1. Sun Kee Kim Seoul National University
Goal of the workshop
Sun Kee Kim
Seoul National University
Workshop on Double Beta Decay Search, Seoul, Oct. 15, 2009

2. Brief History of KIMS
97 Summer : First discussion on WIMP search (cryogenic detector)
3 Kims (SK,YD,HJ)
 One day… we discussed on CsI crystal for WIMP…
 demonstrated CsI crystal can be a WIMP detector
99 Spring : Enter the underground lab. (Cheongpyung)
00 fall : DMRC funded by Creative Research Initiative Program
KIMS experiment launched
(SNU, Sejong, Yonsei, Seongkyunkwan, Ewha, Maryland)
03 fall : Yangyang Underground Lab. constructed
06 spring : 1st physics result published (PLB)  pilot run (1 crystal)
07 summer : PRL paper published  engineering run(4 crystals)
09 Now: taking data  physics run(12 crystals)
KIMS has evolved gradually starting from a small feasibility study

3. Cheongpyung, 1999

4. Colloquium presentation of SKK, May 2000

5. Colloquium presentation of SKK, May 2000
How could I make such a statement w/o funding?

7. Lesson from KIMS :
We should not wait until everything is ready (budget, technology, manpower…)
Instead, we should move ahead with whatever is available now.
However, we need to identify
the final goal of the experiment
a detailed and plausible plan for the 1st stage experiment
a sketch of path toward the final goal from the 1st stage
 Letter of Intent

8. Double Beta Decay Search with CaMoO4
Proc. New View in Particle Physics
(VIETNAM ’2004) Aug. 2004, p.449
IEEE Nucl. Sci. 52, 1131 (2005)
NIMA 584, 334 (2008)
CaMoO4
Large size and high quality crystal growing technique established
40Ca 100Mo O4 raw material for 5 kg crystal  being crystalized
Photon sensors being studies
Cryogenic detector with CMO is under development
Compton edge
FWHM ~ 5.5 MeV
241Am a
FWHM = 11.2 keV

9. First 40Ca100MoO4 crystals
after big bang
and we will have more

10. Name of the Collaboration
MoRu : 모루 = anvil
S.Olsen’s