Solotvina Underground LaboratorySolotvina Underground Laboratory

Institute for Nuclear Research Institute for Nuclear Research (Kiev, Ukraine)(Kiev, Ukraine)

http://lpd.kinr.kiev.ua

Total square Total square 1000 m 1000 m22

Solotvina Underground Laboratory was built upSolotvina Underground Laboratory was built up in 1984 on the in 1984 on the west of Ukraine in Solotvina west of Ukraine in Solotvina

(Transcarpathian region)(Transcarpathian region) NaCl salt mine 430 m underground (salt mine 430 m underground (1000 m w.e.)1000 m w.e.)

Background conditions

Background of CdWO4 scintillator (44 cm)

Kiev

Solotvina

1000 m w.e.

Solotvina

in shield

flux: 1.5103 m-2·d-1 measured by plastic scintillator counter

Termal nn flux: 310-6 cm-2·s-1 by 3He counterRadonRadon: 30 Bq·m-3 by radon monitor

(Honeywell A 9000A 1006)

Temperature is 241C independent of season

Solotvina, 1000 m w.e.1109 h, in shield

Background measured by HP Ge detector 165 cmBackground measured by HP Ge detector 165 cm33

Due to low radioactive contamination of the salt, the natural background in the SUL is 10100 times lower than in other underground laboratories

Set up with HP Ge

Experiment to search for 2Experiment to search for 2 decay of decay of 116116CdCdKiev-Florence collaborationKiev-Florence collaboration

CdWO420.6 kg116CdWO40.33 kg

Plastic light guide

Plastic active shield

Copper

Quartzlight guide Channel for

calibration

Main results ofMain results of 116116Cd Cd experiment experiment

mm   1.7 eV 1.7 eV    2.52.51010-8-8

    2.22.21010-6-6

TT1/21/200 1.7 1.72323 yr yr

at 90 % C.L.at 90 % C.L.

TT1/21/200MM   0.8 0.82222 yr yr

PRC 68 (2003) 035501

ggMM   8.1 8.11010-5-5

22 decay of 116Cd was observed

CAMEO project CAMEO project was proposedwas proposed

PLB 493 (2000) 216; EPJC 19 (2001) 43

Limits on 02 decay of 116Cd

100 kg of 116CdWO4 scintillators allocated in a large volume of high-pure

liquid

Search for 2Search for 2 decay of decay of 160160GdGd

2 160GdQ2 = 1730 keV

Yad. Fiz. 58 (1995) 195; NPA 694 (2001) 375

was performed with the help of Gd2SiO5(Ce) crystal scintillator, 635 g, 13 949 h

TT1/21/2

00 1.3 1.32121 yr yr

TT1/21/222 1.9 1.91919 yr yr

at 90 % C.L.at 90 % C.L.

decay of 113Cd was investigated

½+ 0 113Cd

9/2+ 0

Q = 316 keV 113In

TT1/21/2= (7.7= (7.70.3)0.3)10101515 yr yr [ [ Yad. Fis.

59(1995)5 ]

[1] J.Inorg.Nucl.Chem. 32(1970)2113; [2] NPB (Proc.Suppl.) 35(1994)394

CdWO4 454 g, 433 h

Previous TPrevious T1/21/2:: (9.3(9.31.9)1.9)10101515 yr [1]; (9.3 yr [1]; (9.30.5 0.5 1)1)10101515 yr yr

[2] [2]

Fourth-forbidden decay

decay of decay of 180180W W was observedwas observed

PRC 67 (2003) 014310

116116CdWOCdWO44 330 g, 2975 h, 330 g, 2975 h, spectrumspectrum

TT1/21/2= [1.1 (stat)= [1.1 (stat)0.3(syst)]0.3(syst)] 10101818 yr yr +0.8+0.8

––0.40.4

Recently this result was confirmed with CaWORecently this result was confirmed with CaWO44 as scintillator as scintillator [Yu.G.Zdesenko et [Yu.G.Zdesenko et al., NIMA in press] and bolometer [C.Cozzini et al., PRC 70(2004)064606]al., NIMA in press] and bolometer [C.Cozzini et al., PRC 70(2004)064606]

Low radioactivity techniqueLow radioactivity technique Sensitive methods to measure radioactive contamination of scintillators were developed

Radioactive contamination of (Radioactive contamination of (CaCa, , ZnZn, , Cd Cd && 116116CdCd))WOWO44,, GSOGSO scintillators was measuredscintillators was measured

Study of PbWOPbWO44, , BGOBGO, , GSOGSO,, YAG:NdYAG:Nd, , CaMoOCaMoO44 ccrystal rystal

scscintillatorsintillators to search for rare processes is in progressnucl-ex/0412021; nucl-ex/0410021, accepted to NIM A

CaWO4 and ZnWO4 were studied as detectors to search for 2 decay processes in 48Ca and 64Zn, and as dark matter detectorsAPP (2005); NIMA (2005) in press; nucl-ex/0409014, accepted to NIMA

Current status of research in SolotvinaCurrent status of research in Solotvina

Advancement of the Advancement of the 116116Cd Cd experiment:experiment:3-53-510102424 yr yr mm   0.3 eV 0.3 eV

Low counting experiments in collaboration with Low counting experiments in collaboration with Roma 1Roma 1 & & 22 Universities and Universities and LNGSLNGS

Modernization of the Solotvina Underground Laboratory Modernization of the Solotvina Underground Laboratory will be realized in 2005 thanks to will be realized in 2005 thanks to

financing from the Ukrainian National Academy of Sciencesfinancing from the Ukrainian National Academy of Sciences

The Solotvina Underground Laboratory would like to participate in the ILIAS

PROGRAMM