A5082108781- Nuclear physics research studies
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Advanced Chemical Physics Studies
- Nuclear Physics and Applications
- Astrophysics and Cosmic Phenomena
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Radioactive Decay and Measurement Techniques
- Quantum, superfluid, helium dynamics
- Nuclear reactor physics and engineering
- Quantum chaos and dynamical systems
- Scientific Research and Discoveries
- Rare-earth and actinide compounds
- Cold Atom Physics and Bose-Einstein Condensates
- Particle accelerators and beam dynamics
- International Science and Diplomacy
- Twentieth Century Scientific Developments
- Physics of Superconductivity and Magnetism
- Astro and Planetary Science
- Superconducting Materials and Applications
University of North Carolina at Chapel Hill
2015-2024
Universitat de Barcelona
2022
Ben-Gurion University of the Negev
2019
Baruch College
2017
GSI Helmholtz Centre for Heavy Ion Research
2013
Oak Ridge National Laboratory
2013
University of Tennessee at Knoxville
2013
Technical University of Darmstadt
2013
Lawrence Livermore National Laboratory
2010
Peking University
2007
The theoretical and experimental issues relevant to neutrinoless double beta decay are reviewed. impact that a direct observation of this exotic process would have on elementary particle physics, nuclear astrophysics, cosmology is profound. Now neutrinos known mass experiments becoming more sensitive, even the nonobservation will be useful. If actually observed, we immediately learn much about neutrino. status discovery potential proposed reviewed in context, with significant emphasis...
It has been suggested that an apparent correlation of the flux detected solar neutrinos with activity is due to a neutrino magnetic moment. Here several terrestrial experiments might observe moment are considered, emphasis on those employing reactor neutrinos. The charge radius, and prospects for observing it, also discussed. An appendix collects all relevant scattering cross sections.
We show that, within the quasiparticle random phase approximation (QRPA) and renormalized QRPA (RQRPA) based on Bonn-CD nucleon-nucleon interaction, competition between pairing neutron-proton particle-particle particle-hole interactions causes contributions to neutrinoless double-beta decay matrix element nearly vanish at internucleon distances of more than 2 or 3 fermis. As a result, is sensitive short-range/high-momentum physics one naively expects. analyze various ways treating that...
Abstract Molecules containing short-lived, radioactive nuclei are uniquely positioned to enable a wide range of scientific discoveries in the areas fundamental symmetries, astrophysics, nuclear structure, and chemistry. Recent advances ability create, cool, control complex molecules down quantum level, along with recent upcoming species production at several facilities around world, create compelling opportunity coordinate combine these efforts bring precision measurement extreme nuclei. In...
Using the quasiparticle random phase approximation, we calculate nuclear matrix elements governing two-neutrino and neutrinoless double-beta decay. We show that a consistent treatment, including both particle-hole particle-particle interactions, helps to resolve longstanding discrepancy between experimental calculated decay rates. The force, which allows us bring EC/${\ensuremath{\beta}}^{+}$ rates in semimagic nuclei into closer agreement with experiment, is large part responsible for...
We review recent developments in double-beta decay, focusing on what can be learned about the three light neutrinos future experiments. examine effects of uncertainties already measured neutrino parameters and calculated nuclear matrix elements interpretation upcoming decay measurements. then a number proposed
We present a comprehensive mean-field calculation of the Schiff moment nucleus 225Ra, quantity that determines static electric-dipole corresponding atom if time-reversal (T) invariance is violated in nucleus. The breaks all possible intrinsic symmetries nuclear mean field and includes, particular, both exchange direct terms from full finite-range T-violating nucleon-nucleon interaction, effects short-range correlations. resulting moment, which depends on three unknown pion-nucleon coupling...
We describe a multiple scattering model of nucleus-nucleus collisions for use in simulation atmospheric cascades produced by high-energy cosmic-ray nuclei. emphasize the importance realistic treatment nuclear fragmentation incident nucleus fluctuations quantities such as muon bundles and longitudinal development giant air showers. The is realized cascade program that can be combined with any hadronic interactions.
We describe the elastic scattering of weakly interacting dark matter particles from nuclei, with laboratory detection in mind. focus on lightest neutralino (a neutral fermion predicted by supersymmetry) as a likely candidate and discuss physics needed to calculate its cross section interpret experimental results. Particular emphasis is placed proper description structure proposed detector nuclei. include brief discussion expected count rates some detectors.
We derive and compute effective valence-space shell-model interactions from ab initio coupled-cluster theory apply them to open-shell neutron-rich oxygen carbon isotopes. Our are based on nucleon-nucleon three-nucleon forces chiral effective-field theory. the energies of ground low-lying states, find good agreement with experiment. In particular, our computed ${2}^{+}$ states consistent $N=14,16$ shell closures in $^{22,24}\mathrm{O}$, a weaker $N=14$ closure $^{20}\mathrm{C}$. between...
We use the axially deformed Skyrme quasiparticle random-phase approximation (QRPA) together with ${\mathrm{SkM}}^{*}$ energy-density functional, both as originally presented and time-odd part adjusted to reproduce Gamow-Teller resonance energy in ${}^{208}\mathrm{Pb}$, calculate matrix elements that govern neutrinoless double-$\ensuremath{\beta}$ decay of ${}^{76}\mathrm{Ge},\phantom{\rule{0.28em}{0ex}}{}^{130}\mathrm{Te},\phantom{\rule{0.28em}{0ex}}{}^{136}\mathrm{Xe}$,...
Working with Hamiltonians from chiral effective field theory, we develop a novel framework for describing arbitrary deformed medium-mass nuclei by combining the in-medium similarity renormalization group generator coordinate method. The approach leverages ability of first method to capture dynamic correlations and second include collective without violating symmetries. We use our scheme compute matrix element that governs neutrinoless double beta decay $^{48}\mathrm{Ca}$ $^{48}\mathrm{Ti}$,...
Neutrino-nucleus coherent elastic scattering provides a theoretically appealing way to measure the neutron part of nuclear form factors. Using an expansion factors into moments, we show that neutrinos from stopped pions can probe not only second moment factor (the radius) but also fourth moment. simple Monte Carlo techniques for argon, germanium, and xenon detectors 3.5 tonnes, 1.5 300 kg, respectively, radii be found with uncertainty few percent when near neutrino flux...
$\ensuremath{\beta}$-decay rates are an important ingredient in simulations of the astrophysical $r$ process, but parts $r$-process path still not accessible to experiment. The authors develop a computationally efficient method that provides Skyrme-QRPA $\ensuremath{\beta}$-transition strengths for essentially all even-even nuclei, both spherical and deformed, between valley stability neutron drip line. results will be global nucleosynthesis calculations.
We use the finite amplitude method (FAM), an efficient implementation of quasiparticle random phase approximation, to compute beta-decay rates with Skyrme energy-density functionals for 3983 nuclei, essentially all medium-mass and heavy isotopes on neutron rich side stability. employ extension FAM that treats odd-mass odd-odd nuclear ground states in equal filling approximation. Our are reasonable agreement both experimental data where available from other global calculations.
We use coupled-cluster theory and nuclear interactions from chiral effective field to compute the matrix element for neutrinoless double-beta decay of $^{48}$Ca. Benchmarks with no-core shell model in several light nuclei inform us about accuracy our approach. For $^{48}$Ca we find a relatively small element. also two-neutrino quenching factor deduced two-body currents recent ab-initio calculation Ikeda sum-rule [Gysbers et al., Nature Physics 15, 428-431 (2019)].
We use the Lipkin-Meshkov-Glick (LMG) model and valence-space nuclear shell to examine likely performance of variational quantum eigensolvers in nuclear-structure theory. The LMG exhibits both a phase transition spontaneous symmetry breaking at mean-field level one phases, features that characterize collective dynamics medium-mass heavy nuclei. show with appropriate modifications, ADAPT-VQE algorithm, particularly flexible accurate approach, is not troubled by these complications. treat up...
The observation of neutrinoless double-beta ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) decay would offer proof lepton number violation, demonstrating that neutrinos are Majorana particles, while also helping us understand why there is more matter than antimatter in the Universe. If driven by exchange three known light neutrinos, a discovery would, addition, link observed rate to neutrino mass scale through theoretical quantity as nuclear matrix element (NME). Accurate values...
Spectroscopic studies of two beta rays from 100Mo are shown to be potential interest for investigating both the Majorana nu mass by neutrinoless double decay (0nubetabeta) and low energy solar nu's inverse decay. With a multiton detector, coincidence correlated betabeta 0nubetabeta, together with large Q value ( Q(betabeta)), permit identification nu-mass term sensitivity approximately 0.03 eV. Correlation successive 100Tc, capture rates nu's, make it possible detect, in real time,...
We use the canonical Hartree-Fock-Bogoliubov basis to implement a self-consistent quasiparticle-random-phase approximation (QRPA) with arbitrary Skyrme energy density functionals and density-dependent pairing functionals. The point of approach is accurately describe multipole strength functions in spherical even-even nuclei, including weakly bound drip-line systems. method carefully test its accuracy, particularly handling spurious modes. To illustrate our approach, we calculate isoscalar...
We examine isovector and isoscalar neutron-proton correlations in an exactly solvable model based on the algebra SO(8). look particularly closely at Gamow-Teller strength double $\ensuremath{\beta}$ decay, both to isolate effects of two kinds pairing test approximation schemes: renormalized quasiparticle random phase (QRPA) generalized BCS theory. When become strong enough a transition occurs dependence ${\ensuremath{\beta}}^{+}$ isospin changes dramatic unfamiliar way, actually increasing...