O. Chkvorets
A5040959484- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Nuclear Physics and Applications
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Nuclear physics research studies
- Radioactive contamination and transfer
- Medical Imaging Techniques and Applications
- Muon and positron interactions and applications
- Scientific Research and Discoveries
- Atomic and Subatomic Physics Research
Max Planck Institute for Nuclear Physics
2003-2023
Laurentian University
2008-2022
Snolab
2011
Queen's University
2011
Max Planck Society
2003-2008
SNO+ is a large liquid scintillator-based experiment located 2km underground at SNOLAB, Sudbury, Canada. It reuses the Sudbury Neutrino Observatory detector, consisting of 12m diameter acrylic vessel which will be filled with about 780 tonnes ultra-pure scintillator. Designed as multipurpose neutrino experiment, primary goal search for neutrinoless double-beta decay (0$\nu\beta\beta$) 130Te. In Phase I, detector loaded 0.3% natural tellurium, corresponding to nearly 800 kg 130Te, an expected...
The Gerda collaboration is performing a search for neutrinoless double beta decay of 76Ge with the eponymous detector. experiment has been installed and commissioned at Laboratori Nazionali del Gran Sasso started operation in November 2011. design, construction first operational results are described, along detailed information from R&D phase.
The SNO+ experiment is located 2 km underground at SNOLAB in Sudbury, Canada. A low background search for neutrinoless double beta (0νββ) decay will be conducted using 780 tonnes of liquid scintillator loaded with 3.9 natural tellurium, corresponding to 1.3 130Te. This paper provides a general overview the experiment, including detector design, construction process plants, commissioning efforts, electronics upgrades, data acquisition systems, and calibration techniques. collaboration reusing...
First studies of event discrimination with a Broad-Energy Germanium (BEGe) detector are presented. A novel pulse shape method, exploiting the characteristic electrical field distribution inside BEGe detectors, allows to identify efficiently single-site events and reject multi-site events. The first typical for neutrinoless double beta decays (0νββ) latter backgrounds from gamma-ray interactions. obtained survival probabilities at energies close Qββ(76Ge) = 2039 keV (0.93 ± 0.08)% 60Co, (21...
A measurement of the $^{8}\mathrm{B}$ solar neutrino flux has been made using a 69.2 kt-day dataset acquired with $\mathrm{SNO}+$ detector during its water commissioning phase. At energies above 6 MeV is an extremely pure sample elastic scattering events, owing primarily to detector's deep location, allowing accurate relatively little exposure. In that energy region best fit background rate $0.2{5}_{\ensuremath{-}0.07}^{+0.09}\text{ }\text{...
This paper reports results from a search for nucleon decay through invisible modes, where no visible energy is directly deposited during the itself, initial water phase of $\mathrm{SNO}+$. However, such decays within oxygen nucleus would produce an excited daughter that subsequently deexcite, often emitting detectable gamma rays. A rays yields limits $2.5\ifmmode\times\else\texttimes\fi{}{10}^{29}\text{ }\text{ }\mathrm{y}$ at 90% Bayesian credibility level (with prior uniform in rate)...
We describe the R and D on scintillator purification assay methods technology for SNO+ neutrino double-beta decay experiment. The experiment is a replacement of SNO heavy water with liquid comprised 2 g/L PPO in linear alkylbenzene (LAB). During filling LAB will be transported underground by rail car purified multi-stage distillation steam stripping at flow rate 19 LPM. While detector operational can recirculated 150 LPM (full volume 4 days) to provide repurification as necessary either...
This paper reports results from a search for single and multi-nucleon disappearance the $^{16}$O nucleus in water within \snoplus{} detector using all of available data. These so-called "invisible" decays do not directly deposit energy but are instead detected through their subsequent nuclear de-excitation gamma-ray emission. New limits given partial lifetimes: $\tau(n\rightarrow inv) > 9.0\times10^{29}$ years, $\tau(p\rightarrow 9.6\times10^{29}$ $\tau(nn\rightarrow 1.5\times10^{28}$...
The $\mathrm{SNO}+$ experiment collected data as a low-threshold water Cherenkov detector from September 2017 to July 2019. Measurements of the 2.2-MeV $\ensuremath{\gamma}$'s produced by neutron capture on hydrogen were made using an Am-Be calibration source, for which large fraction emitted neutrons are simultaneously with 4.4-MeV $\ensuremath{\gamma}$. Analysis delayed coincidence between $\ensuremath{\gamma}$ and revealed detection efficiency that is centered around 50% varies at level...
SNO+ is a large-scale liquid scintillator experiment with the primary goal of searching for neutrinoless double beta decay, and located approximately 2 km underground in SNOLAB, Sudbury, Canada. The detector acquired data two years as pure water Cherenkov detector, starting May 2017. During this period, optical properties were measured situ using deployed light diffusing sphere, improving model energy response systematic uncertainties. parameters included attenuation coefficients, effective...
Abstract A liquid scintillator consisting of linear alkylbenzene as the solvent and 2,5-diphenyloxazole fluor was developed for SNO+ experiment. This mixture chosen it is compatible with acrylic has a competitive light yield to pre-existing scintillators while conferring other advantages including longer attenuation lengths, superior safety characteristics, chemical simplicity, ease handling, logistical availability. Its properties have been extensively characterized are presented here. now...
To reduce background in experiments looking for rare events, such as the GERDA double beta decay experiment, it is necessary to employ active background-suppression techniques. One of techniques pulse shape analysis signals induced by interaction radiation with detector. Analysis time-development impulses can distinguish between an electron and a multiple-scattered photon inside This information be used eliminate events from recorded data. Results pulse-shape commercially available...
To reduce background in experiments looking for rare events, such as the GERDA double beta decay experiment, it is necessary to employ active background-suppression techniques. One of techniques pulse shape analysis signals induced by interaction radiation with detector. Analysis time-development impulses can distinguish between an electron and a multiple-scattered photon inside This information be used eliminate events from recorded data. Results pulse-shape commercially available...