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Search: Author = W.Gibbs

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2017GI12      Phys.Rev. C 96, 034001 (2017)

W.R.Gibbs, J.-P.Dedonder

Isospin breaking from diquark clustering

NUCLEAR REACTIONS 1H(p, X), E<30 MeV; analyzed scattering data to deduce one-pion-exchange (OPE) potential. 1H(p, X), (n, X), 1n(n, X), E not given; calculated variations of scattering lengths with parameters of the model for pp, nn and pn scattering, scattering length versus strength parameter, neutron-neutron and pp potentials, crypto-Coulomb (CC) charge symmetry breaking potential. 3H, 3He; calculated mass difference, and Coulomb differences in the three-nucleon system. 4H, 4He; calculated binding energies for hypernuclei, and isospin breaking energy differences as a function of cutoff parameter. Schematic model based on clustering of quark to establish connection between diquark clustering in the two-nucleon system and isospin breaking arising from the Coulomb interaction.

doi: 10.1103/PhysRevC.96.034001
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2012GI01      Phys.Rev. C 86, 024604 (2012)

W.R.Gibbs, J.P.Dedonder

Monte Carlo eikonal scattering

NUCLEAR REACTIONS 4He(α, α), E=2.554, 4.20 GeV; 12C(α, α), E=1.37, 4.20 GeV; 16O(α, α), E=240, 400 MeV; 40Ca(α, α), E=1.37 GeV; 208Pb(α, α), E=288, 340, 480, 699 MeV; 12C(6He, 6He), E=230, 250 MeV; 12C(12C, 12C), E=1.016, 1.449, 1.620, 2.400 GeV; 12C, 40Ca(16O, 16O), E=1.503 GeV; 40Ca(40Ca, 40Ca), E=3.387 GeV; analyzed σ(θ) by calculation of Glauber elastic scattering amplitudes with the center-of-mass and Coulomb corrections. Monte Carlo eikonal method for elastic scattering.

doi: 10.1103/PhysRevC.86.024604
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2008CH14      Phys.Rev. C 77, 054002 (2008)

Q.Chen, C.R.Howell, T.S.Carman, W.R.Gibbs, B.F.Gibson, A.Hussein, M.R.Kiser, G.Mertens, C.F.Moore, C.Morris, A.Obst, E.Pasyuk, C.D.Roper, F.Salinas, H.R.Setze, I.Slaus, S.Sterbenz, W.Tornow, R.L.Walter, C.R.Whiteley, M.Whitton

Measurement of the neutron-neutron scattering length using the π-d capture reaction

NUCLEAR REACTIONS 2H(π-, nγ)n, E=20 MeV; measured neutron time-of-flight spectra, Eγ, Iγ, nγ-coin, neutron-neutron scattering length.

doi: 10.1103/PhysRevC.77.054002
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2008DE14      Phys.Rev. C 77, 044003 (2008)

J.-P.Dedonder, W.R.Gibbs, M.Nuseirat

Phase variation of hadronic amplitudes

doi: 10.1103/PhysRevC.77.044003
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2008GI01      Phys.Rev. C 77, 014003 (2008)

W.R.Gibbs, B.Loiseau

Two-pion exchange contribution to proton-proton scattering at medium energies

NUCLEAR REACTIONS p(p, X), E at 12 GeV/c; calculated amplitudes, pion-quark distributions.

doi: 10.1103/PhysRevC.77.014003
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2007GI04      Phys.Rev. C 75, 035204 (2007)

W.R.Gibbs, R.Arceo

Partial-wave analysis of K+-nucleon scattering

NUCLEAR REACTIONS 1H(K+, X), E at 0.5-1.6 GeV/c; analyzed σ, phase shifts, related data; deduced scattering lengths.

doi: 10.1103/PhysRevC.75.035204
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2007GI09      Nucl.Phys. A790, 315c (2007)

W.R.Gibbs, B.Loiseau

Two pion exchange in proton-proton scattering

NUCLEAR REACTIONS 1H(polarized p, p), E at < 12 GeV/c; analyzed σ(θ=90°, E); deduced spin transfer parameter. Dispersion relations.

doi: 10.1016/j.nuclphysa.2007.03.057
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2005GI21      Phys.Rev. C 72, 065205 (2005)

W.R.Gibbs, R.Arceo

Minimal electromagnetic and mass difference corrections in πN scattering

NUCLEAR REACTIONS 1H(π-, π0), E=10-64 MeV; calculated σ(θ), Coulomb and mass difference corrections. Comparison with data.

doi: 10.1103/PhysRevC.72.065205
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2004DE22      Phys.Rev. C 69, 054611 (2004)

J.-P.Dedonder, W.R.Gibbs

Pion charge exchange on deuterium

NUCLEAR REACTIONS 2H(π+, pπ0), E=228, 294 MeV; analyzed Ep, pp-coin, σ(E, θ); deduced quantum corrections to classical intranuclear cascade model.

doi: 10.1103/PhysRevC.69.054611
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2004GI12      Phys.Rev. C 70, 045208 (2004)

W.R.Gibbs

Pentaquark in K+-d total cross section data

NUCLEAR REACTIONS 2H(K+, X), E at 0.1-0.6 GeV/c; analyzed σ, related data; deduced pentaquark resonance width, energy.

doi: 10.1103/PhysRevC.70.045208
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2004WU09      Braz.J.Phys. 34, 808 (2004)

H.Wu, W.R.Gibbs

Double Charge Exchange on Medium Mass Nuclei

NUCLEAR REACTIONS 56Fe, 93Nb(π+, π-), E=20-240 MeV; calculated σ(θ=5°). Optical model, pseudo-SU(4) model.


2003WU09      Phys.Rev. C 68, 054610 (2003)

H.C.Wu, W.R.Gibbs

Double charge exchange and configuration mixing

NUCLEAR REACTIONS 16,18O, 40Ca(π+, π-), E=20-220 MeV; calculated σ(θ) for ground-state and double-isobaric-analog-state transitions; deduced configuration mixing effects. Comparison with data.

doi: 10.1103/PhysRevC.68.054610
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2002AL11      Phys.Rev. C65, 044609 (2002)

M.Alqadi, W.R.Gibbs

Pion Double Charge Exchange on 4He

NUCLEAR REACTIONS 4He(π+, π-), E=180, 240, 270 MeV; calculated σ(E, θ). Two-nucleon sequential single charge exchange and intranuclear cascade models, comparisons with data.

doi: 10.1103/PhysRevC.65.044609
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2002AL27      Phys.Rev. C 66, 064604 (2002)

M.Alqadi, W.R.Gibbs

Final state interactions in pion production from nuclei

NUCLEAR REACTIONS 2H, 12C, 40Ca, 208Pb(π+, π+π-X), (π+, 2π+X), E=283 MeV; calculated pion pair invariant mass spectra, final state interaction effects. Comparison with data.

doi: 10.1103/PhysRevC.66.064604
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2002WU07      Acta Phys.Hung.N.S. 16, 447 (2002)

H.C.Wu, W.R.Gibbs

Effects of Nuclear Structure in Double Charge Exchange Reactions on 16O and 40Ca

NUCLEAR REACTIONS 16O, 40Ca(π+, π-), E=50 MeV; calculated σ(θ); deduced nuclear structure effects. Comparison with data.

doi: 10.1556/APH.16.2002.1-4.47
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2000GI10      Phys.Rev. C61, 064003 (2000)

W.R.Gibbs, S.A.Coon, H.K.Han, B.F.Gibson

Λ-Neutron Scattering Lengths from Radiative K- Capture

NUCLEAR REACTIONS 2H(K-, γX), E=not given; analyzed data; deduced hyperon-neutron triplet and singlet scattering lengths.

doi: 10.1103/PhysRevC.61.064003
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2000WU07      Phys.Rev. C62, 044614 (2000)

H.C.Wu, W.R.Gibbs

Pion Elastic Scattering and Double Charge Exchange on Heavy Nuclei in the Generalized Seniority Model

NUCLEAR REACTIONS 90Zr, 208Pb(π+, π+), E=30, 40, 50 MeV; 208Pb(π-, π-), E=162 MeV; 128,130Te(π+, π-), E=48 MeV; calculated σ(θ). 128Te(π+, π-), E=20-100 MeV; calculated σ(θ=10°). Generalized seniority model, partial Pauli blocking. Comparison with data.

doi: 10.1103/PhysRevC.62.044614
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2000WU10      Acta Phys.Hung.N.S. 11, 433 (2000)

H.C.Wu, W.R.Gibbs

Pion Elastic Scattering and Double Charge Exchange on Medium and Heavy Nuclei

NUCLEAR REACTIONS 90Zr, 208Pb(π+, π+), E=30-162 MeV; 208Pb(π-, π-), E=162 MeV; 128Te(π+, π-), E=48 MeV; calculated σ(θ); deduced range of π-nucleus interaction. Comparison with data.


1999CO08      Phys.Rev. C59, 1290 (1999)

S.L.Collier, W.R.Gibbs

Elastic Scattering of Pions from the Three-Nucleon System

NUCLEAR REACTIONS 3H, 3He(π+, π+), (π-, π-), E=180 MeV; calculated σ(θ), scattering amplitudes, asymmetries; deduced double-spin-flip correction. Comparison with data.

doi: 10.1103/PhysRevC.59.1290
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1999GI04      Phys.Rev. C59, 2282 (1999)

W.R.Gibbs, R.Ratanarojanakul

Density Determination in a Multidimensional Space

doi: 10.1103/PhysRevC.59.2282
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1999ZH14      Phys.Rev. C59, 3281 (1999)

Q.Zhao, W.R.Gibbs

Pion Scattering from Polarized 3He

NUCLEAR REACTIONS 3He(π+, π+), (π-, π-), E=100-256 MeV; calculated σ(θ), Ay(θ); deduced role of three-body wave function. Polarized target. Comparison with data.

doi: 10.1103/PhysRevC.59.3281
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1999ZH22      Phys.Rev. C60, 024001 (1999)

Q.Zhao, G.Burleson, S.Blanchard, T.Chang, W.Gibbs, J.Haas, B.Park, M.Whitton, M.Espy, D.Dehnhard, B.Larson, J.O'Donnell, M.Palarczyk, W.Cummings, P.Delheij, O.Hausser, E.Pasyuk, M.Gostkin, J.Amann, R.Boudrie, C.Riedel, C.Morris, S.Pentilla, D.Swenson, D.Tupa, J.Comfort, C.Gaulard, K.Maeda, G.Glass, I.Supek

Measurements of Asymmetries of Pion Single Charge Exchange on Polarized 3He at 200 MeV

NUCLEAR REACTIONS 3He(π-, π0), E=200 MeV; measured triton, neutral pion spectra, σ(θ), Ay(θ); deduced small contributions from SS' and SD overlaps. Polarized target. Comparison with theoretical predictions.

doi: 10.1103/PhysRevC.60.024001
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1998GI02      Phys.Rev. C57, 784 (1998)

W.R.Gibbs, L.Ai, W.B.Kaufmann

Low-Energy Pion-Nucleon Scattering

NUCLEAR REACTIONS 1H(π+, π+), (π-, π-), E ≈ 30-90 MeV; analyzed data; deduced pion-nucleon coupling constant, scattering volumes, subthreshold Σ term, off-shell amplitudes. Several data sets used.

doi: 10.1103/PhysRevC.57.784
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1998HO24      Phys.Lett. 444B, 252 (1998)

C.R.Howell, Q.Chen, T.S.Carman, A.Hussein, W.R.Gibbs, B.F.Gibson, G.Mertens, C.F.Moore, C.Morris, A.Obst, E.Pasyuk, C.D.Roper, F.Salinas, I.Slaus, S.Sterbenz, W.Tornow, R.L.Walter, C.R.Whitley, M.Whitton

Toward a Resolution of the Neutron-Neutron Scattering-Length Issue

NUCLEAR REACTIONS 2H(π-, nγ), E not given; measured En, nγ(θ); deduced neutron-neutron scattering length. TOF.

doi: 10.1016/S0370-2693(98)01386-0
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1998LO06      Nucl.Phys. A631, 442c (1998)

B.Loiseau, W.R.Gibbs

Proton-Proton Scattering at 90° for P(lab) up to 12 GeV/c

NUCLEAR REACTIONS 1H(polarized p, p), E at < 12 GeV/c; analyzed spin correlation parameter, σ(θ); deduced multiple pion exchange role.

doi: 10.1016/S0375-9474(98)00044-X
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1998NU02      Phys.Rev. C58, 314 (1998)

M.Nuseirat, M.A.K.Lodhi, W.R.Gibbs

Pion-Nucleus Scattering

NUCLEAR REACTIONS 12C, 16O, 40Ca(π+, π+), E=20-180 MeV; analyzed σ(θ); deduced phase shifts. Nonlocal optical model.

doi: 10.1103/PhysRevC.58.314
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1998NU05      Phys.Rev. C58, 2292 (1998)

M.Nuseirat, M.A.K.Lodhi, M.O.El-Ghossain, W.R.Gibbs, W.B.Kaufmann

Energy Dependence of Pion Double Charge Exchange

NUCLEAR REACTIONS 14C, 42,44,48Ca(π+, π-), E < 250 MeV; calculated σ(E, θ=10°); deduced reaction mechanism possible short-range corrections. Comparison with data.

doi: 10.1103/PhysRevC.58.2292
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1998TO06      Nucl.Phys. A631, 421c (1998)

W.Tornow, T.S.Carman, Q.Chen, W.R.Gibbs, B.F.Gibson, D.E.Gonzalez Trotter, C.R.Howell, A.H.Hussein, G.Mertens, C.F.Moore, C.Morris, A.Obst, E.Pasyuk, C.D.Roper, F.Salinas, D.Schmidt, H.R.Setze, I.Slaus, S.Sterbenz, H.Tang, R.L.Walter, C.R.Whitley, H.Witala, Z.Zhou

Scattering Length Measurements from Radiative Pion Capture and Neutron-Deuteron Breakup

NUCLEAR REACTIONS 2H(π-, 2n), E not given; 2H(n, np), E=13 MeV; measured nn, np scattering lengths; deduced no three-nucleon force effects.

doi: 10.1016/S0375-9474(98)00040-2
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1997ES05      Phys.Rev. C56, 2607 (1997)

M.A.Espy, J.M.O'Donnell, B.Davis, D.Dehnhard, J.L.Langenbrunner, B.Larson, M.Palarczyk, C.M.Riedel, K.Wick, S.Blanchard, G.R.Burleson, W.R.Gibbs, B.Lail, B.Nelson, B.K.Park, Q.Zhao, W.J.Cummings, P.P.J.Delheij, B.K.Jennings, O.Hausser, R.Henderson, D.Thiessen, E.Brash, M.K.Jones, B.Brinkmoller, K.Maeda, F.Merrill, C.L.Morris, S.Penttila, D.Swenson, D.Tupa, C.Bennhold, S.S.Kamalov

Asymmetries for Elastic Scattering of π- from Polarized 3He atΔ Resonance Energies

NUCLEAR REACTIONS 3He(π+, π+), E=142, 180, 256 MeV; 3He(π-, π-), E=180 MeV; measured σ(θ); deduced asymmetries, Δ-n spin-spin interaction. Optically pumped spin polarized target, large acceptance spectrometer. Model comparisons.

doi: 10.1103/PhysRevC.56.2607
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1996ES04      Phys.Rev.Lett. 76, 3667 (1996)

M.A.Espy, D.Dehnhard, C.M.Edwards, M.Palarczyk, J.L.Langenbrunner, B.Davis, G.R.Burleson, S.Blanchard, W.R.Gibbs, B.Lail, B.Nelson, B.K.Park, Q.Zhao, W.J.Cummings, P.P.J.Delheij, B.K.Jennings, R.Henderson, O.Hausser, D.Thiessen, E.Brash, M.K.Jones, B.Larson, B.Brinkmoller, K.Maeda, C.L.Morris, J.M.O'Donnell, S.Penttila, D.Swenson, D.Tupa, C.Bennhold, S.S.Kamalov

Asymmetries for Elastic Scattering of π+ from Polarized 3He and the Δ-Neutron Spin-Spin Interaction

NUCLEAR REACTIONS 3He(π+, π+), E=142-256 MeV; measured energy spectra, asymmetry vs θ; deduced Δ-n spin-spin interaction role. Polarized target.

doi: 10.1103/PhysRevLett.76.3667
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1995GI08      Phys.Rev.Lett. 74, 3740 (1995)

W.R.Gibbs, A.Li, W.B.Kaufmann

Isospin Breaking in Low-Energy Pion-Nucleon Scattering

NUCLEAR REACTIONS 1H(π+, π+), (π-, π-), (π-, π0), E=30-50 MeV; analyzed amplitudes obtained from data; deduced clear iso-spin breaking indications.

doi: 10.1103/PhysRevLett.74.3740
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1994GI08      Phys.Rev. C50, 2742 (1994)

W.R.Gibbs, B.Loiseau

Neutron-Proton Charge Exchange

NUCLEAR REACTIONS 1H(polarized p, n), (p, n), E at ≤ 500 MeV/c; analyzed σ(θ), polarization observables data; deduced nucleon quark constituents pions exchange role.

doi: 10.1103/PhysRevC.50.2742
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1993SI15      Phys.Rev. C48, 1939 (1993)

P.B.Siegel, W.R.Gibbs

Pion Scattering from Spin 1/2 Nuclei

NUCLEAR REACTIONS 13C(π+, π+), (π-, π-), E=114-226 MeV; analyzed σ(θ), analyzing power data. 15N(π+, π+), E=164 MeV; analyzed analyzing power data; deduced mechanism. DWIA, spin-dependent optical potential.

doi: 10.1103/PhysRevC.48.1939
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1993ZU01      Phys.Rev.Lett. 71, 1796 (1993)

J.D.Zumbro, C.L.Morris, J.A.McGill, S.J.Seestrom, R.M.Whitton, C.M.Edwards, A.L.Williams, M.R.Braunstein, M.D.Kohler, B.J.Kriss, S.Hoibraten, R.J.Peterson, J.Ouyang, J.E.Wise, W.R.Gibbs

Inclusive Scattering of 500-MeV Pions from Carbon

NUCLEAR REACTIONS C(π+, π+X), (π-, π-X), E=500 MeV; measured inclusive σ(θ, E(π)); deduced comparison with (e, e'X).

doi: 10.1103/PhysRevLett.71.1796
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1992GI07      Phys.Rev. C46, 1825 (1992)

W.R.Gibbs, J.-P.Dedonder

Neutron Radii of the Calcium Isotopes

NUCLEAR STRUCTURE 40,42,44,48Ca; analyzed pion scattering data; deduced neutron, proton radii, difference. Multiple scattering theory.

NUCLEAR REACTIONS 44Ca(π-, π-), E not given; analyzed σ(θ). Multiple scattering theory.

doi: 10.1103/PhysRevC.46.1825
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1992KA35      Phys.Rev. C46, 1474 (1992)

W.B.Kaufmann, P.B.Siegel, W.R.Gibbs

Deeply Bound Pionic Atoms Via the (π-, p) Reactions

NUCLEAR REACTIONS 58Ni(π-, p), E=20-50 MeV; 58Ni(π-, n), E=50 MeV; calculated σ(θ), pion capture of 1s atomic level. Distorted wave impulse approximation, direct capture into atomic level.

ATOMIC PHYSICS 58Ni(π-, p), E=20-50 MeV; 58Ni(π-, n), E=50 MeV; calculated σ(θ), pion capture of 1s atomic level. Distorted wave impulse approximation, direct capture into atomic level.

doi: 10.1103/PhysRevC.46.1474
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1992LA17      Phys.Rev.Lett. 69, 1508 (1992)

J.Langenbrunner, M.K.Jones, D.Dehnhard, C.L.Morris, W.R.Gibbs

Evidence for Direct Triton Knockout in the 4He(π, π't)p Reaction

NUCLEAR REACTIONS 4He(π+, π+t), (π-, π-t), E=180 MeV; measured σ(θ(π), θ(p)); deduced direct triton knockout mechanism role.

doi: 10.1103/PhysRevLett.69.1508
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1991GI02      Phys.Rev. C43, 1012 (1991)

W.R.Gibbs, B.F.Gibson

Neutron Radius Analysis in the Trinucleon System from Pion Scattering

NUCLEAR REACTIONS 3H, 3He(π+, π+), (π-, π-), E not given; analyzed σ(θ). 3H, 3He deduced relative neutron-proton radii.

doi: 10.1103/PhysRevC.43.1012
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1991GI06      Phys.Rev.Lett. 67, 1395 (1991)

W.R.Gibbs, A.C.Hayes

Determination of the Radius of the 11Li Neutron Halo from Pion Double Charge Exchange

NUCLEAR REACTIONS 11B(π-, π+), E not given; analyzed data. 11Li deduced neutron halo radius.

doi: 10.1103/PhysRevLett.67.1395
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1990CA09      Phys.Rev. C41, 1637 (1990)

F.Cannata, J.P.Dedonder, W.R.Gibbs

Optical Potentials for Charged-Hadron-Nucleus Scattering: Role of Coulomb excitations

NUCLEAR REACTIONS 40Ca(π+, π+), (π-, π-), E=50-180 MeV; calculated σ(θ); deduced Coulomb shift role.

doi: 10.1103/PhysRevC.41.1637
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1990GI05      Phys.Rev. C41, 2726 (1990)

W.R.Gibbs, W.R.Kaufmann, B.Loiseau, M.Lacombe, R.Vinh Mau

Investigating Fundamental Antiproton-Nucleon Interactions by Means of (p-bar)-Nucleus Elastic Scattering

NUCLEAR REACTIONS 12C(p-bar, p-bar), E=46.8 MeV; analyzed σ(θ); deduced interaction energy dependence.

doi: 10.1103/PhysRevC.41.2726
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1989GI08      Phys.Lett. 231B, 6 (1989)

W.R.Gibbs, W.B.Kaufmann, J.-P.Dedonder

The Pion-Nucleus Resonance and Nuclear Translucence

NUCLEAR REACTIONS 12C(π, π), E=10-80 MeV; calculated pion-nucleus s-wave phase shift; deduced nuclear translucence effect.

doi: 10.1016/0370-2693(89)90102-0
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1989HE08      Phys.Rev. C39, 1896 (1989)

L.Heller, W.R.Gibbs

π- Capture on the Deuteron as a Dibaryon Search

NUCLEAR REACTIONS 2H(π-, π+X), E at rest; calculated capture rate; deduced dibaryon search relevance.

ATOMIC PHYSICS, Mesic-Atoms 2H(π-, π+X), E at rest; calculated capture rate; deduced dibaryon search relevance.

doi: 10.1103/PhysRevC.39.1896
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1989KA27      Phys.Rev. C40, 1729 (1989)

W.B.Kaufmann, W.R.Gibbs

K+-Nucleus Total Cross Section Analysis

NUCLEAR REACTIONS 2H, 6Li, 12C, 16O, 28Si(K+, X), E at 550-800 MeV/c; analyzed σ extraction methods; deduced corrections.

doi: 10.1103/PhysRevC.40.1729
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1989LE11      Phys.Rev. C39, 2356 (1989)

M.J.Leitch, H.W.Baer, R.L.Burman, C.L.Morris, J.N.Knudson, J.R.Comfort, D.H.Wright, R.Gilman, S.H.Rokni, E.Piasetzky, Z.Weinfeld, W.R.Gibbs, W.B.Kaufmann

14C(π+, π-)14O Reaction between 19 and 80 MeV

NUCLEAR REACTIONS 14C(π+, π-)14O, E=19-80 MeV; measured σ(θ) vs E. 14O deduced double IAS excitation. DWIA, optical model.

doi: 10.1103/PhysRevC.39.2356
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1988AU05      Phys.Rev. C38, 1277 (1988)

N.Auerbach, W.R.Gibbs, J.N.Ginocchio, W.B.Kaufmann

Pion-Nucleus Double Charge Exchange and the Nuclear Shell Model

NUCLEAR REACTIONS 42,44,46,48Ca, 46,48,50Ti, 52Cr, 54Fe(π+, π-), E=35, 45, 292 MeV; calculated ground, IAS transition σ(θ). Shell model.

doi: 10.1103/PhysRevC.38.1277
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1987AU03      Phys.Rev.Lett. 59, 1076 (1987)

N.Auerbach, W.R.Gibbs, E.Piasetzky

Pion Double Charge Exchange and the Nuclear Shell Model

NUCLEAR REACTIONS 42,44,46,48Ca(π+, π-), E=35 MeV; calculated double charge exchange σ.

doi: 10.1103/PhysRevLett.59.1076
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1987KA03      Phys.Rev. C35, 838 (1987)

W.B.Kaufmann, W.R.Gibbs

Deser-Goldberger-Baumann-Thirring Formula for π-p Atoms

NUCLEAR REACTIONS 1n(π0, π0), E=3.3-6.5 MeV; calculated σ(E). 1H(π-, π-), E not given; calculated scattering lengths. Dester-Goldberger-Baumann-Thirring formula.

ATOMIC PHYSICS, Mesic-Atoms 1H; calculated pionic level shifts, widths. Deser-Goldberger-Baumann-Thirring formula.

doi: 10.1103/PhysRevC.35.838
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1987SI18      Phys.Rev. C36, 2473 (1987)

P.B.Siegel, W.R.Gibbs

Meson-Nucleus Interactions using Polarized Nuclei

NUCLEAR REACTIONS 10B(π+, π0), E=70, 165 MeV; calculated asymmetry vs θ. Polarized target.

doi: 10.1103/PhysRevC.36.2473
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1986SI04      Phys.Rev. C33, 1407 (1986)

P.B.Siegel, W.R.Gibbs

Pion-Nucleon Charge Exchange and Scattering at Low Energies

NUCLEAR REACTIONS 1H(π+, π+), (π-, π-), E ≈ 0-100 MeV; calculated phase shifts, σ(θ). 1n(π+, π0), 1H(π-, π0), E=35-65 MeV; calculated σ(θ), σ(E). Coupled-channels, non-local potentials.

doi: 10.1103/PhysRevC.33.1407
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1985SI09      Phys.Rev. C31, 2184 (1985)

P.B.Siegel, W.B.Kaufmann, W.R.Gibbs

K+ as a Probe of Partial Deconfinement in Nuclei

NUCLEAR REACTIONS 12C, 40Ca(K+, K+), E at 300-800 MeV/c; calculated σ(θ), σ(E), σ(12C)/σ(2H); deduced K+-nucleon interaction, phase shift nucleon size dependence.

doi: 10.1103/PhysRevC.31.2184
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1984GI11      Phys.Lett. 145B, 1 (1984)

W.R.Gibbs, W.B.Kaufmann

Antiprotonic Atomic Energy Levels via the (p(bar), p) Reaction

NUCLEAR REACTIONS 31P(p-bar, p), E=150 MeV; calculated σ(θ). 31P, 19F, 23Na(p-bar, p), E=100 MeV; calculated σ(θ=0°); deduced possible antiprotonic atom level detection. DWIA.

doi: 10.1016/0370-2693(84)90934-1
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1984SI13      Phys.Rev. C30, 1256 (1984)

P.B.Siegel, W.B.Kaufmann, W.R.Gibbs

K+-Nucleus Elastic Scattering and Charge Exchange

NUCLEAR REACTIONS 12C, 40Ca(K+, K+), E=446.4, 425, 433, 440 MeV; 13C(K+, K0), E=100-400 MeV; calculated σ(θ), σ(θ) vs E; deduced medium effects. DWIA analysis, multiple scattering theory.

doi: 10.1103/PhysRevC.30.1256
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1983KA19      Phys.Rev. C28, 1286 (1983)

W.B.Kaufmann, W.R.Gibbs

Nuclear Medium Effects in Pion Elastic Scattering and Charge Exchange

NUCLEAR REACTIONS 12C(π+, π+), E=165 MeV; calculated σ(θ). 7Li, 15N, 13C(π+, π0), E=40-240 MeV; calculated σ(0°), σ vs E, σ(θ); deduced binding, Pauli blocking correction effects. Pion-nucleus optical model, three-body approximation.

doi: 10.1103/PhysRevC.28.1286
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1982GA19      Nucl.Phys. A381, 487 (1982)

H.Garcilazo, W.R.Gibbs

The Contribution of Pion Absorption with Two-Nucleon Emission to the Pion-Nucleus Optical Potential

NUCLEAR REACTIONS C(π, X), E=20-140 MeV; calculated σ(absorption), σ(reaction). Quasielastic scattering, pion absorption, two nucleon emission.

doi: 10.1016/0375-9474(82)90372-4
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1982RA34      Phys.Rev.Lett. 48, 781 (1982)

R.D.Ransome, C.L.Hollas, P.J.Riley, B.E.Bonner, W.R.Gibbs, M.W.McNaughton, J.E.Simmons, T.S.Bhatia, G.Glass, J.C.Hiebert, L.C.Northcliffe, W.B.Tippens

Spin Dependence In Neutron-Proton Charge Exchange At 790 Mev

NUCLEAR REACTIONS 1H(n, n), E=790 MeV; measured products, Ep, Ip; deduced polarization data. Data were imported from EXFOR entry 13538.

doi: 10.1103/PhysRevLett.48.781
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset13538.


1981GA07      Nucl.Phys. A356, 284 (1981)

H.Garcilazo, W.R.Gibbs

Corrections to the Closure Approximation for the Pion-Nucleon T-Matrix inside the Nucleus

NUCLEAR REACTIONS 12C(π, π), (π, X), E=30-150 MeV; 12C(π+, π+), (π-, π-), E=30, 50 MeV; calculated σ(θ), σ(reaction) vs E. Three-body model optical potential, closure approximation.

doi: 10.1016/0375-9474(81)90190-1
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1981GI10      Phys.Lett. 103B, 281 (1981)

W.R.Gibbs

Statistical Intermediate Structures in Compound Nucleus Reactions

NUCLEAR REACTIONS 12C(12C, 12C), E(cm)=10-30 MeV; 16O(16O, 16O), E(cm)=15-35 MeV; calculated σ(θ, E); deduced intermediate structure, widths. Stochastic theory.

doi: 10.1016/0370-2693(81)90224-0
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1981PO10      Phys.Rev. C23, 2648 (1981)

W.N.Polyzou, W.R.Gibbs, G.J.Stephenson, Jr.

Energy Shift Effects in Pion-Nucleus Charge Exchange

NUCLEAR REACTIONS 13C(π+, π0), E=162 MeV; calculated σ(θ); deduced core isospin splitting effects. Plane, distorted wave analyses.

doi: 10.1103/PhysRevC.23.2648
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1978GI13      Phys.Rev. C18, 1761 (1978)

W.R.Gibbs, B.F.Gibson, G.J.Stephenson, Jr.

Threshold Pion Photoproduction and Radiative Pion Capture. III. 3He → 3H

NUCLEAR REACTIONS 3He(π-, γ), 3He(π-, π0); calculated threshold cross sections, capture rate, Panofsky ratio.

doi: 10.1103/PhysRevC.18.1761
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1978YO02      Phys.Rev. C17, 837 (1978)

S.K.Young, W.R.Gibbs

Effect of Pion Distortion on the Asymmetry in (p, P+) Reactions on Light Nuclei

NUCLEAR REACTIONS 12C, 16O(polarized p, π+), E=200 MeV; calculated asymmetry.

doi: 10.1103/PhysRevC.17.837
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1977GI04      Phys.Rev.C15, 1384 (1977)

W.R.Gibbs, B.F.Gibson, A.T.Hess, G.J.Stephenson, Jr.

Pion Double Charge Exchange on 4He

NUCLEAR REACTIONS 4He(π-, π+), E=0-500 MeV; calculated σ(E, θ).

doi: 10.1103/PhysRevC.15.1384
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1977GI06      Phys.Lett. 68B, 205 (1977)

W.R.Gibbs, A.T.Hess

A Model for Estimating (p, π+) Cross Sections

NUCLEAR REACTIONS 2H(p, π+), E=330, 470, 590 MeV; 12C(p, π+), E=185 MeV; 3He(p, π+), E=415 MeV; calculated σ(θ).

doi: 10.1016/0370-2693(77)90270-2
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1977GI09      Phys.Rev. C16, 322 (1977)

W.R.Gibbs, B.F.Gibson, G.J.Stephenson, Jr.

Threshold Charged-Pion Photoproduction and Radiative Pion Capture. I. The Nucleon

NUCLEAR REACTIONS 1H(π-, γ), (γ, π+); calculated threshold σ, capture rate.

doi: 10.1103/PhysRevC.16.322
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1977GI10      Phys.Rev. C16, 327 (1977); Erratum Phys.Rev. C17, 856 (1978)

W.R.Gibbs, B.F.Gibson, G.J.Stephenson, Jr.

Threshold Charged-Pion Photoproduction and Radiative Pion Capture. II. π-d → γnn

NUCLEAR REACTIONS 2H(π-, γ); calculated capture rate, n-n scattering length.

doi: 10.1103/PhysRevC.16.327
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1977GI16      Phys.Rev.Lett. 39, 1316 (1977)

W.R.Gibbs, B.F.Gibson, G.J.Stephenson, Jr.

Evidence for the Lorentz-Lorenz Effect in Low-Energy Pion-Nucleus Scattering

NUCLEAR REACTIONS 16O(π+, π+), E=50 MeV; calculated strength parameters.

doi: 10.1103/PhysRevLett.39.1316
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1976GI01      Phys.Rev.Lett. 36, 85 (1976)

W.R.Gibbs, B.F.Gibson, A.T.Hess, G.J.Stephenson, Jr., W.B.Kaufmann

Pion Charge-Exchange Scattering from Light Nuclei

NUCLEAR REACTIONS 7Li, 10B, 13C(π+, π0); calculated σ(E).

doi: 10.1103/PhysRevLett.36.85
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1976GI06      Phys.Rev. C13, 2433 (1976)

W.R.Gibbs, B.F.Gibson, A.T.Hess, G.J.Stephenson, Jr., W.B.Kaufmann

Elastic Pion-4He Scattering

NUCLEAR REACTIONS 4He(π+, π+), (π-, π-), E=24-110 MeV; calculated σ(θ).

doi: 10.1103/PhysRevC.13.2433
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1976PR11      Phys.Lett. 65B, 31 (1976)

B.M.Preedom, C.W.Darden, R.D.Edge, T.Marks, M.J.Saltmarsh, K.Gabathuler, E.E.Gross, C.A.Ludemann, P.Y.Bertin, M.Blecher, K.Gotow, J.Alster, R.L.Burman, J.P.Perroud, R.P.Redwine, B.Goplen, W.R.Gibbs, E.L.Lomon

The Deuteron D-State and the π+ + d → p + p Reaction

NUCLEAR REACTIONS 2H(π+, 2p), E=40, 50, 60 MeV; measured σ(θ); deduced deuteron d-state probability.

doi: 10.1016/0370-2693(76)90527-X
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1974GO07      Phys.Rev.Lett. 32, 1012 (1974)

B.Goplen, W.R.Gibbs, E.L.Lomon

Off-Shell Effects in Pion-Deuteron Absorption

NUCLEAR REACTIONS 2H(π+, 2p); calculated σ.

doi: 10.1103/PhysRevLett.32.1012
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1974KA07      Phys.Rev. C9, 1340 (1974)

W.B.Kaufmann, J.C.Jackson, W.R.Gibbs

Charge-Exchange Reactions on Light Nuclei in a Multiple-Scattering Formalism

NUCLEAR REACTIONS 18O(π+, π0), E=180 MeV; calculated σ(E); 18O(π+, π-), E=180 MeV; calculated σ(E); 13C(π+, π0), E=30-200 MeV; calculated σ(E); 13C(π+, π0), E=180 MeV; calculated σ(θ); 9Be(π+, π0), E=30-250 MeV; calculated σ(E); 9Be(π+, π-), E=30-250 MeV; calculated σ(E) to T=3/2 final states; 9Be(π+, π0), E=175 MeV; calculated σ(θ) to ground, sum of final states; 9Be(π+, π-), E=175 MeV; calculated σ(θ) to T=3/2 final states; 11B(π+, π0), E=20-250 MeV; calculated σ(E) to ground, sum of final states.

doi: 10.1103/PhysRevC.9.1340
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1972GI04      Phys.Rev. C5, 755 (1972)

W.R.Gibbs

Multiple Scattering of Pions by 12C

NUCLEAR REACTIONS 12C(π, π), (π, π'), E=120-280 MeV; calculated σ(E;θ).

doi: 10.1103/PhysRevC.5.755
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1972LE34      Phys.Rev. C6, 1240 (1972)

R.B.Leachman, P.Fessenden, W.R.Gibbs

Variation of the 32S Compound-Nucleus Width with Energy and Spin

NUCLEAR REACTIONS 31P(p, α), 16O(16O, α), Ep=5.2-5.6 MeV;E(16o)=25-36 MeV; measured σ(E;θ). 32S deduced coherence widths.

doi: 10.1103/PhysRevC.6.1240
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1971FE01      Phys.Rev. C3, 807 (1971)

P.Fessenden, W.R.Gibbs, R.B.Leachman

Nuclear-State Widths of Medium-Weight Nuclei in the Continuum

NUCLEAR REACTIONS 75As, 89Y, 103Rh, 107,109Ag, 115In(p, α), E < 14 MeV; measured σ(E;θ). 76Se, 90Zr, 104Pd, 108,110Cd, 116Sn deduced resonances, level-width.

doi: 10.1103/PhysRevC.3.807
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1971GI01      Phys.Rev. C3, 1127 (1971)

W.R.Gibbs

Multiple Scattering of Pions by Deuterons

NUCLEAR REACTIONS 2H(π, π), E=85, 142 MeV; calculated σ(θ).

doi: 10.1103/PhysRevC.3.1127
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1965BR40      Phys.Rev. 139, B354 (1965)

H.C.Britt, W.R.Gibbs, J.J.Griffin, R.H.Stokes

(d, p-f) Angular-Correlation Study of Fission-Barrier Transition States: Energy Gap of a Highly Deformed Nucleus

NUCLEAR REACTIONS, Fission 233U, 239Pu(d, pF), E=14.9 MeV; measured σ(Ep, θ(p), θ(fragment)). 234U, 240Pu deduced fission-barrier transition states.

doi: 10.1103/PhysRev.139.B354
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1965DE17      Phys.Rev. 139, B1170 (1965)

G.Dearnaley, W.R.Gibbs, R.B.Leachman, P.C.Rogers

Investigation of the Al27(α, p) Reaction by Cross-Section Fluctuation Studies

NUCLEAR STRUCTURE 30Si; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.139.B1170
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1965GI01      Nucl.Phys. 62, 548 (1965)

W.R.Gibbs, W.Gruebler

Spin-Orbit Effects in the Ne20(d, nγ)Na21 Reaction

NUCLEAR REACTIONS 20Ne(d, nγ), E=1.84, 2.36, 2.87 MeV; measured Eγ, σ(E, θ nγ). 21Na deduced level, J, delta(E2/M1). Natural target.

doi: 10.1016/0029-5582(65)90580-8
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1963GI16      Helv.Phys.Acta 36, 693 (1963)

W.R.Gibbs, W.E.Gruebler

Reaction N14(d, n)O15 (5.20; 5.25 and 6.15 Mev)

NUCLEAR STRUCTURE 14N; measured not abstracted; deduced nuclear properties.


1962GR31      Helv.Phys.Acta 35, 548 (1962)

W.Gruebler, W.R.Gibbs

Winkelkorrelationsmessungen der Stripping-Reaktion Ne20(d, nγ) Na21

NUCLEAR STRUCTURE 21Na, 20Ne; measured not abstracted; deduced nuclear properties.


1961GI04      Phys.Rev. 124, 1496 (1961)

W.R.Gibbs, W.Tobocman

Distortion Effects in Deuteron Stripping Reactions with Low Q Values

NUCLEAR STRUCTURE 12C; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.124.1496
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