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NSR database version of May 24, 2024.

Search: Author = S.P.Weppner

Found 19 matches.

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2024RA12      J.Phys.(London) G51, 045101 (2024)

V.Ranga, I.Mazumdar, S.P.Weppner, S.Panwar, R.Sariyal, S.M.Patel, P.B.Chavan, A.K.Rhine Kumar, G.Anil Kumar

Measurement of proton induced absolute production cross-section of 6.13, 6.92 and 7.12 MeV γ-rays from 16O(p, p'γ)16O reaction

NUCLEAR REACTIONS 16O(p, p'), E=6-7 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray production σ. Comparison with a detailed phenomenological optical model potential (OMP), resonance analysis. The TIFR-BARC Pelletron facility at TIFR, Mumbai.

doi: 10.1088/1361-6471/ad1fd3
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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 NNLOopt 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 NNLOopt 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 Ay(θ, E) with NNLOopt 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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2019MA89      Acta Phys.Pol. B50, 377 (2019)

I.Mazumdar, M.Dhibar, S.P.Weppner, G.Anil Kumar, A.K.R.Kumar, S.M.Patel, P.B.Chavan, C.D.Bagdia, L.C.Tribedi

Studies in Nuclear Structure and Big Bang Nucleosynthesis Using Proton Beams

NUCLEAR REACTIONS 12C(p, p'γ), E=8-22 MeV; measured Eγ, Iγ; deduced total σ, σ(θ); calculated total σ and s(θ) using coupled-channels model and single particle model taking into account resonances in 12C. 2H(p, γ), E=100, 175, 250 keV; measured Eγ, Iγ; deduced σ, astrophysical S-factor.

doi: 10.5506/aphyspolb.50.377
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2018WE08      J.Phys.(London) G45, 095102 (2018)


A nucleon-nucleus optical model for A ≤ 13 nuclei at 65-75MeV projectile energy

NUCLEAR REACTIONS 4He(p, p), 1H(6He, p), (8He, p), E=71 MeV; 6,7Li(p, p), E=71, 65 MeV; 9Be(p, p), E=75 MeV; 12,13C(p, p), E=70, 72 MeV; 12C(n, n), E=75 MeV; calculated σ(θ), σ; deduced optical model parameters. Comparison with experimental data.

doi: 10.1088/1361-6471/aad53d
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2013OR02      Phys.Rev. C 88, 034610 (2013)

A.Orazbayev, Ch.Elster, S.P.Weppner

Open shell effects in a microscopic optical potential for elastic scattering of 6(8)He

NUCLEAR REACTIONS 6,8He(p, p), E=71, 100, 200 MeV/nucleon; calculated differential σ(θ, E) and analyzing power Ay(θ, E) as function of momentum transfer, and with variation of matter and charge radii. Optical potential model with single-particle density matrix for 6,8He from simple harmonic oscillator. Comparison with experimental data.

doi: 10.1103/PhysRevC.88.034610
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2012WE02      Phys.Rev. C 85, 044617 (2012)

S.P.Weppner, Ch.Elster

Elastic scattering of 6He based on a cluster description

NUCLEAR REACTIONS 4,6He(p, p), E=71, 100, 200 MeV/nucleon; calculated differential cross section, σ(q), analyzing powers. Optical potential. Cluster description of 6He as 4He+2n system. Folding-cluster model. Comparison with experimental data.

doi: 10.1103/PhysRevC.85.044617
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2009WE04      Phys.Rev. C 80, 034608 (2009); Erratum Phys.Rev. C 89, 049904 (2014)

S.P.Weppner, R.B.Penney, G.W.Diffendale, G.Vittorini

Isospin dependent global nucleon-nucleus optical model at intermediate energies

NUCLEAR REACTIONS 12C, 14N, 16O, 19F, 27Al, 28Si, 31P, 32S, 39K, 40Ca, 48Ti, 51V, 52Cr, 55Mn, 56Fe, 59Co(n, n), E=25-155 MeV; 12,13C, 16,18,20,22O, 27Al, 28Si, 30S, 34,40,42,44Ar, 40,42,44,48Ca, 45Sc, 50,52,54Cr, 54,56Fe, 58Ni(p, p), E=25-155 MeV; analyzed σ, σ(θ) using isospin dependent global nucleon-nucleus optical model. 12,13C, 16O, 28Si, 44Ar, 40,42,44,48Ca, 48,50Ti, 50,52,54Cr, 54,56Fe, 58Ni, 59Ni(polarized p, p), E=30-152 MeV; analyzed vector analyzing powers using isospin dependent global nucleon-nucleus optical model.

doi: 10.1103/PhysRevC.80.034608
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2006PI08      Nucl.Phys. A778, 10 (2006)

J.Piekarewicz, S.P.Weppner

Insensitivity of the elastic proton-nucleus reaction to the neutron radius of 208Pb

NUCLEAR REACTIONS 208Pb(p, p), E=500, 800 MeV; calculated σ(θ); deduced sensitivity to neutron radius. Non-relativistic impulse approximation approach.

doi: 10.1016/j.nuclphysa.2006.08.004
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2000WE03      Phys.Rev. C61, 044601 (2000)

S.P.Weppner, O.Garcia, Ch.Elster

Sensitivities of the Proton-Nucleus Elastic Scattering Observables of 6He and 8He at Intermediate Energies

NUCLEAR REACTIONS 6,8He(polarized p, p), E=66-100 MeV; calculated σ(θ), Ay(θ); deduced sensitivity to structure effects. Several models compared.

doi: 10.1103/PhysRevC.61.044601
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1998EL01      Phys.Rev. C57, 189 (1998); Comment Phys.Rev. C59, 1813 (1999)

Ch.Elster, S.P.Weppner

Energy Dependence of the NN t Matrix in the Optical Potential for Elastic Nucleon-Nucleus Scattering

NUCLEAR REACTIONS 16O, 40Ca, 208Pb(polarized p, p), E=65-200 MeV; calculated σ(θ), A(y), spin rotation function; deduced NN t matrix energy dependence. Full-folding model, impulse approximation. Comparison with data.

doi: 10.1103/PhysRevC.57.189
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1998WE03      Phys.Rev. C57, 1378 (1998)

S.P.Weppner, Ch.Elster, D.Huber

Off-Shell Structures of Nucleon-Nucleon t Matrices and Their Influence on Nucleon-Nucleus Elastic Scattering Observables

NUCLEAR REACTIONS 16O(polarized p, p), E=135, 200 MeV; 40Ca(polarized p, p), E=160, 200 MeV; 208Pb(polarized p, p), E=200 MeV; analyzed σ(θ), A(y)(θ), spin rotation function; deduced sensitivity to off-shell structures.

doi: 10.1103/PhysRevC.57.1378
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1997EL13      Phys.Rev. C56, 2080 (1997)

Ch.Elster, S.P.Weppner, C.R.Chinn

Full-Folding Optical Potentials for Elastic Nucleon-Nucleus Scattering Based on Realistic Densities

NUCLEAR REACTIONS 16O(polarized p, p), E=400, 500 MeV; 40Ca(polarized p, p), E=100 MeV; 90Zr(polarized p, p), E=80 MeV; 208Pb(polarized p, p), E=200 MeV; analyzed σ(θ), A(y), spin rotation function; deduced optical model parameters. 12C, 16O, 28Si, 40Ca, 90Zr, 208Pb(n, n), E=50-500 MeV; analyzed total σ. Full-folding integral, realistic densities.

doi: 10.1103/PhysRevC.56.2080
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1995CH08      Phys.Rev. C51, 1033 (1995)

C.R.Chinn, Ch.Elster, R.M.Thaler, S.P.Weppner

Total Cross Sections for Neutron Scattering

NUCLEAR REACTIONS 16O, 40Ca(n, n), E ≈ 50-700 MeV; calculated σ(E). 16O(polarized n, n), E=100, 500 MeV; calculated σ(θ), analyzing power, spin rotation function vs θ. 16O(n, n), E=50-700 MeV; calculated elastic, reaction σ(E). Watson expansion based microscopic first-order optical potential.

doi: 10.1103/PhysRevC.51.1033
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1995CH12      Phys.Rev. C51, 1418 (1995)

C.R.Chinn, Ch.Elster, R.M.Thaler, S.P.Weppner

Application of Multiple Scattering Theory to Lower-Energy Elastic Nucleon-Nucleus Scattering

NUCLEAR REACTIONS 12C, 16O, 28Si, 40Ca, 56Fe, 90Zr, 208Pb(polarized p, p), (polarized n, n), E=65 MeV; analyzed σ(θ), analyzing power, spin rotation function vs θ. First-order multiple scattering theory.

doi: 10.1103/PhysRevC.51.1418
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1995CH44      Phys.Rev. C52, 1992 (1995)

C.R.Chinn, Ch.Elster, R.M.Thaler, S.P.Weppner

Propagator Modifications in Elastic Nucleon-Nucleus Scattering within the Spectator Expansion

NUCLEAR REACTIONS 12C, 16O, 28Si, 40Ca, 90Zr, 208Pb(n, n), E ≤ 400 MeV; analyzed σ(E). 12C(polarized p, p), E=200 MeV; 16O(polarized p, p), E=100-318 MeV; 28Si(polarized p, p), E=80-200 MeV; 40Ca(polarized p, p), E=80 MeV; 90Zr(polarized p, p), E=65-160 MeV; 208Pb(polarized p, p), E=80, 200 MeV; analyzed σ(θ), analyzing power, spin rotation function vs θ data. Spectator expansion of optical potential.

doi: 10.1103/PhysRevC.52.1992
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