Solotvina Underground Laboratory

Solotvina Underground Laboratory: 

Solotvina Underground Laboratory Institute for Nuclear Research (Kiev, Ukraine) http://lpd.kinr.kiev.ua

Solotvina Underground Laboratory was built up in 1984 on the west of Ukraine in Solotvina (Transcarpathian region) NaCl salt mine 430 m underground (1000 m w.e.): 

Total square  1000 m2 Solotvina Underground Laboratory was built up in 1984 on the west of Ukraine in Solotvina (Transcarpathian region) NaCl salt mine 430 m underground (1000 m w.e.)

Slide3: 

Background conditions Background of CdWO4 scintillator (44 cm) Kiev Solotvina 1000 m w.e. Solotvina in shield  flux: 1.5103 m-2·d-1 measured by plastic scintillator counter Termal n flux: 310-6 cm-2·s-1 by 3He counter Radon: 30 Bq·m-3 by radon monitor (Honeywell A 9000A 1006) Temperature is 241C independent of season

Background measured by HP Ge detector 165 cm3: 

Solotvina, 1000 m w.e. 1109 h, in shield Background measured by HP Ge detector 165 cm3 Due to low radioactive contamination of the salt, the natural  background in the SUL is 10100 times lower than in other underground laboratories Set up with HP Ge

Slide5: 

Experiment to search for 2 decay of 116Cd Kiev-Florence collaboration CdWO4 20.6 kg 116CdWO4 0.33 kg Plastic light guide Plastic active shield Copper Quartz light guide Channel for calibration

Slide6: 

Main results of 116Cd  experiment m  1.7 eV   2.510-8   2.210-6 T1/20  1.723 yr at 90 % C.L. T1/20M  0.822 yr PRC 68 (2003) 035501 gM  8.110-5 22 decay of 116Cd was observed CAMEO project was proposed  PLB 493 (2000) 216; EPJC 19 (2001) 43 Limits on 02 decay of 116Cd 100 kg of 116CdWO4 scintillators allocated in a large volume of high-pure liquid

Slide7: 

Search for 2 decay of 160Gd 2 160Gd Q2 = 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  T1/20  1.321 yr T1/22  1.919 yr at 90 % C.L.

 decay of 113Cd was investigated: 

 decay of 113Cd was investigated ½+ 0 113Cd  9/2+ 0 Q = 316 keV 113In T1/2= (7.70.3)1015 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 T1/2: (9.31.9)1015 yr [1]; (9.30.5 1)1015 yr [2] Fourth-forbidden  decay

 decay of 180W was observed: 

 decay of 180W was observed PRC 67 (2003) 014310 116CdWO4 330 g, 2975 h,  spectrum T1/2= [1.1 (stat)0.3(syst)] 1018 yr +0.8 –0.4 Recently this result was confirmed with CaWO4 as scintillator [Yu.G.Zdesenko et al., NIMA in press] and bolometer [C.Cozzini et al., PRC 70(2004)064606]

Low radioactivity technique: 

Low radioactivity technique  Sensitive methods to measure radioactive contamination of scintillators were developed Radioactive contamination of (Ca, Zn, Cd & 116Cd)WO4, GSO scintillators was measured Study of PbWO4, BGO, GSO, YAG:Nd, CaMoO4 crystal scintillators to search for rare processes is in progress nucl-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 detectors APP (2005); NIMA (2005) in press; nucl-ex/0409014, accepted to NIMA

Current status of research in Solotvina: 

Current status of research in Solotvina Advancement of the 116Cd  experiment: 3-51024 yr  m  0.3 eV Low counting experiments in collaboration with Roma 1 & 2 Universities and LNGS Modernization of the Solotvina Underground Laboratory will be realized in 2005 thanks to financing from the Ukrainian National Academy of Sciences

The Solotvina Underground Laboratory would like to participate in the ILIAS PROGRAMM: 

The Solotvina Underground Laboratory would like to participate in the ILIAS PROGRAMM