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NSR database version of May 10, 2024.

Search: Author = T.Dytrych

Found 29 matches.

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2024BU02      Phys.Rev. C 109, 014616 (2024)

M.Burrows, K.D.Launey, A.Mercenne, R.B.Baker, G.H.Sargsyan, T.Dytrych, D.Langr

Ab initio translationally invariant nucleon-nucleus optical potentials

doi: 10.1103/PhysRevC.109.014616
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2023HE12      Phys.Rev. C 108, 024304 (2023)

N.D.Heller, G.H.Sargsyan, K.D.Launey, C.W.Johnson, T.Dytrych, J.P.Draayer

New insights into backbending in the symmetry-adapted shell-model framework

NUCLEAR STRUCTURE 48Cr, 20Ne; calculated levels, J, π, backbending, excitation energy vs angular momentum for rotational bands, yrast bands structure, moments of inertia. Symmetry-adapted no-core shell model (SA-NCSM) with the NNLO chiral potential and symmetry-adapted shell model (SA-SM) with the GXPF1 interaction. Comparison to experimental values.

doi: 10.1103/PhysRevC.108.024304
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2023SA50      Phys.Rev. C 108, 054303 (2023)

G.H.Sargsyan, K.D.Launey, R.M.Shaffer, S.T.Marley, N.Dudeck, A.Mercenne, T.Dytrych, J.P.Draayer

Ab initio single-neutron spectroscopic overlaps in lithium isotopes

doi: 10.1103/PhysRevC.108.054303
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2022MO10      Phys.Rev. C 105, 034306 (2022)

O.M.Molchanov, K.D.Launey, A.Mercenne, G.H.Sargsyan, T.Dytrych, J.P.Draayer

Machine learning approach to pattern recognition in nuclear dynamics from the ab initio symmetry-adapted no-core shell model

NUCLEAR STRUCTURE 4He, 16O, 20Ne, 24Si, 20,22,24,26,28,30,32,34,36,38,40,42Mg, 166,168Er, 236U; calculated probability amplitudes of dominant configurations for ground states, shape coexistence and structure patterns using machine learning on ab initio symmetry-adapted no-core shell model calculations. Neural networks with training sets that include only the s- and p-shell nuclei.

doi: 10.1103/PhysRevC.105.034306
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2022SA23      Phys.Rev.Lett. 128, 202503 (2022)

G.H.Sargsyan, K.D.Launey, M.T.Burkey, A.T.Gallant, N.D.Scielzo, G.Savard, A.Mercenne, T.Dytrych, D.Langr, L.Varriano, B.Longfellow, T.Y.Hirsh, J.P.Draayer

Impact of Clustering on the 8Li β Decay and Recoil Form Factors

RADIOACTIVITY 8Li(β-), 8Be(2α); analyzed available data; calculated 8Be low-lying 0+ states, unprecedented constraints on recoil corrections, strong correlation between them and the 8Li ground state quadrupole moment using large-scale ab initio calculations.

doi: 10.1103/PhysRevLett.128.202503
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2021SA18      Phys.Rev. C 103, 044305 (2021)

G.H.Sargsyan, K.D.Launey, R.B.Baker, T.Dytrych, J.P.Draayer

SU(3)-guided realistic nucleon-nucleon interactions for large-scale calculations

NUCLEAR STRUCTURE 12C; calculated excitation energies of the first 2+ and 4+ states, rms radius of the ground state, B(E2) for the first 2+ state, probability amplitudes for configurations that make up the ground state, energies of the proton-neutron system for the positive-parity lowest-lying states up to 5+. SU(3)-coupled or Sp(3, R)-coupled ab initio symmetry-adapted no-core shell model (SA-NCSM) calculation with realistic NN interactions. Comparison with experimental values.

doi: 10.1103/PhysRevC.103.044305
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2020BA35      Phys.Rev. C 102, 014320 (2020)

R.B.Baker, K.D.Launey, S.Bacca, N.N.Dinur, T.Dytrych

Benchmark calculations of electromagnetic sum rules with a symmetry-adapted basis and hyperspherical harmonics

NUCLEAR STRUCTURE 4He; calculated ground state energy, point-proton rms radius, nonenergy and energy weighted sum rules for monopole and dipole transitions, electric dipole polarizability, quadrupole sum rule. Calculations used ab initio symmetry-adapted no-core shell model (SA-NCSM) with the Lanczos algorithm, and JISP16 and N3LO-EM nucleon-nucleon interactions. Comparison with other model predictions.

doi: 10.1103/PhysRevC.102.014320
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2020DR03      Phys.Rev. C 102, 044608 (2020)

A.C.Dreyfuss, K.D.Launey, J.E.Escher, G.H.Sargsyan, R.B.Baker, T.Dytrych, J.P.Draayer

Clustering and α-capture reaction rate from ab initio symmetry-adapted descriptions of 20Ne

NUCLEAR REACTIONS 16O(α, γ)20Ne, E(cm)=1.33 MeV; calculated bound state wave functions and spectroscopic amplitudes for resonances, α partial widths, asymptotic normalization coefficient (ANC) for 20Ne g.s., astrophysical reaction rates at temperatures of 1-10 GK. Calculations of overlap between the 16O+α cluster configuration and states in 20Ne using the ab initio symmetry-adapted no-core shell model (SA-NCSM). Comparison with experimental data.

doi: 10.1103/PhysRevC.102.044608
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2020DY01      Phys.Rev.Lett. 124, 042501 (2020)

T.Dytrych, K.D.Launey, J.P.Draayer, D.J.Rowe, J.L.Wood, G.Rosensteel, C.Bahri, D.Langr, R.B.Baker

Physics of Nuclei: Key Role of an Emergent Symmetry

NUCLEAR STRUCTURE 6Li, 8He, 20Ne; calculated excitation energies of the ground-state rotational band using first-principles of nuclear structure that the special nature of the strong nuclear force determines highly regular patterns unrecognized in nuclei that can be tied to an emergent approximate sy mmetry.

doi: 10.1103/PhysRevLett.124.042501
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2020LA13      Eur.Phys.J. Special Topics 229, 2429 (2020)

K.D.Launey, T.Dytrych, G.H.Sargsyan, R.B.Baker, J.P.Draayer

Emergent symplectic symmetry in atomic nuclei; Ab initio symmetry-adapted no-core shell model

NUCLEAR STRUCTURE 20Ne, 12C; calculated B(E2), deformation parameters, level energies. Comparison with available data.

doi: 10.1140/epjst/e2020-000178-3
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2020MC02      Phys.Rev.Lett. 125, 102505 (2020)

A.E.McCoy, M.A.Caprio, T.Dytrych, P.J.Fasano

Emergent Sp(3, R) Dynamical Symmetry in the Nuclear Many-Body System from an Ab Initio Description

NUCLEAR STRUCTURE 7Be; calculated wave functions, negative parity energy spectrum, J, π.

doi: 10.1103/PhysRevLett.125.102505
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2019KN03      Acta Phys.Pol. B50, 541 (2019)

F.Knapp, T.Dytrych, D.Langr, T.Oberhuber

Importance Basis Truncation in the Symmetry-adapted No-core Shell Model

NUCLEAR STRUCTURE 12C; calculated ground-state energy, low-lying levels energies, B(E2). Ab-initio symmetry-adapted no-core shell model approach (SA-NCSM).

doi: 10.5506/aphyspolb.50.541
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2017DR03      Phys.Rev. C 95, 044312 (2017)

A.C.Dreyfuss, K.D.Launey, T.Dytrych, J.P.Draayer, R.B.Baker, C.M.Deibel, C.Bahri

Understanding emergent collectivity and clustering in nuclei from a symmetry-based no-core shell-model perspective

NUCLEAR STRUCTURE 12C; calculated levels, J, π, basis states, probability distribution for excitations of lowest 0+ and 4+ states, B(E2), M(E0), Hoyle state. 12C, 16,20O, 20,22Mg, 20,22Ne; calculated energies and B(E2) of first excited 0+ state, EGMR, and the lowest excited 2+ state. Symmetry-based no-core symplectic shell model (NCSpM) calculations for ground-state rotational band, the Hoyle state, and its 2+ and 4+ excitations, and the giant monopole 0+ resonance. Comparison with experimental data.

doi: 10.1103/PhysRevC.95.044312
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2016LA15      Prog.Part.Nucl.Phys. 89, 101 (2016)

K.D.Launey, T.Dytrych, J.P.Draayer

Symmetry-guided large-scale shell-model theory

doi: 10.1016/j.ppnp.2016.02.001
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2015DY01      Phys.Rev. C 91, 024326 (2015)

T.Dytrych, A.C.Hayes, K.D.Launey, J.P.Draayer, P.Maris, J.P.Vary, D.Langr, T.Oberhuber

Electron-scattering form factors for 6Li in the ab initio symmetry-guided framework

NUCLEAR REACTIONS 6Li(e, e'), E not given; calculated longitudinal C0 form factors using ab initio symmetry-adapted no-core shell-model description (SA-NCSM) for the bare JISP16 and NNLOopt NN interactions, and for several SU(3)-selected spaces. Comparison with available experimental data.

doi: 10.1103/PhysRevC.91.024326
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2015LA10      Int.J.Mod.Phys. E24, 1530005 (2015)

K.D.Launey, J.P.Draayer, T.Dytrych, G.-H.Sun, S.-H.Dong

Approximate symmetries in atomic nuclei from a large-scale shell-model perspective

NUCLEAR STRUCTURE 8Be, 12C, 18,20,22Ne, 20,22,24Mg, 28Si; analyzed available data; deduced shell-model spaces expansion beyond the current limits to accommodate particle excitations.

doi: 10.1142/S0218301315300052
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2014TO04      Phys.Rev. C 89, 034312 (2014)

G.K.Tobin, M.C.Ferriss, K.D.Launey, T.Dytrych, J.P.Draayer, A.C.Dreyfuss, C.Bahri

Symplectic no-core shell-model approach to intermediate-mass nuclei

NUCLEAR STRUCTURE 20O, 20,22,24Ne, 20,22Mg, 24Si; calculated levels, J, π, B(E2), matter rms radii, quadrupole moments, rotational bands, collective features, elongation β and γ asymmetric configurations. No-core symplectic shell model (NCSpM) with schematic effective many-nucleon long-range interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.89.034312
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2013DR10      Phys.Lett. B 727, 511 (2013)

A.C.Dreyfuss, K.D.Launey, T.Dytrych, J.P.Draayer, C.Bahri

Hoyle state and rotational features in Carbon-12 within a no-core shell-model framework

NUCLEAR STRUCTURE 12C; calculated point-particle rms matter radii and electric quadrupole moments, level energies, J, π, probability distributions of the ground and Hoyle states; deduced guidance for ab initio shell model calculations. No-core shell model.

doi: 10.1016/j.physletb.2013.10.048
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2013DY04      Phys.Rev.Lett. 111, 252501 (2013) `

T.Dytrych, K.D.Launey, J.P.Draayer, P.Maris, J.P.Vary, E.Saule, U.Catalyurek, M.Sosonkina, D.Langr, M.A.Caprio

Collective Modes in Light Nuclei from First Principles

NUCLEAR STRUCTURE 6Li, 6He, 8Be; calculated B(E2), magnetic dipole moments, rms matter radii. ab initio analyses, comparison with available data.

doi: 10.1103/PhysRevLett.111.252501
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2013LU01      Nucl.Phys. A897, 109 (2013)

F.Q.Luo, M.A.Caprio, T.Dytrych

Construction of the center-of-mass free space for the SU(3) no-core shell model

doi: 10.1016/j.nuclphysa.2012.11.003
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2012DR12      J.Phys.:Conf.Ser. 387, 012017 (2012)

J.P.Draayer, T.Dytrych, K.D.Launey, D.Langr, A.C.Dreyfuss, C.Bahri

Symmetry-Adopted Ab Initio Open Core Shell Model Theory

NUCLEAR STRUCTURE 12C; calculated levels, J, π, 2+1 TO ground state γ strength using NCSpM (no-core symplectic model). Compared with data.

doi: 10.1088/1742-6596/387/1/012017
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2012DR13      J.Phys.:Conf.Ser. 366, 012014 (2012)

J.P.Draayer, T.Dytrych, K.D.Launey, D.Langr

Symmetry-Adapted Ab Initio Shell Model for Nuclear Structure Calculations

NUCLEAR STRUCTURE 12C; calculated probability distribution of the lowest calculated 0+ state, deformation using symmetry-adapted ab initio shell model. Also 6,7Li, 16O calculated, but results not given.

doi: 10.1088/1742-6596/366/1/012014
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2012DY04      J.Phys.:Conf.Ser. 387, 012016 (2012)

T.Dytrych, K.D.Launey, J.P.Draayer, D.Langr

Ab initio No-core Shell Model Calculations in a SU(3)-based Coupling Scheme

NUCLEAR STRUCTURE 6Li, 8Be, 12C, 16O; calculated low-lying eigen states, J, π using ab initio no-core shell model with JISP16 NN interaction; deduced strong dominance of few intrinsic spin components.No numbers or figures.

doi: 10.1088/1742-6596/387/1/012016
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2012LA10      Phys.Rev. C 85, 044003 (2012)

K.D.Launey, T.Dytrych, J.P.Draayer

Similarity renormalization group and many-body effects in multiparticle systems

NUCLEAR STRUCTURE A=1-28; calculated effect of two-body and three-body interaction renormalization on ab initio calculation of energy spectra. Similarity renormalization group (SRG), spectral distribution theory (SDT).

doi: 10.1103/PhysRevC.85.044003
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2010DR08      J.Phys.:Conf.Ser. 205, 012006 (2010)

J.P.Draayer, T.Dytrych, K.D.Sviratcheva

Ab Initio Open Core Shell Model for nuclear structure

doi: 10.1088/1742-6596/205/1/012006
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2008DR06      Int.J.Mod.Phys. E17, Supplement 1, 133 (2008)

J.P.Draayer, T.Dytrych, K.D.Sviratcheva, C.Bahri, J.P.Vary

Symplectic no-core shell model

NUCLEAR STRUCTURE 12C, 16O; calculated lowest excited states, J, π. Sympletic no-core shell model (Sp-NCSM).

doi: 10.1142/S0218301308011811
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2008DY01      J.Phys.(London) G35, 095101 (2008)

T.Dytrych, K.D.Sviratcheva, C.Bahri, J.P.Draayer, J.P.Vary

Highly deformed modes in the ab initio symplectic no-core shell model

NUCLEAR STRUCTURE 12C, 16O; calculated wavefunction of ground state rotational band; symplectic basis; deformed many-particle many-hole configurations; no-core shell model.

doi: 10.1088/0954-3899/35/9/095101
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2007DY01      Phys.Rev.Lett. 98, 162503 (2007)

T.Dytrych, Kristina D.Sviratcheva, C.Bahri, J.P.Draayer, J.P.Vary

Evidence for Symplectic Symmetry in Ab Initio No-Core Shell Model Results for Light Nuclei

NUCLEAR STRUCTURE 12C, 16O; calculated ground-state configurations; deduced symplectic symmetry. No-core shell model.

doi: 10.1103/PhysRevLett.98.162503
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2007DY02      Phys.Rev. C 76, 014315 (2007)

T.Dytrych, K.D.Sviratcheva, C.Bahri, J.P.Draayer, J.P.Vary

Dominant role of symplectic symmetry in ab initio no-core shell model results for light nuclei

NUCLEAR STRUCTURE 12C, 16O; calculated B(E2) within the framework of no-core shell model.

doi: 10.1103/PhysRevC.76.014315
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