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NSR database version of April 27, 2024.

Search: Author = G.Popa

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2023BA32      Phys.Rev. C 108, 044617 (2023)

R.B.Baker, M.Burrows, Ch.Elster, P.Maris, G.Popa, S.P.Weppner

Nuclear structure and elastic scattering observables obtained consistently with different NN interactions

doi: 10.1103/PhysRevC.108.044617
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2022BA43      Phys.Rev. C 106, 064605 (2022)

R.B.Baker, B.McClung, Ch.Elster, P.Maris, S.P.Weppner, M.Burrows, G.Popa

Ab initio nucleon-nucleus elastic scattering with chiral effective field theory uncertainties

NUCLEAR REACTIONS ¹⁶O(p, p), E=65, 100, 135, 180 MeV; ¹²C(p, p), E=65, 100, 122, 160 MeV; ¹²C(n, n), E=65, 95, 155, 185 MeV; calculated σ(E), σ(θ, E), expansion parameter, analyzing power, spin rotation function, Wolfenstein amplitudes. Quantified the truncation uncertainty arising from each order in the chiral EFT. Calculations in frameworks of the spectator expansion of multiple scattering theory as well as the nocore shell model with chiral interaction from the LENPIC collaboration up to the third chiral order. Comparison to available experimental data.

doi: 10.1103/PhysRevC.106.064605
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2021BA24      Phys.Rev. C 103, 054314 (2021)

R.B.Baker, M.Burrows, Ch.Elster, K.D.Launey, P.Maris, G.Popa, S.P.Weppner

Nuclear spin features relevant to ab initio nucleon-nucleus elastic scattering

NUCLEAR STRUCTURE ^4,6,8He; calculated neutron and proton spin-projected, one-body momentum distributions using NNLO_opt chiral interaction, magnetic moments of the 2+ excited states in the ground state rotational bands; deduced spin content of a J=0 wave function, connection between reaction observables such as analyzing powers and structure observables such as magnetic moments in the framework of the spectator expansion with no-core shell model. Relevance to effective interactions for elastic nucleon-nucleus scattering.

doi: 10.1103/PhysRevC.103.054314
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2020BU11      Phys.Rev. C 102, 034606 (2020)

M.Burrows, R.B.Baker, Ch.Elster, S.P.Weppner, K.D.Launey, P.Maris, G.Popa

Ab initio leading order effective potentials for elastic nucleon-nucleus scattering

NUCLEAR REACTIONS ¹H(n, n), (p, p), E=100, 200 MeV; calculated Wolfenstein amplitudes as function of the scatting angle and momentum transfer for NNLO_opt chiral interaction, and CD-Bonn potential. ^4,6,8He, ¹²C, ¹⁶O(p, p), (polarized p, p), E=65, 71, 100, 122, 200 MeV; calculated differential σ(θ, E), analyzing powers A_y(θ, E) with NNLO_opt chiral interaction; deduced leading order ab initio effective potential for nucleon-nucleus elastic scattering using the spectator expansion of multiple scattering theory. ¹²C, ¹⁶O(n, n), E=60-210 MeV; calculated σ(E). Comparison with experimental data.

doi: 10.1103/PhysRevC.102.034606
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2019BU09      Phys.Rev. C 99, 044603 (2019)

M.Burrows, Ch.Elster, S.P.Weppner, K.D.Launey, P.Maris, A.Nogga, G.Popa

Ab initio folding potentials for nucleon-nucleus scattering based on no-core shell-model one-body densities

NUCLEAR REACTIONS ^4,6He, ¹²C, ¹⁶O(p, p), (polarized p, p), E=100, 122, 135, 150, 160, 200 MeV; ¹⁶O(n, n), E=60-200 MeV; calculated σ(E, θ), Ay(θ, E), and point-proton rms radii using Lippmann-Schwinger equation with folding potential obtained from translationally invariant no-core shell model (NCSM) one-body density and the off-shell Wolfenstein amplitudes, with chiral next-to-next-to-leading order (NNLO) interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.99.044603
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2018BU04      Phys.Rev. C 97, 024325 (2018)

M.Burrows, Ch.Elster, G.Popa, K.D.Launey, A.Nogga, P.Maris

Ab initio translationally invariant nonlocal one-body densities from no-core shell-model theory

NUCLEAR STRUCTURE ⁴He, ⁶Li, ¹²C, ¹⁶O; calculated translationally invariant local one-body densities, and K=0 components of the translationally invariant nonlocal one-body density from ab initio no-core shell-model (NCSM) and symmetry-adapted NCSM (SA-NCSM) calculations using the JISP16 nucleon-nucleon interaction; formulation for removing center-of-mass contributions from nonlocal one-body densities.

doi: 10.1103/PhysRevC.97.024325
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2005PO22      Eur.Phys.J. A 25, Supplement 1, 451 (2005)

G.Popa, A.Aprahamian, A.Georgieva, J.P.Draayer

Systematics in the structure of low-lying, non-yrast band-head configurations of strongly deformed nuclei

NUCLEAR STRUCTURE ¹⁵²Nd, ¹⁵⁶Sm, ^156,160Gd, ^160,164Dy, ^164,168Er, ^168,172Yb, ^172,176Hf; calculated band-head energies, collective properties. Pseudo-SU(3) model.

doi: 10.1140/epjad/i2005-06-140-y
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2004PO12      Phys.Rev. C 69, 064307 (2004)

G.Popa, A.Georgieva, J.P.Draayer

Systematics in the structure of low-lying, nonyrast bandhead configurations of strongly deformed nuclei

NUCLEAR STRUCTURE ¹⁵²Nd, ¹⁵⁶Sm, ¹⁶⁰Gd, ¹⁶⁴Dy, ¹⁶⁸Er, ¹⁷²Yb, ¹⁷⁶Hf; calculated ground and excited states energies, configurations. Pseudo-SU(3) model, F-spin classification.

doi: 10.1103/PhysRevC.69.064307
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2002HI24      Acta Phys.Hung.N.S. 16, 291 (2002)

J.G.Hirsch, G.Popa, C.E.Vargas, J.P.Draayer

Microscopic Description of Odd- and Even-Mass Er Isotopes

NUCLEAR STRUCTURE ^{164,165,166,167,168}Er; calculated rotational bands levels, J, π, B(E2). Pseudo-SU(3) scheme, comparison with data.

doi: 10.1556/APH.16.2002.1-4.32
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2001DR06      Acta Phys.Pol. B32, 2697 (2001)

J.P.Draayer, G.Popa, J.G.Hirsch

E2 and M1 Strengths in Heavy Deformed Nuclei

NUCLEAR STRUCTURE ^160,162,164Dy, ¹⁶⁸Er; calculated levels, B(E2), B(M1). Pseudo-SU(3) model, comparisons with data.

2000PO30      Phys.Rev. C62, 064313 (2000)

G.Popa, J.G.Hirsch, J.P.Draayer

Shell Model Description of Normal Parity Bands in Even-Even Heavy Deformed Nuclei

NUCLEAR STRUCTURE ^156,158,160Gd; calculated levels, J, π, B(M1), B(E2) strength distributions. Pseudo-SU(3) model, comparisons with data.

doi: 10.1103/PhysRevC.62.064313
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1997BA24      Nucl.Phys. A617, 368 (1997)

T.Badica, R.Dumitrescu, E.Iacob, A.Olariu, G.Popa, I.V.Popescu, N.Scantei

Spectroscopic Study of the ⁵⁴Fe(¹⁶O, pn)⁶⁸As Reaction

NUCLEAR REACTIONS ⁵⁴Fe(¹⁶O, np), E=42-63 MeV; measured Eγ, Iγ, nγγ-coin, relative excitation functions, Iγ(θ), linear polarization. ⁶⁸As deduced levels, J, π, δ. Enriched ⁵⁴Fe target, hyperpure Ge and NE203 detectors, two-crystal hyperpure Ge polarimeter.

doi: 10.1016/S0375-9474(96)00446-0
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