Publications (63)
Evolving Nuclear Many-Body Forces with the Similarity Renormalization Group
E. D. Jurgenson, P. Navratil, R. J. Furnstahl
In recent years, the Similarity Renormalization Group has provided a powerful and versatile means to soften interactions for ab initio nuclear calculations. The substantial contrib…
Ground-state properties of doubly magic nuclei from the unitary-model-operator approach with the chiral two- and three-nucleon forces
T. Miyagi, T. Abe, M. Kohno +5
The ground-state energies and radii for He, O, and Ca are calculated with the unitary-model-operator approach (UMOA). In the present study, we employ the simila…
Effective Interactions for the Three-Body Problem
T. C. Luu, S. Bogner, W. C. Haxton +1
The three-body energy-dependent effective interaction given by the Bloch-Horowitz (BH) equation is evaluated for various shell-model oscillator spaces. The results are applied to t…
Neutrino-12C scattering in the ab initio shell model with a realistic three-body interaction
A. C. Hayes, P. Navratil, J. P. Vary
We investigate cross sections for neutrino-12C exclusive scattering and for muon capture on 12C using wave functions obtained in the ab initio no-core shell model. In our parameter…
Spurious states in the Faddeev formalism for few-body systems
P. Navratil, B. R. Barrett, W. Gloeckle
We discuss the appearance of spurious solutions of few-body equations for Faddeev amplitudes. The identification of spurious states, i.e., states that lack the symmetry required fo…
Nuclear Electric Dipole Moment of 3He
I. Stetcu, C. -P. Liu, J. L. Friar +2
A permanent electric dipole moment (EDM) of a physical system requires time-reversal (T) and parity (P) violation. Experimental programs are currently pushing the limits on EDMs in…
Ab-initio shell model with a core
A. F. Lisetskiy, B. R. Barrett, M. K. G. Kruse +3
We construct effective 2- and 3-body Hamiltonians for the p-shell by performing 12\hbarΩab initio no-core shell model (NCSM) calculations for A=6 and 7 nuclei and explicitly proje…
Discrepancy between experimental and theoretical -decay rates resolved from first principles
P. Gysbers, G. Hagen, J. D. Holt +8
-decay, a process that changes a neutron into a proton (and vice versa), is the dominant decay mode of atomic nuclei. This decay offers a unique window to physics beyond the st…
Boson-fermion mapping of collective fermion-pair algebras
P. Navratil, H. B. Geyer, J. Dobaczewski
We construct finite Dyson boson-fermion mappings of general collective algebras extended by single-fermion operators. A key element in the construction is the implementation of a s…
SDG fermion-pair algebraic SO(12) and Sp(10) models and their boson realizations
P. Navratil, H. B. Geyer, J. Dobes +1
It is shown how the boson mapping formalism may be applied as a useful many-body tool to solve a fermion problem. This is done in the context of generalized Ginocchio models for wh…
Ab initio investigations of A=8 nuclei: scattering, deformation in He, radiative capture of protons on Be and Li and the X17 boson
P. Navratil, K. Kravvaris, P. Gysbers +3
We apply the No-Core Shell Model with Continuum (NCSMC) that is capable of describing both bound and unbound states in light nuclei in a unified way with chiral two- and three-nucl…
Ab-initio coupled-cluster effective interactions for the shell model: Application to neutron-rich oxygen and carbon isotopes
G. R. Jansen, J. Engel, G. Hagen +2
We derive and compute effective valence-space shell-model interactions from ab-initio coupled-cluster theory and apply them to open-shell and neutron-rich oxygen and carbon isotope…
No-core shell-model calculations with starting- energy-independent multi-valued effective interactions
P. Navratil, B. R. Barrett
Large-space no-core shell model calculations have been performed for A=3-6 nuclei, using a starting-energy-independent two-body effective interaction derived by application of the…
Effective operators from exact many-body renormalization
A. F. Lisetskiy, M. K. G. Kruse, B. R. Barrett +3
We construct effective two-body Hamiltonians and E2 operators for the p-shell by performing ab initio no-core shell model (NCSM) calculations for A=5 and A=6 nuclei and…
The nuclear force imprints revealed on the elastic scattering of protons with C
A. Kumar, R. Kanungo, A. Calci +26
How does nature hold together protons and neutrons to form the wide variety of complex nuclei in the universe? Describing many-nucleon systems from the fundamental theory of quantu…
Spectra and binding energy predictions of chiral interactions for 7Li
A. Nogga, P. Navratil, B. R. Barrett +1
Using the no-core shell model approach, we report on the first results for 7Li based on the next-to-next-to-leading order chiral nuclear interaction. Both, two-nucleon and three-nu…
The He total photo-absorption cross section with two- plus three-nucleon interactions from chiral effective field theory
S. Quaglioni, P. Navratil
The total photo-absorption cross section of He is evaluated microscopically using two- (NN) and three-nucleon (NNN) interactions based upon chiral effective field theory (E…
Ab-initio No-Core Shell Model With Many-Body Forces
M. S. Fayache, J. P. Vary, B. R. Barrett +2
Working in the framework of the ab-initio no-core shell model, we derive two-body effective interactions microscopically for specific harmonic-oscillator basis spaces from the real…
Properties of C in the {\it ab initio} nuclear shell-model
P. Navratil, J. P. Vary, B. R. Barrett
We obtain properties of C in the {\it ab initio} no-core nuclear shell-model. The effective Hamiltonians are derived microscopically from the realistic CD-Bonn and the Argon…
Isoscalar Hamiltonians for light atomic nuclei
G. P. Kamuntavicius, P. Navratil, B. R. Barrett +2
The charge-dependent realistic nuclear Hamiltonian for a nucleus, composed of neutrons and protons, can be successfully approximated by a charge-independent one. The parameters of…
7Be(p,gamma)8B S-factor from ab initio wave functions
P. Navratil, C. A. Bertulani, E. Caurier
Nuclear structure of 7Be, 8B and 7,8Li is studied within the ab initio no-core shell model (NCSM). Starting from the high-precision CD-Bonn 2000 nucleon-nucleon (NN) interaction, w…
Nuclear structure with accurate chiral perturbation theory nucleon-nucleon potential: Application to 6Li and 10B
P. Navratil, E. Caurier
We calculate properties of A=6 system using the accurate charge-dependent nucleon-nucleon (NN) potential at fourth order of chiral perturbation theory. By application of the ab ini…
No-core shell model for 48-Ca, 48-Sc and 48-Ti
J. P. Vary, S. Popescu, S. Stoica +1
We report the first no-core shell model results for , and with derived and modified two-body Hamiltonians. We use an oscillator basis with a limited $\…
Structure of A=10-13 nuclei with two- plus three-nucleon interactions from chiral effective field theory
P. Navratil, V. G. Gueorguiev, J. P. Vary +2
Properties of finite nuclei are evaluated with two-nucleon (NN) and three-nucleon (NNN) interactions derived within chiral effective field theory (EFT). The nuclear Hamiltonian is…
Using spin alignment of inelastically-excited fast beams to make spin assignments: the spectroscopy of 13O as a test case
R. J. Charity, T. B. Webb, J. M. Elson +23
Excited states in 13O were investigated using inelastic scattering of an E/A=69.5-MeV 13O beam off of a 9Be target. The excited states were identified in the invariant-mass spectra…
Reply to Comment on ``Ab Initio Study of 40-Ca with an Importance Truncated No-Core Shell Model''
R. Roth, P. Navratil
We respond to Comment on our recent letter (Phys.Rev.Lett.99:092501,2007) by Dean et al (arXiv:0709.0449).
Reorientation-effect measurement of the first 2 state in C: confirmation of oblate deformation
M. Kumar Raju, J. N. Orce, P. Navratil +6
A Coulomb-excitation reorientation-effect measurement using the TIGRESS ray spectrometer at the TRIUMF/ISAC II facility has permitted the first determination of the $\langle 2…
Large basis ab initio shell model investigation of 9-Be and 11-Be
C. Forssen, P. Navratil, W. E. Ormand +1
We are presenting the first ab initio structure investigation of the loosely bound 11-Be nucleus, together with a study of the lighter isotope 9-Be. The nuclear structure of these…
Toward the Ab-initio Description of Medium Mass Nuclei
C. Barbieri, A. Cipollone, V. Soma +2
As ab-initio calculations of atomic nuclei enter the A=40-100 mass range, a great challenge is how to approach the vast majority of open-shell (degenerate) isotopes. We add realist…
Light nuclei from chiral EFT interactions
P. Navratil, V. G. Gueorguiev, J. P. Vary +3
Recent developments in nuclear theory allow us to make a connection between quantum chromodynamics (QCD) and low-energy nuclear physics. First, chiral effective field theory (chiEF…
P-shell nuclei using Similarity Renormalization Group evolved three-nucleon interactions
E. D. Jurgenson, P. Maris, R. J. Furnstahl +3
The Similarity Renormalization Group (SRG) is used to soften interactions for ab initio nuclear structure calculations by decoupling low- and high-energy Hamiltonian matrix element…
Three-nucleon forces in exotic open-shell isotopes
V. Soma, C. Barbieri, A. Cipollone +2
Advances in the self-consistent Green's function approach to finite nuclei are discussed, including the implementation of three-nucleon forces and the extension to the Gorkov forma…
Nuclear decay as a probe for physics beyond the Standard Model
M. Brodeur, N. Buzinsky, M. A. Caprio +43
This white paper was submitted to the 2022 Fundamental Symmetries, Neutrons, and Neutrinos (FSNN) Town Hall Meeting in preparation for the next NSAC Long Range Plan. We advocate to…
Ab initio calculations of reactions with light nuclei
S. Quaglioni, G. Hupin, A. Calci +2
An {\em ab initio} (i.e., from first principles) theoretical framework capable of providing a unified description of the structure and low-energy reaction properties of light nucle…
Large-basis shell-model calculations for p-shell nuclei
P. Navratil, B. R. Barrett
Results of large-basis shell-model calculations for nuclei with A=7-11 are presented. The effective interactions used in the study were derived microscopically from the Reid93 pote…
Proton distribution radii of C illuminate features of neutron halos
R. Kanungo, W. Horiuchi, G. Hagen +35
Proton radii of C densities derived from first accurate charge changing cross section measurements at 900 MeV with a carbon target are reported. A thick neutron surfac…
The ab initio no-core shell model
C. Forssen, J. Christensson, P. Navratil +4
This contribution reviews a number of applications of the ab initio no-core shell model (NCSM) within nuclear physics and beyond. We will highlight a nuclear-structure study of the…
Refined topology of the N = 20 island of inversion with high precision mass measurements of Na and Mg
E. M. Lykiardopoulou, C. Walls, J. Bergmann +30
Mass measurements of Na and Mg using the TITAN MR-TOF-MS at TRIUMF's ISAC facility are presented, with the uncertainty of the Na mass reduced by over two…
Origin of the anomalous long lifetime of 14C
P. Maris, J. P. Vary, P. Navratil +3
We report the microscopic origins of the anomalously suppressed beta decay of 14C to 14N using the ab initio no-core shell model (NCSM) with the Hamiltonian from chiral effective f…
Four-nucleon shell-model calculations in a Faddeev-like approach
P. Navratil, B. R. Barrett
We use equations for Faddeev amplitudes to solve the shell-model problem for four nucleons in the model space that includes up to 14 hbar Omega harmonic-oscillator excitations abov…
Large-basis shell-model calculation of 10C->10B Fermi matrix element
P. Navratil, B. R. Barrett, W. E. Ormand
We use a shell-model calculation with a two-body effective interaction derived microscopically from the Reid93 potential to calculate the isospin-mixing correction for t…
7Be(p,gamma)8B S-factor from ab initio no-core shell model wave functions
P. Navratil, C. A. Bertulani, E. Caurier
Nuclear structure of 7Be, 8B and 7,8Li is studied within the ab initio no-core shell model (NCSM). Starting from high-precision nucleon-nucleon (NN) interactions, wave functions of…
From nucleons to nuclei to fusion reactions
S. Quaglioni, P. Navratil, R. Roth +1
Nuclei are prototypes of many-body open quantum systems. Complex aggregates of protons and neutrons that interact through forces arising from quantum chromo-dynamics, nuclei exhibi…
Observation of excited states in Mg sheds light on nuclear forces and shell evolution
J. S. Randhawa, R. Kanungo, M. Holl +35
The exotic Borromean nucleus Mg with = 8, located at the proton drip-line provides a unique testing ground for nuclear forces and the evolution of shell structure in the…
Allowed Gamow-Teller Excitations from the Ground State of 14N
S. Aroua, P. Navratil, L. Zamick +5
Motivated by the proposed experiment , we study the final states which can be reached via the allowed Gamow-Teller mechanism. Much emphasis has been given i…
Challenges for Modeling Nuclear Structure: Are the Proton and Neutron Masses and A-body Interactions Relevant?
V. G. Gueorguiev, P. Navratil, J. P. Vary +2
We discuss some of the challenges that future nuclear modeling may face in order to improve the description of the nuclear structure. One challenge is related to the need for A-bod…
Few-nucleon systems in translationally invariant harmonic oscillator basis
P. Navratil, G. P. Kamuntavicius, B. R. Barrett
We present a translationally invariant formulation of the no-core shell model approach for few-nucleon systems. We discuss a general method of antisymmetrization of the harmonic-os…
Nuclear kinetic density from ab initio theory
M. Gennari, P. Navratil
Background: The nuclear kinetic density is one of many fundamental quantities in density functional theory (DFT) dependent on the nonlocal nuclear density. Often, approximations ma…
Proton radii of 4,6,8He isotopes from high-precision nucleon-nucleon interactions
E. Caurier, P. Navratil
Recently, precision laser spectroscopy on 6He atoms determined accurately the isotope shift between 4He and 6He and, consequently, the charge radius of 6He. A similar experiment fo…
Microscopic origins of effective charges in the shell model
P. Navratil, M. Thoresen, B. R. Barrett
We use a large-scale 6 hbar Omega calculation for Li6 with microscopically derived two-body interaction to construct the 0 hbar Omega 0p-shell effective hamiltonian, electric quadr…
Ab initio calculation of symmetry-breaking observables
A Belley, B. Romeo, J. Engel +8
Symmetry-violating observables such as the nuclear anapole and Schiff moments provide sensitive probes of the fundamental symmetries of nature and physics beyond the Standard Model…
Properties of few-electron artificial atoms
K. Varga, P. Navratil, J. Usukura +1
The spectra of quantum dots of different geometry (``quantum ring'', ``quantum cylinder'', ``spherical square-well'' and ``parabolic confinement'') are studied. The stochastic vari…
Shell-model calculations for the three-nucleon system
P. Navratil, B. R. Barrett
We use Faddeev's decomposition to solve the shell-model problem for three nucleons. The dependence on harmonic-oscillator excitations allowed in the model space, up to …
Ab initio shell model with a genuine three-nucleon force for the p-shell nuclei
P. Navratil, W. E. Ormand
The ab initio no-core shell model (NCSM) is extended to include a realistic three-body interaction in calculations for p-shell nuclei. The NCSM formalism is reviewed and new featur…
Evolution of Nuclear Many-Body Forces with the Similarity Renormalization Group
E. D. Jurgenson, P. Navratil, R. J. Furnstahl
The first practical method to evolve many-body nuclear forces to softened form using the Similarity Renormalization Group (SRG) in a harmonic oscillator basis is demonstrated. When…
Application of an ab-initio S-matrix to data analysis of transfer to the continuum reactions populating 11Be
A. Bonaccorso, F. Cappuzzello, D. Carbone +4
Recently, the bound and continuum spectrum of 11Be has been calculated within the ab-initio no-core shell model with continuum (NCSMC) method successfully reproducing the parity in…
Comparison of techniques for computing shell-model effective operators
M. Thoresen, P. Navratil, B. R. Barrett
Different techniques for calculating effective operators within the framework of the shell model using the same effective interaction and the same excitation spaces are presented.…
Ab initio investigation of the Li()Be process and the X17 boson
P. Gysbers, P. Navratil, K. Kravvaris +2
Observations of anomalies in the electron-positron angular correlations in high-energy decays in He, Be, and C have been reported recently by the ATOMKI collaboratio…
Extrapolation Method for the No-Core Shell Model
H. Zhan, A. Nogga, B. R. Barrett +2
Nuclear many-body calculations are computationally demanding. An estimate of their accuracy is often hampered by the limited amount of computational resources even on present-day s…
Benchmark Test Calculation of a Four-Nucleon Bound State
H. Kamada, A. Nogga, W. Gloeckle +15
In the past, several efficient methods have been developed to solve the Schroedinger equation for four-nucleon bound states accurately. These are the Faddeev-Yakubovsky, the couple…
Ab initio no-core shell model and microscopic reactions: recent achievements
S. Quaglioni, P. Navratil
We report on recent microscopic calculations of reaction properties based upon the nuclear structure of the ab initio no-core shell model (NCSM).
Ab Initio Study of 40Ca with an Importance Truncated No-Core Shell Model
R. Roth, P. Navratil
We propose an importance truncation scheme for the no-core shell model, which enables converged calculations for nuclei well beyond the p-shell. It is based on an a priori measure…
Hartree-Fock Approximation for the No-Core Shell Model
M. A. Hasan, J. P. Vary, P. Navratil
The spherical Hartree-Fock approximation is applied to the no-core shell model, with a realistic effective nucleon-nucleon interaction in order to investigate the range…