http://dspace.nbuv.gov.ua:80/handle/123456789/114727 Sun, 12 Apr 2026 01:56:41 GMT 2026-04-12T01:56:41Z http://dspace.nbuv.gov.ua:80/bitstream/id/341510/ http://dspace.nbuv.gov.ua:80/handle/123456789/114727 http://dspace.nbuv.gov.ua:80/handle/123456789/119310 Engineering of long length CsI:Tl scintillators for high energy physics Zosim, D.I.; Gektin, A.V. It is shown that engineering of long length CsI:Tl scintillators for medium and high energy physics projects significantly depends of the primary performance of scintillation single crystal. In particular statistical study on several hundred samples for different project justify significant role of the Tl concentration. Tl concentration gradient along the bar and final finishing (stability of surface roughness for the light collection tuning) in the technology optimization for scintillator production. It is necessary to note, that any of these parameters are not taken into account in the Monte Carlo simulation (Geant 4) that usually use as the start point for the scintillator optimization. Thu, 01 Jan 2015 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/119310 2015-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/119309 Search for 2β processes in ¹⁰⁶Cd with ¹⁰⁶CdWO₄ crystal scintillator Polischuk, O.G.; Belli, P.; Bernabei, R.; Brudanin, V.B.; Cappella, F.; Caracciolo, V.; Cerulli, R.; Chernyak, D.M.; Danevich, F.A.; D'Angelo, S.; Incicchitti, A.I; Laubenstein, M.; Mokina, V.M.; Poda, D.V.; Tretyak, V.I.; Tupitsyna, I.A. An experiment to search for double β (2β) decay of ¹⁰⁶Cd with the help of a low-background cadmium tungstate crystal scintillator developed from cadmium enriched in ¹⁰⁶Cd to 66 % (106CdWO4, 215 g) is in progress at the STELLA facility of the Gran Sasso underground laboratory (INFN, Italy). The ¹⁰⁶CdWO₄ scintillator is viewed by low-background photomultiplier through a PbWO₄ crystal light-guide produced from deeply purified archaeological lead. The detector operates in coincidence with the four low-background HPGe detectors to search for 2β processes with the emission of gamma quanta. Sensitivity of the experiment after 10678 h of data taking to different channels of 2β decay of ¹⁰⁶Cd is on the level of limT₁/₂ ~ 10¹⁹-10²¹ years. Thu, 01 Jan 2015 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/119309 2015-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/119308 Research of long GSO and LYSO crystals used in the calorimeter developed for the COMET experiment Kalinnikov, V.; Velicheva, E. Experimental tests have been performed in order to study loss of the light output in length and to improve light collection of photons for long GSO and LYSO crystals. Research of shower development in crystals with non-optimal geometry and losses of light energy in light-reflecting wrapping were performed with the use of SLitrani and Geant4 codes. Obtained results allowed developing the structure of a calorimeter producing the required energy and energy-correlated resolutions in the COMET experiment. Thu, 01 Jan 2015 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/119308 2015-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/119307 Research of the ECAL calorimeter used in the COMET experiment Kalinnikov, V.; Velicheva, E. Based on the real optical model received with the Geant4 simulation, the optimal structure and geometry of the COMET calorimeter was developed, the influence of the shower was studied and energy deposition and calorimeter energy resolution (equal to 4.8 % for the LYSO crystal calorimeter and 6.0 % for the GSO crystal calorimeter) was defined. There was suggested and experimentally tested the algorithm of spatial reconstruction of events in the calorimeter allowing to improve the determination accuracy of the energy deposition value in 2.8 times. Thu, 01 Jan 2015 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/119307 2015-01-01T00:00:00Z