A5007329784- Neutrino Physics Research
- Nuclear physics research studies
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Quantum Chromodynamics and Particle Interactions
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Nuclear Physics and Applications
- Advanced NMR Techniques and Applications
- Muon and positron interactions and applications
- Quantum, superfluid, helium dynamics
- Collaborative Teaching and Inclusion
- Molecular Spectroscopy and Structure
- Radioactive Decay and Measurement Techniques
- Astrophysics and Cosmic Phenomena
- Rare-earth and actinide compounds
- Radiation Detection and Scintillator Technologies
- Research in Social Sciences
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Astronomical and nuclear sciences
- Material Properties and Applications
- High-pressure geophysics and materials
University of Jyväskylä
2016-2025
Research Institute of the Finnish Economy
2018-2025
Yale University
2013-2024
Centre of Advanced Studies
2024
Center for Theoretical Biological Physics
2011-2023
Lawrence Berkeley National Laboratory
2022
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud
2017-2019
University of Concepción
2011-2016
A complete and improved calculation of phase-space factors for $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay is presented. The makes use exact Dirac wave functions with finite nuclear size electron screening includes lifetimes, single summed spectra, angular correlations.
Background: Direct determination of the neutrino mass through double-$β$ decay is at present time one most important areas experimental and theoretical research in nuclear particle physics. Purpose: We calculate matrix elements for extraction average neutrinoless decay. Methods: The microscopic interacting boson model (IBM-2) used. Results: Nuclear closure approximation are calculated $^{48}$Ca, $^{76}$Ge, $^{82}$Se, $^{96}$Zr, $^{100}$Mo, $^{110}$Pd, $^{116}$Cd, $^{124}$Sn, $^{128}$Te,...
We introduce a method for isospin restoration in the calculation of nuclear matrix elements (NMEs) $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ and $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay within framework microscopic interacting boson model (IBM-2). With this method, we calculate NMEs all processes interest $0\ensuremath{\nu}{\ensuremath{\beta}}^{\ensuremath{-}}{\ensuremath{\beta}}^{\ensuremath{-}}$...
Neutrinoless double-$\beta$ decay is of fundamental importance for the determining neutrino mass. By combining a calculation nuclear matrix elements within framework microscopic interacting boson model (IBM-2) with an improved phase space factors, we set limits on average light mass and inverse heavy (flavor violating parameter).
Neutrinoless double beta decay ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) is a crucial test for lepton number violation. Observation of this process would have fundamental implications neutrino physics, theories beyond the Standard Model and cosmology. Focusing on so-called short-range operators $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ their potential interplay with standard light Majorana exchange, we present first complete calculation relevant nuclear matrix...
Abstract We report the measurement of two-neutrino double-beta ( $$2\nu \beta $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>2</mml:mn><mml:mi>ν</mml:mi><mml:mi>β</mml:mi><mml:mi>β</mml:mi></mml:mrow></mml:math> ) decay $$^{100}$$ xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow /><mml:mn>100</mml:mn></mml:msup></mml:math> Mo to ground state Ru using lithium molybdate $$\hbox {Li}_2^{\;\;100}\hbox {MoO}_4$$...
Neutrinoless double beta decay (0νββ) is a yet unobserved nuclear process that would demonstrate Lepton number violation, clear evidence of beyond standard model physics. The two neutrino (2νββ) allowed by the and has been measured in numerous experiments. In this Letter, we report measurement 2νββ half-life Mo100 to ground state Ru100 [7.07±0.02(stat)±0.11(syst)]×1018 yr CUPID-Mo experiment. With relative precision ±1.6% most precise date rate Mo100. addition, constrain higher-order...
A complete and improved calculation of phase space factors (PSF) for $2\nu\beta^+\beta^+$ $0\nu\beta^+\beta^+$ decay, as well the competing modes $2\nu EC\beta^+$, $0\nu ECEC$, is presented. The makes use exact Dirac wave functions with finite nuclear size electron screening includes life-times, single summed positron spectra, angular correlations.
Effective values of the axial-vector coupling constant ${g}_{\mathrm{A}}$ have lately attracted much attention due to prominent role in determining half-lives double $\ensuremath{\beta}$ decays, particular their neutrinoless mode. The half-life method, i.e., comparing calculated corresponding experimental ones, is most widely used method access effective ${g}_{\mathrm{A}}$. present paper investigates possibilities offered by a complementary method: spectrum-shape (SSM). In SSM, comparison...
Neutrinoless double beta decay can significantly help to shed light on the issue of non-zero neutrino mass, as observation this lepton number violating process would imply neutrinos are Majorana particles. However, underlying interaction does not have be simple standard mass mechanism. The entire variety neutrinoless mechanisms approached effectively. In work we focus a theoretical description short-range effective contributions decay, which equivalent 9-dimensional operators incorporating...
We report on the measurement of two-neutrino double-$\beta$ decay $^{82}$Se performed for first time with cryogenic calorimeters, in framework CUPID-0~experiment. With an exposure 9.95 kg$\times$yr Zn$^{82}$Se, we determine half-life unprecedented precision level, $T_{1/2}^{2\nu} = [8.60 \pm 0.03 \textrm{(stat.)}~^{+0.17}_{-0.10} \textrm{(syst.)}] \times 10^{19}~\textrm{yr}$. The very high signal-to-background ratio, along detailed reconstruction background sources allowed us to identify...
Muon capture on nuclei is one of the most promising probes nuclear electroweak current driving yet-hypothetical neutrinoless double-beta ($0\nu\beta\beta$) decay. Both processes involve vector and axial-vector currents at finite momentum transfer, $q\sim 100$ MeV, as well induced pseudoscalar weak-magnetism currents. Comparing measured muon-capture rates with reliable $ab~initio$ nuclear-theory predictions could help us validate these To this end, we compute partial for $^{6}$Li, $^{12}$C...
Abstract The Q value of the double-beta ( $$\beta ^-\beta ^-$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>β</mml:mi> <mml:mo>-</mml:mo> </mml:msup> </mml:mrow> </mml:math> ) decay $$^{104}$$ <mml:mmultiscripts> <mml:mrow/> <mml:mn>104</mml:mn> </mml:mmultiscripts> Ru $$Q_{\beta ^-}$$ <mml:msub> <mml:mi>Q</mml:mi> </mml:msub> -value) was determined using JYFLTRAP double Penning trap mass spectrometer employing Phase-Imaging Ion Cyclotron Resonance...
The CUPID-Mo experiment, located at the Laboratoire Souterrain de Modane (France), was a demonstrator experiment for CUPID. It consisted of an array 20Li2Mo100O4 (LMO) calorimeters, each equipped with Ge light detector particle identification. In this work, we present result search two-neutrino and neutrinoless double-β decays Mo100 to first 0+ 2+ excited states Ru100 using full exposure (2.71kgyr LMO). We measure half-life 2νββ decay 01+ state as...
In this work we study ordinary muon capture (OMC) on $^{24}$Mg from a first principles perspective. Starting particular two- and three-nucleon interaction derived chiral effective field theory, use the valence-space in-medium similarity renormalization group (VS-IMSRG) framework to construct Hamiltonians muon-capture operators which nonperturbatively account for many-body physics outside valence space. The obtained nuclear matrix elements are compared against those phenomenological shell...
The $^{110}\mathrm{Pd}$ double-$\ensuremath{\beta}$ decay $Q$ value was measured with the Penning-trap mass spectrometer ISOLTRAP to be $Q=2017.85(64)\text{ }\text{ }\mathrm{keV}$. This shifted by 14 keV compared literature and is 17 times more precise, resulting in new phase-space factors for two-neutrino neutrinoless modes. In addition a set of relevant matrix elements has been calculated. expected half-life mode reevaluated as $1.5(6)\ifmmode\times\else\texttimes\fi{}{10}^{20}\text{...
Nuclear matrix elements (NME) for exchange of arbitrary mass neutrinos are calculated in the interacting boson model (IBM-2). By combining NME with phase space factors (PSF), expected half-lives $m_N$ and coupling $U_{eN}$ estimated. Limits on sterile masses eV, keV, MeV-GeV, TeV range given.
Direct determination of the neutrino mass is at present time one most important aims experimental and theoretical research in nuclear particle physics. A possible way detection through neutrinoless double electron capture, $0\nu ECEC$. This process can only occur when energy initial state matches precisely that final state. We here a calculation prefactors (PF) matrix elements (NME) within framework microscopic interacting boson model (IBM-2) for $^{124}$Xe, $^{152}$Gd, $^{156}$Dy,...
A complete calculation of phase space factors (PSF) for Majoron emitting $0\nu\beta^-\beta^-$ decay modes is presented. The makes use exact Dirac wave functions with finite nuclear size and electron screening includes life-times, single spectra, summed angular correlations. Combining these results recent interacting boson matrix elements (NME) we make half-life predictions the ordinary (spectral index $n$=1). Furthermore, comparing theoretical obtained experimental lower bounds this mode are...
Neutrinoless double beta decay ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) processes sample a wide range of intermediate forbidden nuclear transitions, which may be impacted by quenching the axial vector coupling constant (${g}_{A}/{g}_{V}$), uncertainty plays pivotal role in determining sensitivity reach $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ experiments. In this Letter, we present measurements performed on high-resolution ${\mathrm{LiInSe}}_{2}$ bolometer...
The ACCESS (Array of Cryogenic Calorimeters to Evaluate Spectral Shapes) project aims establish a novel technique perform precision measurements forbidden \b{eta}-decays, which can serve as an important benchmark for nuclear physics calculations and represent significant background in astroparticle experiments. will operate pilot array cryogenic calorimeters based on natural doped crystals containing \b{eta}-emitting radionuclides. In this way, (e.g. 113 Cd 115In) synthetic isotopes 99Tc) be...
We present the first search for Majoron-emitting modes of neutrinoless double $\ensuremath{\beta}$ decay ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}{\ensuremath{\chi}}_{0}$) using scintillating cryogenic calorimeters. analyzed CUPID-0 Phase I data a Bayesian approach to reconstruct background sources activities, and evaluate potential contribution $^{82}\mathrm{Se}$ $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}{\ensuremath{\chi}}_{0}$. considered several possible...