A5029997130- Neutrino Physics Research
- Nuclear physics research studies
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Particle accelerators and beam dynamics
- Advanced NMR Techniques and Applications
- Muon and positron interactions and applications
- Quantum, superfluid, helium dynamics
- Radioactive Decay and Measurement Techniques
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Scientific Research and Discoveries
- Molecular Spectroscopy and Structure
- Astronomical and nuclear sciences
- Particle Detector Development and Performance
- Quantum chaos and dynamical systems
- Nuclear reactor physics and engineering
- Medical Imaging Techniques and Applications
- Quantum and Classical Electrodynamics
- Cold Atom Physics and Bose-Einstein Condensates
University of Jyväskylä
2016-2025
Institutul National de Cercetare si Dezvoltare pentru Fizica Pamantului
2024
Centre of Advanced Studies
2024
Osaka University
2022
The University of Texas at Austin
2020
TU Dresden
2017-2020
University College London
2016
Academy of Romanian Scientists
2015
Czech Academy of Sciences, Institute of Physics
2015
University of Manchester
2014
We compute the nuclear matrix elements (NMEs) corresponding to neutrinoless double beta ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) decays of nuclei which attract current experimental interest. concentrate on ground-state-to-ground-state decay transitions mediated by light (l-NMEs) or heavy (h-NMEs) Majorana neutrinos. The computations are done in realistic single-particle model spaces using proton-neutron quasiparticle random-phase approximation (pnQRPA) with two-nucleon...
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...
A self-consistent method of treating excitations the proton-neutron quasiparticle random-phase approximation is presented. The non-self-consistent methods violate Pauli exclusion principle and lead to an eventual collapse ground state. This behavior renders a reliable calculation nuclear matrix elements, relevant for prediction double-beta-decay half-lives, difficult. present formalism promotes avoids elements. We have applied this double beta decay ${}^{100}$Mo.
Penning trap measurements using mixed beams of 76Ge–76Se and 100Mo–100Ru have been utilized to determine the double-beta decay Q-values 76Ge 100Mo with uncertainties less than 200 eV. The value for 76Ge, 2039.04(16) keV is in agreement published SMILETRAP value, 2039.006(50) keV. new 100Mo, 3034.40(17) 30 times more precise previous literature sufficient ongoing neutrinoless searches 100Mo. Moreover, Q-value used calculate phase-space integrals experimental nuclear matrix element decay.
We calculate the nuclear matrix elements of neutrinoless double beta ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) decays $^{76}\mathrm{Ge}$ and $^{82}\mathrm{Se}$ for light neutrino exchange mechanism. The wave functions are obtained by using realistic two-body forces within proton-neutron quasiparticle random-phase approximation (pnQRPA). include effects that come from finite size a nucleon, higher-order terms nucleonic weak currents, nucleon-nucleon short-range correlations....
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.
In this work we perform a systematic study of pairs single-$\ensuremath{\beta}$-decaying nuclei in the mass region $A=100--136$ to extract information on effective value axial-vector coupling constant ${g}_{\mathrm{A}}$. As many-body framework use quasiparticle random-phase approximation (QRPA) and its proton-neutron variant (pnQRPA) single-particle valence bases with Woods-Saxon-calculated energies. It is found that, reasonable approximation, ${g}_{\mathrm{A}}$ linear function number $A$,...
Nuclear matrix elements of the neutrinoless double beta ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) decays $^{96}\mathrm{Zr}$, $^{100}\mathrm{Mo}$, $^{116}\mathrm{Cd}$, $^{128}\mathrm{Te}$, $^{130}\mathrm{Te}$, and $^{136}\mathrm{Xe}$ are calculated for light-neutrino exchange mechanism by using proton-neutron quasiparticle random-phase approximation (pnQRPA) with a realistic nucleon-nucleon force. The particle-particle strength parameter ${g}_{\mathrm{pp}}$ pnQRPA is fixed...
We analyze \ensuremath{\alpha} decays to rotational states in even-even nuclei by using the stationary coupled channels approach. Collective excitations are described rigid rotator model. The \ensuremath{\alpha}-nucleus interaction is given a double folding procedure M3Y plus Coulomb nucleon-nucleon forces. use harmonic oscillator repulsive potential with one independent parameter, simulate Pauli principle. decaying state identified first resonance inside resulting pocketlike potential....
In this work we report on the effects of short-range correlations upon matrix elements neutrinoless double beta decay. We focus calculation neutrino-mass mode decays 48Ca and 76Ge. The nuclear-structure components calculation, that is participant nuclear wave functions, have been calculated in shell-model scheme for proton-neutron quasiparticle random-phase approximation (pnQRPA) compare traditional approach using Jastrow correlation function with more complete unitary operator method...
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 Q values of the 116Cd and 130Te double-beta decaying nuclei were determined by using a Penning trap mass spectrometer. new atomic difference between 116Sn 2813.50(13) keV differs 4.5 is 30 times more precise than previous value 2809(4) keV. for 130Te, 2526.97(23) close to Canadian 2527.01 ± 0.32 (Scielzo et al., 2009) [1], but from Florida State University 2527.518 0.013 (Redshaw [2] 0.55 (2σ). These are sufficiently ongoing neutrinoless decay searches in 130Te. Hence, our used compute...
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...
We study the dominant forbidden transitions in antineutrino spectra of fission actinides from 4 MeV onward using nuclear shell model. Through explicit calculation shape factor, taking into account Coulomb corrections, we show expected changes on cumulative electron and spectra. Compared to usual allowed approximation this results a minor decrease onward, whereas an increase several percent is observed that, despite their limited number, dominate spectral flux for most experimentally...
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.
Detection of the neutrinoless $\ensuremath{\beta}\ensuremath{\beta}$ ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) decay is high priority in particle- and neutrino-physics communities. The detectability this mode strongly influenced by value weak axial-vector coupling constant ${g}_{A}$. recent nuclear-model analyses $\ensuremath{\beta}$ decays suggest that ${g}_{A}$ could be dramatically quenched, reaching ratios ${g}_{A}^{\mathrm{free}}/{g}_{A}\ensuremath{\approx}4$, where...