure, the cylinder side of the crystal was grinded with the sand paper 600/800 grade. 2) SB29 40Ca100MoO4 crystal. It was grown H = 48/51 mm, Dmax = 50,0 mm Dmin = 42,5 mm Mass = 390,35 gr. Annealing procedure into oxygen atmosphere = 240 hours. Colourless. There is weak blueness along small diameter of the ellipse. The end face of the crystal was polished to optical grade quality. Note. No grinding of the cylinder side of the crystal was done. 40 Ca 100 MoO 4

New 40 Ca 100 MoO 4 crystal from Russia SB35SB28 CMO-3 D44 mm x L51 mm ~ 300g

Light output of SB35 SB35 Resolution : 16% (FWHM) Mean : 5.97 x 10 5 CMO_3 Resolution : 16% (FWHM) Mean : 6.79 x 10 5 SB28 Resolution : 30% (FWHM) Mean : 2.88 x 10 5

1 st stage experiment (pilot experiment) 0.5-5kg CMO crystal Decisions on - Size/shape of each crystal - Light guide (?) - Operating temperature - Photon sensor (?) - Digitizer/ DAQ Separate shielding or KIMS shielding

11 detector CsI(Tl) CaMoO 4 Liquid scintillator Plastic scintillator light-guide Cu cm, Pb cm, Cd 1-2 mm Polyethylene cm N 2 flux to remove air (Rn) F.A. Danevich Workshop on Double Beta Decay Search, SNU16 Oct 2009

12 Detector installation - Ruslan Mineral Oil Teflon wrapping

13 QC Height NC qc sum height sum nc sum Resolution of 137Cs – No Merged && 20mV THR_- JHChoi Ruslan’s Result

Experimental setup at Y2L CsI detectors surround the CaMoO4 crystal 511keV signal is a opposite direction for momentum conservation. (back to back cut) CaMoO4 is surrounded by 14 CsI crystals & 14 PMTs. CsI CaMoO4 –6.5x5.5x30cm (12) - 2.2x2.2x6cm (2) –9x9x6cm(#13 & #14) - 255g PMTs & CsI crystals are crossly connected. Lead shielding(10 cm) Add more PMTs soon

1 st stage experiment (up to ~5 kg ?) -- should be carried out within the currently available budget. WCU, Basic science grants ISTC, Korea-Ukraine Cooperation fund  Intermediate step could be 5kg Cryogenic detector (maybe possible w/o additional funding)  100 kg Cryogenic detector  We should aim for it will need new budget funding opportunity exists!

CANBERRA HPGe

National Facility Road Map (NFRM) Included in a list of 71 out of 282 proposals

Y2L Located in a tunnel of Yangyang Pumped Storage Power Plant Korea Middleland Power Co. Minimum vertical depth : 700 m Access to the lab by car (~2km) Experiments: KIMS: DM search exp. in operation AMORE: DBD Search exp. in preparation (additional laboratory space in design) YangYang Underground Laboratory(Y2L) (Upper Dam) (Lower Dam) (Power Plant)