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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.).

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solotvina underground laboratory
Solotvina Underground Laboratory

Institute for Nuclear Research (Kiev, Ukraine)

http://lpd.kinr.kiev.ua

slide2

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

Total square  1000 m2

slide3

Background conditions

 flux: 1.5103 m-2·d-1measured by plastic scintillator counter

Termal nflux: 310-6 cm-2·s-1by 3He counter

Radon:30Bq·m-3 by radon monitor (Honeywell A9000A 1006)

Temperature is 241C independent of season

Background of CdWO4 scintillator (44 cm)

Kiev

Solotvina

1000 m w.e.

Solotvina

in shield

background measured by hp ge detector 165 cm 3
Background measured by HP Ge detector 165 cm3

Set up with HP Ge

Solotvina, 1000 m w.e.

1109 h, in shield

Due to low radioactive contamination of the salt, the natural  background in the SUL is 10100 times lower than in other underground laboratories

slide5

Experiment to search for 2 decay of 116CdKiev-Florence collaboration

Plastic active shield

CdWO4

20.6 kg

Copper

116CdWO4

0.33 kg

Plastic light guide

Quartz

light guide

Channel for calibration

slide6

Main results of116Cd  experiment

22 decay of 116Cd was observed

Limits on 02 decay of 116Cd

T1/20  1.723 yr

at 90 % C.L.

m 1.7 eV

 2.510-8

 2.210-6

T1/20M 0.822 yr

gM  8.110-5

CAMEO project

was proposed

PRC 68 (2003) 035501

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

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

slide7

Search for 2 decay of 160Gd

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

2160GdQ2 = 1730 keV

T1/20  1.321 yr

T1/22  1.919 yr

at 90 % C.L.

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

decay of 113 cd was investigated
decay of 113Cd was investigated

CdWO4 454 g, 433 h

½+ 0

113Cd 

9/2+ 0

Q = 316 keV113In

Fourth-forbidden  decay

T1/2= (7.70.3)1015 yr [ Yad. Fis. 59(1995)5 ]

Previous T1/2:(9.31.9)1015 yr [1]; (9.30.5 1)1015 yr [2]

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

decay of 180 w was observed
 decay of 180W was observed

116CdWO4 330 g, 2975 h,  spectrum

+0.8

–0.4

T1/2= [1.1 (stat)0.3(syst)]1018 yr

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]

PRC 67 (2003) 014310

low radioactivity technique
Low radioactivity technique

Sensitive methods to measure radioactive contamination of scintillators were developed

  • Radioactive contamination of (Ca, Zn, Cd &116Cd)WO4,GSOscintillators was measured
  • CaWO4andZnWO4were studied as detectors to search for 2 decay processes in48Caand64Zn,and as dark matter detectors
  • APP (2005); NIMA (2005) in press; nucl-ex/0409014, accepted to NIMA
  • Study ofPbWO4, BGO, GSO,YAG:Nd, CaMoO4crystal scintillatorsto search for rare processes is in progress
  • nucl-ex/0412021; nucl-ex/0410021, accepted to NIM A
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