M. Stepaniuk
A5064989516- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Radioactive Decay and Measurement Techniques
- Quantum, superfluid, helium dynamics
- Nuclear reactor physics and engineering
University of Warsaw
2019-2024
National Centre for Nuclear Research
2024
Max Planck Institute for Physics
2016-2017
Max Planck Institute for Nuclear Physics
2015-2016
Max Planck Innovation
2015
Max Planck Society
2015
A search for neutrinoless $\beta\beta$ decay processes accompanied with Majoron emission has been performed using data collected during Phase I of the GERmanium Detector Array (GERDA) experiment at Laboratori Nazionali del Gran Sasso INFN (Italy). Processes spectral indices n = 1, 2, 3, 7 were searched for. No signals found and lower limits order 10$^{23}$ yr on their half-lives derived, yielding substantially improved results compared to previous experiments $^{76}$Ge. new result half-life...
An optimized digital shaping filter has been developed for the Gerda experiment which searches neutrinoless double beta decay in $$^{76}$$ Ge. The Phase I energy calibration data have reprocessed and an average improvement of 0.3 keV resolution (FWHM) corresponding to 10 % at $$Q$$ value $$0\nu \beta $$ Ge is obtained. This possible thanks enhanced low-frequency noise rejection this Zero Area Cusp (ZAC) signal filter.
Precise determination of ground-state feeding in the $\ensuremath{\beta}$ decay fission products is an important but challenging component modeling reactor antineutrino flux and heat. The Modular Total Absorption Spectrometer (MTAS) a versatile NaI(Tl) detector array that determines true $\ensuremath{\beta}$-decay pattern free from pandemonium effect, including precise intensities. In this paper, we report MTAS results intensities $^{88}\mathrm{Rb}$ $^{88}\mathrm{Kr}$, with large cumulative...
Two neutrino double beta decay of $^{76}$Ge to excited states $^{76}$Se has been studied using data from Phase I the GERDA experiment. An array composed up 14 germanium detectors including that have isotopically enriched in was deployed liquid argon. The analysis various possible transitions final is based on coincidence events between pairs where a de-excitation $\gamma$ ray detected one detector and two electrons other. No signal observed an event counting profile likelihood used determine...
Background: An assessment done under the auspices of Organization for Economic Co-operation and Developement Nuclear Energy Agency (OECD-NEA) in 2007 suggested that $\ensuremath{\beta}$ decays many abundantly produced fission products nuclear reactors may be incomplete. In this assessment, product $^{98}\mathrm{Nb}$ was assigned highest priority study by total absorption spectroscopy due to its large cumulative branching fraction because $\ensuremath{\beta}$-decay data from several...
Internal contaminations of $^{238}$U, $^{235}$U and $^{232}$Th in the bulk high purity germanium detectors are potential backgrounds for experiments searching neutrinoless double beta decay $^{76}$Ge. The data from GERDA Phase~I have been analyzed alpha events chain these by looking full chains time correlations between successive decays same detector. No candidate a found. Upper limits on activities range few nBq/kg $^{226}$Ra, $^{227}$Ac $^{228}$Th, long-lived daughter nuclides $^{232}$Th,...
An optimized digital shaping filter has been developed for the GERDA experiment which searches neutrinoless double beta decay in 76Ge. The Phase I energy calibration data have reprocessed and an average improvement of 0.3 keV resolution (FWHM) at 76Ge Q value 0\nu\beta\beta is obtained. This possible thanks to enhanced low-frequency noise rejection this Zero Area Cusp (ZAC) signal fillter.
The $\ensuremath{\beta}$ decays of $^{87}\mathrm{Br}$, $^{88}\mathrm{Br}$, and $^{87}\mathrm{Kr}$ were measured with the Modular Total Absorption Spectrometer (MTAS) at Oak Ridge National Laboratory's Holifield Radioactive Ion Beam Facility (HRIBF). Both bromine isotopes are $\ensuremath{\beta}$-delayed neutron emitters that have large cumulative fission yields identified as top-priority cases for total absorption study by Nuclear Energy Agency in 2007. Our investigations corroborate decay...
Possibility to use Modular Total Absorption Spectrometer (MTAS) as a device measure complete decay scheme, including β -n of neutron rich isotopes, has been investigated. Analysis well known 87 Br with its 2.6% branching ratio served test case. Preliminary results agree the published data.