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Low Background CdWO₄ Scintillation Detector

100%

Kasperovych D., Danevich F., Kobychev V., Kropivyansky B., Tymoshenko A.

Acta Physica Polonica A

2018

vol. 133

issue 4

923-927

Low background scintillation setup has been developed that exhibits 3 orders of magnitude lower counting rate of a large volume (2.1 kg) CdWO₄ detector in the energy region 0.5-2.6 MeV, and one order of magnitude above 3 MeV. The background reduction was achieved by application of radiopure passive shield, active plastic-scintillation muon veto placed above the setup and pulse-shape discrimination. Construction of additional plastic scintillation counters is in progress to reduce the residual cosmic muons background. The setup can be applied to develop radiopure scintillators, measure radioactive contamination of materials, carry out small scale low counting experiments.

Research and Development of ZnBO_{4} (B = W, Mo) Crystal Scintillators for Dark Matter and Double Beta Decay Searching

73%

Dubovik A., Vostretsov Y. Y., Grinyov B., Danevich F., Kraus H., Nagornaya L., Mikhailik V., Tupitsyna I.

issue 1

15-19

Oxide crystal scintillators play a considerable role in fundamental and applied researches. However, working out of new generation of high-sensitivity equipment and new methods of research puts higher requirements. The ZnBO_{4} (B = W, Mo) crystals were grown from charge in platinum crucibles with high frequency heating, using the Czochralski method. The raw powder with optimum composition was prepared by solid phase high temperature synthesis using ZnO and BO_{3} (B = W, Mo) with 4-5N purity. Single crystals with sizes up to ∅ 50 × 100 mm were grown and scintillation elements of various sizes and shapes (cylinders, rectangular and hexahedron prisms) were produced. High spectrometric characteristics were obtained for ZnWO_{4}:R = 8-10% under excitation by ^{137}Cs (E_{γ}=662 keV), low radiation background (less than 0.2 mBq/kg) and low afterglow (0.002%, 20 ms after excitation). The obtained results demonstrate good prospects for ZnWO_{4} and ZnMoO_{4} crystal scintillators for application in low-count rate experiments, searching for double beta decay processes, interaction with dark matter particles, and also studies of rare decay processes. The material has also a good potential for application in modern tomography, scintillation bolometers and for other major researches using scintillators.

Radiopurity of ZnWO_4 Crystal Scintillators

45%

Belli P., Bernabei R., Cappella F., Cerulli R., Danevich F., Dubovik A., d'Angelo S., Galashov E., Grinyov B., Incicchitti A., Kobychev V., Nagornaya L., Nisi S., Nozzoli F., Poda D., Podviyanuk R., Prosperi D., Shlegel V., Tretyak V., Vasiliev Y., Vostretsov Y.

issue 1

139-142

Recently ZnWO_4 was proposed as perspective material for low-counting experiments to search for rare processes. Such experiments demand high radiopurity of ZnWO_4 crystal scintillators. With this aim radioactive contamination of large volume (0.1-0.7 kg) ZnWO_4 crystal scintillators were measured in the underground Laboratori Nazionali del Gran Sasso of the INFN at the depth of ≈ 3600 m water equivalent.

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3 Acta Physica Polonica A

1 2018

2 2010

3 Danevich F.

2 Dubovik A.

2 Grinyov B.

2 Kobychev V.

2 Nagornaya L.

1 Belli P.

1 Bernabei R.

1 Cappella F.

1 Cerulli R.

1 Galashov E.

1 Incicchitti A.

1 Kasperovych D.

1 Kraus H.

1 Kropivyansky B.

1 Mikhailik V.

1 Nisi S.

1 Nozzoli F.

1 Poda D.

1 Podviyanuk R.

1 Prosperi D.

1 Shlegel V.

1 Tretyak V.

1 Tupitsyna I.

1 Tymoshenko A.

1 Vasiliev Y.

1 Vostretsov Y.

1 Vostretsov Y. Y.

1 d'Angelo S.

Search results

Low Background CdWO₄ Scintillation Detector

Research and Development of ZnBO_{4} (B = W, Mo) Crystal Scintillators for Dark Matter and Double Beta Decay Searching

Radiopurity of ZnWO_4 Crystal Scintillators