R. Saakyan
A5107117356- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Nuclear physics research studies
- Radioactive Decay and Measurement Techniques
- Radioactive contamination and transfer
- Radioactivity and Radon Measurements
- Muon and positron interactions and applications
- Plasma Diagnostics and Applications
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Photocathodes and Microchannel Plates
- Advanced Radiotherapy Techniques
- Particle accelerators and beam dynamics
- Advanced Optical Sensing Technologies
- Nuclear reactor physics and engineering
- Advanced NMR Techniques and Applications
- Quantum Chromodynamics and Particle Interactions
- Scientific Research and Discoveries
- Chemical and Physical Properties of Materials
- CCD and CMOS Imaging Sensors
University College London
2015-2024
Dubna State University
2017
Laboratoire de Physique des deux infinis Bordeaux
2017
Institut National de Physique Nucléaire et de Physique des Particules
2017
Université de Bordeaux
2017
Centre National de la Recherche Scientifique
2017
Fermi National Accelerator Laboratory
2002
Institute for Theoretical and Experimental Physics
1994-2002
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
1998-1999
The NEMO 3 detector, which has been operating in the Fréjus underground laboratory since February 2003, is devoted to search for neutrinoless double-beta decay (beta beta 0v). half-lives of two neutrino 2v) have measured 100Mo and 82Se. After 389 effective days data collection from 2003 until September 2004 (phase I), no evidence was found approximately 7 kg 1 corresponding limits are T1/2(beta beta0v) > 4.6 x 10(23) yr 0v) 1.0 82Se (90% C.L.). Depending on nuclear matrix element...
The possibility to probe new physics scenarios of light Majorana neutrino exchange and right-handed currents at the planned next generation neutrinoless double beta decay experiment SuperNEMO is discussed. Its ability study different isotopes track outgoing electrons provides means discriminate underlying mechanisms for by measuring half-life electron angular energy distributions.
Observing double beta decay with no neutrinos in the final state, would signal existence of lepton number violating processes and hint at neutrino being a Majorana particle. The impressive effort represented by NEMO-3 experiment sets important constraints on mass lepton-number processes.
Two-neutrino double-β decay is a radioactive process with the longest lifetime ever observed. It has been subject of experimental research for more than 60 years and remains an important topic in modern nuclear particle physics. This review examines detail, covers its theoretical aspects, describes results obtained so far future challenges.
The half-life for double-$\ensuremath{\beta}$ decay of $^{150}\mathrm{Nd}$ has been measured by the NEMO-3 experiment at Modane Underground Laboratory. Using 924.7 days data recorded with $36.55$ g $^{150}\mathrm{Nd}$, we $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ to be ${T}_{1/2}^{2\ensuremath{\nu}}=(9.{11}_{\ensuremath{-}0.22}^{+0.25}(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.63(\mathrm{syst}.))\ifmmode\times\else\texttimes\fi{}{10}^{18}$ yr. observed limit on neutrinoless...
The NEMO-3 experiment at the Modane Underground Laboratory has investigated double-$\beta$ decay of $^{48}{\rm Ca}$. Using $5.25$ yr data recorded with a $6.99\,{\rm g}$ sample Ca}$, approximately $150$ candidate events have been selected signal-to-background ratio greater than $3$. half-life for two-neutrino Ca}$ measured to be $T^{2\nu}_{1/2}\,=\,[6.4\, ^{+0.7}_{-0.6}{\rm (stat.)} \, ^{+1.2}_{-0.9}{\rm (syst.)}] \times 10^{19}\,{\rm yr}$. A search neutrinoless yields null result and...
The NEMO-3 collaboration reports the half-life of ${}^{150}$Nd via two-neutrino double-beta decay mode to an unprecedented accuracy. For zero-neutrino ${}^{150}$Nd, distinctive signature possible Majorana nature neutrinos, no observations but sets new upper bounds for in various scenarios beyond standard model.
The full data set of the NEMO-3 experiment has been used to measure half-life two-neutrino double beta decay $$^{100}$$ Mo ground state Ru, $$T_{1/2} = \left[ 6.81 \pm 0.01\,\left( \text{ stat }\right) ^{+0.38}_{-0.40}\,\left( syst \right] \times 10^{18}$$ year. two-electron energy sum, single electron spectra and distribution angle between electrons are presented with an unprecedented statistics $$5\times 10^5$$ events a signal-to-background ratio $$\sim $$ 80. Clear evidence for Single...
We report results from the NEMO-3 experiment based on an exposure of 1275 days with 661 g (130)Te in form enriched and natural tellurium foils. The ββ decay rate is found to be greater than zero a significance 7.7 standard deviations half-life measured T(½)(2ν) = [7.0 ± 0.9(stat) 1.1(syst)] × 10(20) yr. This represents most precise measurement this yet published first real-time observation decay.
We report the results of a search for neutrinoless double-$\ensuremath{\beta}$ decay ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) $^{100}\mathrm{Mo}$, using NEMO-3 detector to reconstruct full topology final state events. With an exposure $34.7\text{ }\text{ }\mathrm{kg}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{y}$, no evidence $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ signal has been found, yielding limit light Majorana neutrino mass mechanism...
Using data from the NEMO-3 experiment, we have measured two-neutrino double beta decay ( $$2\nu \beta $$ ) half-life of $$^{82}$$ Se as $$T_{\smash {1/2}}^{2\nu } \!=\! \left[ 9.39 \pm 0.17\left( \text{ stat }\right) 0.58\left( syst \right] \times 10^{19}$$ y under single-state dominance hypothesis for this nuclear transition. The corresponding matrix element is $$\left| M^{2\nu }\right| = 0.0498 0.0016$$ . In addition, a search neutrinoless $$0\nu using 0.93 kg observed total 5.25 has been...
We examine a macroscopic system in quantum superposition of two spatially separated localized states as detector for stream weakly interacting relativistic particles. do this using the explicit example neutrinos with $\mathrm{MeV}$-scale energy scattering from solid object via neutral-current neutrino-nucleus scattering. Presuming (anti)neutrino source to be nuclear fission reactor, we utilize estimated flux and coherent elastic cross section constrain spatial separation...
The NEMO-3 experiment measured the half-life of $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay and searched for $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ $^{116}\mathrm{Cd}$. Using 410 g $^{116}\mathrm{Cd}$ installed in detector with an exposure 5.26 y, ($4968\ifmmode\pm\else\textpm\fi{}74$) events corresponding to ground state $^{116}\mathrm{Sn}$ have been observed a signal background ratio about 12. has be...
The performance of Hamamatsu 8" photomultiplier tubes (PMTs) the type used in SuperNEMO neutrinoless double-beta decay experiment (R5912-MOD), is investigated as a function exposure to helium (He) gas. Two PMTs were monitored for over year, one exposed varying concentrations He, and other kept standard atmospheric conditions control. Both light signals generated by Bi-207 radioactive source that provided consistent large input PMT similar those are typical experiment. energy resolution...
Abstract Next generation tritium decay experiments to determine the absolute neutrino mass require high-precision measurements of β-decay electron energies close kinematic end point. To achieve this, development high phase-space density sources atomic is required, along with implementation methods control motion these atoms allow extended observation times. A promising approach efficiently and accurately measure kinetic individual electrons generated in dilute gases, frequency cyclotron...
SuperNEMO is a double-$\beta$ decay experiment, which will employ the successful tracker-calorimeter technique used in recently completed NEMO-3 experiment. implement 100 kg of isotope, reaching sensitivity to neutrinoless ($0\nu\beta\beta$) half-life order $10^{26}$ yr, corresponding Majorana neutrino mass 50-100 meV. One main goals and challenges detector development programme has been reach calorimeter energy resolution, $\Delta$E/E, around 3%/$sqrt(E)$(MeV) $\sigma$, or 7%/$sqrt(E)$(MeV)...