Status overview of AMORE or Amore Sun Kee

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) 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) 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) 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) Tsinghua University : Y. Li, Q. Yue(2) 4 countries 8 institutions 67 collaborators

2009. 10. 15 -10. 17 1 st workshop – Collaboration formed Steering committee : S. K. Kim, Y. D. Kim, H. J. Kim, Y. H. Kim, V. Kornoukhov, F. Danevich 2010. 3. 16 : Collaboration name AMORE was decided 2010. 5. 7 : AMORE software workshop 2010. 7 : 2 nd workshop Need a contest for logo of AMORE? INDICO Documents archive for AMORE http: //q 2 c. snu. ac. kr/indico/category. Display. py? categ. Id=16 Presentation files for 1 st workshop http: //q 2 c. snu. ac. kr/indico/conference. Display. py? conf. Id=11

Neutrinoless Double Beta Decay Energy 100 Tc 100 Mo Q Forbidden transition Transition bb allowed 100 Ru bb Z Z Z+1 Z+2 100 me. V 25 me. V 2 me. V need 1 ton detector S 13

Cryogenic detector R&D FWHM = 11. 2 ke. V 241 Am FWHM = 1. 8 ke. V Emission line of Mo : 18 ke. V 5 5

Cryogenic Ca. Mo. O 4 Sensitivity • 0. 5% FWHM 15 ke. V FWHM for low temp. • 5 years, 100 kg 40 Ca 100 Mo. O 4 : T 1/2 = 7. 0 x 1026 years <m> = 20 – 70 me. V Dark matter search High sensitivity Ca. Mo. O 4 Eth=10 ke. V (5 and 100 kg year) Hirsch et al, PLB 679: 454 -459, 2009 Fully covers inverted hierarchy XENON 100 6000 kgd Ca. Mo. O 4 Eth=1 ke. V (5 and 100 kg year) Super. CDMS 25 kg

40 Ca 100 Mo. O 4 1) SB 28 40 Ca 100 Mo. O 4 crystal. It was grown 09. 2009. 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) SB 29 40 Ca 100 Mo. O 4 crystal. It was grown 11. 09. 2009. 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.

New 40 Ca 100 Mo. O 4 crystal from Russia SB 35 D 44 mm x L 51 mm ~ 300 g SB 28 CMO-3

Light output of SB 35 SB 28 Resolution : 30% (FWHM) Mean : 2. 88 x 105 SB 35 Resolution : 16% (FWHM) Mean : 5. 97 x 105 CMO_3 Resolution : 16% (FWHM) Mean : 6. 79 x 105

1 st stage experiment (pilot experiment) 0. 5 -5 kg CMO crystal Decisions on - Size/shape of each crystal - Light guide (? ) - Operating temperature - Photon sensor (? ) - Digitizer/ DAQ Separate shielding or KIMS shielding

detector Plastic scintillator light-guide Liquid scintillator Ca. Mo. O 4 Cs. I(Tl) Cu 10 -15 cm, Pb 20 -25 cm, Cd 1 -2 mm Polyethylene 20 -30 cm N 2 flux to remove air (Rn) F. A. Danevich Workshop on Double Beta Decay Search, SNU 16 Oct 2009 11

Detector installation - Ruslan Teflon wrapping Mineral Oil 12

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

Experimental setup at Y 2 L • PMTs & Cs. I crystals are crossly connected. • Lead shielding(10 cm) • Cs. I detectors surround the Ca. Mo. O 4 crystal • 511 ke. V signal is a opposite direction for momentum conservation. (back to back cut) • Ca. Mo. O 4 is surrounded by 14 Cs. I crystals & 14 PMTs. Add more PMTs soon Cs. I Ca. Mo. O 4 – 6. 5 x 5. 5 x 30 cm(12) – 9 x 9 x 6 cm(#13 & #14) - 2. 2 x 6 cm (2) - 255 g

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 5 kg 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

Yang Underground Laboratory(Y 2 L) (Upper Dam) Y 2 L • 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 (~2 km) Experiments: • KIMS: DM search exp. in operation • AMORE: DBD Search exp. in preparation (additional laboratory space in design) (Power Plant) (Lower Dam)