A5056901977- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Quantum, superfluid, helium dynamics
- Pulsars and Gravitational Waves Research
- Advanced NMR Techniques and Applications
- High-Energy Particle Collisions Research
- Cold Atom Physics and Bose-Einstein Condensates
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Particle physics theoretical and experimental studies
- Scientific Research and Discoveries
- Machine Learning in Materials Science
- Rare-earth and actinide compounds
- Geophysics and Gravity Measurements
- Quantum and electron transport phenomena
- Astro and Planetary Science
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Quantum many-body systems
- Medical Imaging Techniques and Applications
University of Oslo
2014-2024
National Superconducting Cyclotron Laboratory
2012-2024
Michigan State University
2015-2024
Facility for Rare Isotope Beams
2023
Norwegian Computing Center
2023
Thomas Jefferson National Accelerator Facility
2022
Michigan United
2020
The University of Tokyo
2009-2014
Astronomy and Space
2011-2013
Rutgers, The State University of New Jersey
2012
Novel simple properties of the monopole component effective nucleon-nucleon interaction are presented, leading to so-called monopole-based universal interaction. Shell structures shown change as functions $N$ and $Z$ consistently with experiments. Some key cases this shell evolution discussed, clarifying effects central tensor forces. The validity present force is examined in terms low-momentum V$_{low k}$ Q$_{box}$ formalism.
This review treats several pairing-related phenomena in nuclear systems, ranging from superfluidity neutron stars to the gradual breaking of pairs finite nuclei. It focuses on links between many-body pairing, as it evolves underlying nucleon-nucleon interaction into experimental and theoretical manifestations infinite matter, pairing The nature pair correlations nuclei their potential impact structure experiments is discussed, recent evidence that suggests a connection phase transitions (or...
With the goal of developing predictive ab initio capability for light and medium-mass nuclei, two-nucleon three-nucleon forces from chiral effective field theory are optimized simultaneously to low-energy nucleon-nucleon scattering data, as well binding energies radii few-nucleon systems selected isotopes carbon oxygen. Coupled-cluster calculations based on this interaction, named ${\mathrm{NNLO}}_{\mathrm{sat}}$, yield accurate nuclei up $^{40}\mathrm{Ca}$, consistent with empirical...
We present a new effective interaction for shell-model calculations in the model space consisting of single-particle orbits $1{p}_{3/2}$, $0{f}_{5/2}$, $1{p}_{1/2}$, and $0{g}_{9/2}$. Starting with realistic based on Bonn-C potential, 133 two-body matrix elements four energies are modified empirically so as to fit $400$ experimental energy data out $69$ nuclei mass numbers $A=63~96$. The systematics binding energies, electromagnetic moments transitions, low-lying levels described. soft...
We optimize the nucleon-nucleon interaction from chiral effective field theory at next-to-next-to-leading order (NNLO). The resulting new force ${\mathrm{NNLO}}_{\mathrm{opt}}$ yields ${\ensuremath{\chi}}^{2}\ensuremath{\approx}1$ per degree of freedom for laboratory energies below approximately 125 MeV. In $A=3$, 4 nucleon systems, contributions three-nucleon forces are smaller than previous parametrizations interactions. use to study properties key nuclei and neutron matter, we demonstrate...
In the past decade, coupled-cluster theory has seen a renaissance in nuclear physics, with computations of neutron-rich and medium-mass nuclei. The method is efficient for nuclei product-state references, it describes many aspects weakly bound unbound This report reviews technical conceptual developments this results calculations nucleonic matter, exotic isotopes helium, oxygen, calcium, some their neighbors.
We employ interactions from chiral effective field theory and compute the binding energies low-lying excitations of calcium isotopes with coupled-cluster method. Effects three-nucleon forces are included phenomenologically as in-medium two-nucleon interactions, coupling to particle continuum is taken into account using a Berggren basis. The computed ground-state ${J}^{\ensuremath{\pi}}={2}^{+}$ states for $^{42,48,50,52}\mathrm{Ca}$ in good agreement data, we predict excitation energy first...
Advances in machine learning methods provide tools that have broad applicability scientific research. These techniques are being applied across the diversity of nuclear physics research topics, leading to advances will facilitate discoveries and societal applications. This Review gives a snapshot which has been transformed by techniques.
Development of neutron-rich radioactive beams at the Holifield Radioactive Ion Beam Facility has stimulated experimental and theoretical activity in heavy Sn Te isotopes. Recently, g factor first ${2}^{+}$ state $^{132}\mathrm{Te}$ been measured. We report here new shell-model calculation magnetic moments for selected The residual interaction is based on CD-Bonn renormalized $G$ matrix. Single-particle spin orbital effective factors are evaluated microscopically including core polarization...
We perform coupled-cluster calculations for the doubly magic nuclei 4He, 16O, 40Ca and 48Ca, neutron-rich isotopes of oxygen fluorine, employ "bare" secondary renormalized nucleon-nucleon interactions. For interaction from chiral effective field theory at order next-to-next-to-next-to leading order, we find that approximation including triples corrections binds within 0.4 MeV per nucleon compared to data. interactions a resolution-scale dependent similarity renormalization group...
We employ interactions from chiral effective field theory and compute binding energies, excited states, radii for isotopes of oxygen with the coupled-cluster method. Our calculation includes effects three-nucleon forces particle continuum, both which are important description neutron-rich in vicinity nucleus $^{24}\mathrm{O}$. main results placement neutron drip line at $^{24}\mathrm{O}$, assignment spins, parities resonance widths several low-lying states nucleus, an efficient approximation...
New isomeric states in the neutron-rich nuclei near $Z\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}28$ and $N\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}40$ shell closures have been identified among reaction products of a $60.3A$ MeV ${}^{86}\mathrm{Kr}$ beam on ${}^{\mathrm{nat}}\mathrm{Ni}$ target. From measured decay properties information about excited their nuclear structure has obtained. The isomerism is related mostly to occupation neutron ${g}_{9/2}$ orbital, an intruder...
First beta- and gamma-spectroscopic decay studies of the N=82 r-process "waiting-point" nuclide 130Cd have been performed at CERN/ISOLDE using highest achievable isotopic selectivity. Several nuclear-physics surprises discovered. The first one is unanticipatedly high energy 2.12 MeV for [pi g(9/2) multiply sign in circle nu g(7/2)] 1(+) level 130In, which fed by main Gamow-Teller transition. second surprise rather Q(beta) value 8.34 MeV, agreement only with recent mass models that include...
Background: The equation of state (EoS) nucleonic matter is central for the understanding bulk nuclear properties, physics neutron star crusts, and energy release in supernova explosions. Purpose: This work presents coupled-cluster calculations infinite using modern interactions from chiral effective field theory (EFT). It assesses role correlations beyond particle-particle hole-hole ladders, three-nucleon-forces (3NFs) with interactions. Methods: employs optimized nucleon-nucleon NN...
We compute the binding energies, radii, and densities for selected medium-mass nuclei within coupled-cluster theory employ a bare chiral nucleon-nucleon interaction at next-to-next-to-next-to-leading order. find rather well-converged results in model spaces consisting of 15 oscillator shells, doubly magic $^{40}\mathrm{Ca}$, $^{48}\mathrm{Ca}$, exotic $^{48}\mathrm{Ni}$ are underbound by about 1 MeV per nucleon singles-doubles approximation. The binding-energy difference between mirror...
Abstract Ultra-cold Fermi gases exhibit a rich array of quantum mechanical properties, including the transition from fermionic superfluid Bardeen-Cooper-Schrieffer (BCS) state to bosonic Bose-Einstein condensate (BEC). While these properties can be precisely probed experimentally, accurately describing them poses significant theoretical challenges due strong pairing correlations and non-perturbative nature particle interactions. In this work, we introduce Pfaffian-Jastrow neural-network...
We present results from Brueckner-Hartree-Fock calculatons for beta stable neutron star matter with nucleonic and hyperonic degress degrees of freedom, employing the most recent parametrizations baryon-baryon interaction Nijmegen group. It is found that only strange baryons emergin in up to total barionic densities 1.2 fm^-3 are $\Sigma^-$ $\Lambda$. The corresponding equations state then used compute properties stars such as masses radii.
Using many-body perturbation theory and coupled-cluster theory, we calculate the ground-state energy of $^{4}\mathrm{He}$ $^{16}\mathrm{O}$. We perform these calculations using a no-core $G$-matrix interaction derived from realistic nucleon-nucleon potential. Our employ up to two-particle two-hole amplitudes.
The level density at low spin in the 161,162-Dy and 171,172-Yb nuclei has been extracted from primary gamma rays. nuclear heat capacity is deduced within framework of canonical ensemble. exhibits an S-formed shape as a function temperature, which interpreted fingerprint phase transition strongly correlated to uncorrelated phase. critical temperature for quenching pair correlations found Tc=0.50(4) MeV.
The standard and renormalized coupled cluster methods with singles, doubles, noniterative triples their generalizations to excited states, based on the equation of motion approach, are applied 4He 16O nuclei. A comparison results exact diagonalization Hamiltonian in same model space shows that quantum chemistry inspired approximations provide an excellent description ground states bulk correlation effects is obtained at singles doubles level. Triples, treated noniteratively, virtually description.
The unstable neutron-deficient $^{108}\mathrm{Sn}$ isotope has been studied in inverse kinematics by intermediate-energy Coulomb excitation using the RISING/FRS experimental setup at GSI. This is highest Z nucleus so far with this method. Its reduced transition probability B (E2;0${}_{g.s.}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})$ measured for first time. extracted B($E2$) value of $0.230(57){e}^{2}\phantom{\rule{0.3em}{0ex}}{b}^{2}$ determined relative to known stable $^{112}\mathrm{Sn}$...
Rare isotope beams of neutron-deficient 106,108,110Sn from the fragmentation 124Xe were employed in an intermediate-energy Coulomb excitation experiment. The measured B(E2,0(1)(+)-->2(1)(+)) values for 108Sn and 110Sn results obtained 106Sn show that transition strengths these nuclei are larger than predicted by current state-of-the-art shell-model calculations. This discrepancy might be explained contributions protons within Z = 50 shell to structure low-energy excited states this region.
By studying the 109Xe-->105Te-->101Sn superallowed alpha-decay chain, we observe low-lying states in 101Sn, one-neutron system outside doubly magic 100Sn. We find that spins of ground state (J = 7=2) and first excited 5=2) 101Sn are reversed with respect to traditional level ordering postulated for 103Sn heavier tin isotopes. Through simple arguments state-of-the-art shell model calculations explain this unexpected switch terms a transition from single-particle regime collective mode which...