NSR Query Results
Output year order : Descending NSR database version of March 21, 2024. Search: Author = W.Knupfer Found 42 matches. 1987KI06 Z.Phys. A326, 41 (1987) G.Kilgus, G.Kuhner, S.Muller, A.Richter, W.Knupfer Isoscalar Quadrupole Giant Resonance in 208Pb: A statistical analysis of high-resolution inelastic electron scattering spectra NUCLEAR REACTIONS 208Pb(e, e'), E=50 MeV; measured spectra, σ(θ). 208Pb deduced level densities, GQR characteristics, E2 strength functions. Fluctuation analysis.
1986KN05 Nucl.Phys. A457, 292 (1986) W.Knupfer, W.Muller, B.C.Metsch, A.Richter Consistent Empirical Description of Magnetic Moments and M1 Transitions - Quenching of the Diagonal and Off-Diagonal Spin Matrix Elements - NUCLEAR STRUCTURE A < 100; 208Pb; calculated B(M1); deduced spin matrix element quenching. Shell model.
doi: 10.1016/0375-9474(86)90379-9
1985KN01 Z.Phys. A320, 253 (1985) On the Scaling of the Paramagnetic Susceptibility of Atoms, Nuclei and Nucleons NUCLEAR STRUCTURE A=2-200; compiled paramagnetic susceptibility; deduced corresponding Fermi energy scaling with nucleons, atoms. Magnetic dipole transition input.
1985SO05 Phys.Rev. C31, 2054 (1985) D.I.Sober, B.C.Metsch, W.Knupfer, G.Eulenberg, G.Kuchler, A.Richter, E.Spamer, W.Steffen Magnetic Dipole Excitations in the N = 28 Isotones 50Ti, 52Cr, and 54Fe NUCLEAR REACTIONS 50Ti, 52Cr, 54Fe(e, e'), E=30-57 MeV; measured σ(θ), σ(E(e')). 50Ti, 52Cr, 54Fe levels deduced B(λ), transition radius, M1 total strength, fragmentation. Shell model calculations.
doi: 10.1103/PhysRevC.31.2054
1984KN03 J.Phys.(Paris), Colloq.C4, 513 (1984); See 1984Kn04 Many-Particle Many-Hole Excitations and the Retardation of Magnetic Dipole and GT Transition-Strengths
1984KN04 J.Phys.(Paris), Colloq.C-4, 513 (1984) Many-Particle Many-Hole Excitations and the Retardation of Magnetic Dipole and GT Transition-Strengths NUCLEAR STRUCTURE 90Zr; calculated level density, Gamow-Teller transition strength distributions. A ≤ 210; calculated B(M1), μ; deduced spin, tensor corrections.
1984MU25 Nucl.Phys. A430, 61 (1984) W.Muller, B.C.Metsch, W.Knupfer, A.Richter Calculation of the β+ Decay of Proton-Rich sd-Shell Nuclei into a Gamow-Teller Resonance RADIOACTIVITY 32,33Ar, 36Ca(β+); calculated β+ strength function; deduced Gamow-Teller resonance, J, π. Shell Model.
doi: 10.1016/0375-9474(84)90192-1
1983BE11 Nucl.Phys. A398, 408 (1983) D.Bender, G.Eulenberg, A.Richter, E.Spamer, B.C.Metsch, W.Knupfer Search for M1 Strength in 51V and the Difference in 51V(e, e') and 51V(p, p') Spectra NUCLEAR REACTIONS 51V(e, e'), E=38-57 MeV; measured σ(E, θ). 51V deduced B(M1).
doi: 10.1016/0375-9474(83)90292-0
1983BE36 Nucl.Phys. A406, 504 (1983) D.Bender, A.Richter, E.Spamer, E.J.Ansaldo, C.Rangacharyulu, W.Knupfer High-Resolution (e, e') Study of Isovector M1 and M2 Transitions in the Oxygen Isotopes (III). 18O NUCLEAR REACTIONS 18O(e, e'), E=30-60 MeV; measured σ(E, θ). 18O levels deduced tentative J, π, B(M1), B(M2) at photon point. Shell-model calculations. Enriched isotope gas target.
doi: 10.1016/0375-9474(83)90373-1
1983DI13 Nuovo Cim. 76A, 433 (1983) Virtual Δ-Isobar Admixture in Nuclei NUCLEAR REACTIONS 12C(p, π-), E=605 MeV; calculated σ(θ); deduced baryon resonance, real virtual Δ-isobar amplitude roles. Plane, distorted wave models.
doi: 10.1007/BF02833739
1983KN02 Phys.Lett. 122B, 7 (1983) W.Knupfer, M.Dillig, A.Richter Magnetic Dipole Spin-Flip Excitations in Complex Nuclei and the Virtual Δ-Isobar Admixture Amplitude in J(π) = 1+ States NUCLEAR STRUCTURE 48Ca, 90Zr, 208Pb; calculated isobar-hole component in spin-flip excitation. Two-state, meson exchange models.
doi: 10.1016/0370-2693(83)91157-7
1983KN05 Phys.Rev. C27, 2487 (1983) Importance of the Orbital Magnetization for Isovector M1 Transitions of Nuclei in the sd Shell NUCLEAR STRUCTURE 20Ne, 28Si, 32S; calculated B(M1) strength distribution. Isovector transitions, shell model. NUCLEAR REACTIONS 20Ne(e, e'), E not given; 20Ne(π-, γ), E at rest; 20Ne(p, n), E=135 MeV; calculated B(M1) transition strength distribution, radiative pion capture, σ(p, n); deduced orbital magnetization effect. Shell model.
doi: 10.1103/PhysRevC.27.2487
1983KN08 Phys.Lett. 129B, 375 (1983) W.Knupfer, B.C.Metsch, A.Richter Proton Correlations and the Missing M1 Strength in 48Ca: A two-state model NUCLEAR STRUCTURE 48Ca; calculated B(M1); deduced proton correlation. Two-state shell model.
doi: 10.1016/0370-2693(83)90122-3
1983KU14 Nucl.Phys. A406, 473 (1983) G.Kuchler, A.Richter, E.Spamer, W.Steffen, W.Knupfer High-Resolution (e, e') Study of Isovector M1 and M2 Transitions in the Oxygen Isotopes (I). 16O NUCLEAR REACTIONS 16O(e, e'), E=30-60 MeV; measured σ(E, θ). 16O levels deduced B(λ) at photon point. Shell-model, RPA calculations. Solid BeO, Be targets.
doi: 10.1016/0375-9474(83)90371-8
1983MU03 Phys.Lett. 120B, 305 (1983) S.Muller, A.Richter, E.Spamer, W.Knupfer, B.C.Metsch Experimental Study of Proton and Neutron Spin-Flip Contributions to the Electroexcitation of the J(π) = 1+ State at E(x) = 5.846 MeV in 208Pb NUCLEAR REACTIONS 208Pb(e, e'), E=23.3, 36.4, 49.8, 61.2 MeV; measured σ(E(e')), σ(θ) vs E; deduced tensor correlation, neutron, proton contribution interference. 208Pb deduced M1 transition isovector character. RPA calculations.
doi: 10.1016/0370-2693(83)90450-1
1982EU01 Phys.Lett. 116B, 113 (1982) G.Eulenberg, D.I.Sober, W.Steffen, H.-D.Graf, G.Kuchler, A.Richter, E.Spamer, B.C.Metsch, W.Knupfer Inelastic Electron Scattering on the N = 28 Isotones 48Ca, 50Ti, 52Cr and 54Fe and the Shape and Magnitude of the M1 Strength Distributions NUCLEAR REACTIONS 48Ca, 50Ti, 52Cr, 54Fe(e, e'), E=30-58 MeV; measured σ(E(e')), σ(θ). 50Ti, 52Cr, 54Fe deduced B(M1) strength distribution. 48Ca deduced total B(M1). Shell model.
doi: 10.1016/0370-2693(82)90987-X
1981GR14 Z.Phys. A302, 165 (1981) E.Grecksch, W.Knupfer, M.Dillig Low Energy Spectrum and Giant Multipole Resonances of 12C (I) NUCLEAR STRUCTURE 12C; calculated levels, B(λ), giant multipole resonance spreading widths. Particle-hole description.
doi: 10.1007/BF01413046
1981GR15 Z.Phys. A302, 247 (1981) E.Grecksch, M.Dillig, W.Knupfer The Low Energy Spectrum of 12C (II). Influence of Virtual Isobar Admixture NUCLEAR STRUCTURE 12C; calculated levels, B(λ). Extended particle-hole model.
doi: 10.1007/BF01415545
1981KN01 Nucl.Phys. A358, 401c (1981) Suppression of the Transverse Electron Scattering Amplitudes of Electric and Magnetic High Spin States in 208Pb NUCLEAR REACTIONS 208Pb(e, e'), E=50-335 MeV; calculated form factors; deduced interference effects from shell model, core polarization, nuclear spin current mesonic renormalization. Large model space, 2p-2h coupling to 1p-1h excitations. NUCLEAR STRUCTURE 208Pb; calculated 2p-2h state density, levels, B(λ) for high spin states. Large model space.
doi: 10.1016/0375-9474(81)90351-1
1981KN02 Nucl.Phys. A358, 405c (1981) W.Knupfer, M.Dillig, A.Richter Quenching of the Nuclear Spin Current NUCLEAR STRUCTURE A=10-220; calculated magnetic moment quenching; deduced meson contribution. Diagrammatic approach, nucleon-hole, Δ-hole state coupling, pion, photon vertex renormalization.
doi: 10.1016/0375-9474(81)90352-3
1981KN06 Phys.Lett. 101B, 375 (1981) On the Paramagnetic and Diamagnetic Susceptibility of Nuclei NUCLEAR STRUCTURE A=6-208; analyzed M1 transition strengths; deduced paramagnetic, diamagnetic susceptibilities.
doi: 10.1016/0370-2693(81)90155-6
1981KN10 Phys.Lett. 107B, 325 (1981) Effect of the Nuclear Magnetic Susceptibility on the Evaluation of the Electric Dipole Polarizability NUCLEAR STRUCTURE 6,7Li, 9Be, 10B, 12,13C, 14N, 16O, 20,22Ne, 24Mg, 27Al, 28Si, 40,42,48Ca, 58Ni, 90Zr, 208Pb; calculated static electric dipolarizability. Photonuclear sum rule, magnetic susceptibility input.
doi: 10.1016/0370-2693(81)90333-6
1981KU14 Phys.Lett. 104B, 189 (1981) G.Kuhner, D.Meuer, S.Muller, A.Richter, E.Spamer, O.Titze, W.Knupfer Electroexcitation of 208Pb, Distribution of Electric Dipole and Quadrupole Strength and Fragmentation of the Isoscalar Quadrupole Giant Resonance NUCLEAR REACTIONS 208Pb(e, e'), E=30, 40, 50 MeV; measured σ(E(e')). 208Pb deduced B(E1), B(E2), electric dipole, T=0, GQR strength fragmentation, EWSR. Low momentum transfer, high resolution.
doi: 10.1016/0370-2693(81)90588-8
1981ME12 Phys.Lett. 106B, 289 (1981) D.Meuer, G.Kuhner, S.Muller, A.Richter, E.Spamer, O.Titze, W.Knupfer Search for M1 and M2 Giant Resonances in 140Ce with High-Resolution Electron Scattering and Comments on a Recent Theoretical Prediction NUCLEAR REACTIONS 140Ce(e, e'), E=40, 46, 50 MeV; measured σ(θ, E(e)). 140Ce deduced levels, 2- state fragmentation, B(M2), no evidence for M1 giant resonance. High resolution.
doi: 10.1016/0370-2693(81)90538-4
1980AN18 Phys.Lett. B95, 31 (1980) E.J.Ansaldo, C.Rangacharyulu, D.Bender, U.Kramer, A.Richter, E.Spamer, W.Knupfer Electroexcitation of Isovector Magnetic Dipole and Quadrupole Transitions in 18O and Their Relation to Radiative Pion Capture. NUCLEAR REACTIONS 18O(e, e'), E=45, 49, 54, 58, 59 MeV; measured σ(E(e')). 18O deduced levels, J, π, isospin, γ-multipolarity, B(λ). Enriched gas target.
doi: 10.1016/0370-2693(80)90392-5
1980KN01 Phys.Lett. B95, 349 (1980) W.Knupfer, M.Dillig, A.Richter Quenching of the Magnetic Multipole Strength Distribution and the Anomalous Magnetic Moment in Complex Nuclei and Mesonic Renormalization of the Nuclear Spin Current NUCLEAR STRUCTURE A=20-220; calculated anomalous μ, B(ML) quenching factors. Mesonic nuclear spin current renormalization.
doi: 10.1016/0370-2693(80)90166-5
1980ME13 Nucl.Phys. A349, 309 (1980) D.Meuer, R.Frey, D.H.H.Hoffmann, A.Richter, E.Spamer, O.Titze, W.Knupfer High Resolution Inelastic Electron Scattering on 90Zr at Low Momentum Transfer and Strong Fragmentation of the Magnetic Quadrupole Strength NUCLEAR REACTIONS 90Zr(e, e'), E=24-66 MeV; measured σ(E, θ). 90Zr deduced levels, transition strengths. Shell model calculations.
doi: 10.1016/0375-9474(80)90290-0
1980ST17 Phys.Lett. B95, 23 (1980) W.Steffen, H.-D.Graf, W.Gross, D.Meuer, A.Richter, E.Spamer, O.Titze, W.Knupfer Backward-Angle High-Resolution Inelastic Electron Scattering on 40,42,44,48Ca and Observation of a Very Strong Magnetic Dipole Ground-State Transition in 48Ca NUCLEAR REACTIONS 40,42,44,48Ca(e, e'), E=39 MeV; 48Ca(e, e'), E=30, 50 MeV; measured σ(E(e')). 40,42,48Ca deduced 1+ state, B(M1). Enriched targets.
doi: 10.1016/0370-2693(80)90390-1
1979GR09 Phys.Lett. 84B, 296 (1979) W.Gross, D.Meuer, A.Richter, E.Spamer, O.Titze, W.Knupfer A Strong Magnetic Dipole Excitation in 40Ca Observed in High-Resolution Inelastic Electron Scattering and Coherent Spin-Flip Transitions Due To Ground-State Correlations NUCLEAR REACTIONS 40Ca(e, e'), E=44, 50 MeV; measured σ(Ee'). 40Ca level deduced strong M1 transition. Coherent spin-flip transitions, ground state correlation interpretation.
doi: 10.1016/0370-2693(79)90043-1
1979SC14 Nucl.Phys. A323, 13 (1979) R.Schneider, A.Richter, A.Schwierczinski, E.Spamer, O.Titze, W.Knupfer High Resolution Inelastic Electron Scattering on 28Si at Low Momentum Transfer and Isovector M1 Strength in 28Si NUCLEAR REACTIONS 28Si(e, e'), E=38.7-57.5 MeV; measured σ(E, θ). 28Si deduced levels, transition probability. Shell-model calculations.
doi: 10.1016/0375-9474(79)90413-5
1978FR06 Phys.Lett. 74B, 45 (1978) R.Frey, A.Richter, A.Schwierczinski, E.Spamer, O.Titze, W.Knupfer High-Resolution Inelastic Electron Scattering on 208Pb at 50 and 63.5 MeV and Fragmentation of the Magnetic Quadrupole Strength NUCLEAR REACTIONS 208Pb(e, e'), E=50, 63.5 MeV; measured σ(θ). 208Pb deduced levels, B(M2).
doi: 10.1016/0370-2693(78)90055-2
1978KN03 Phys.Lett. 77B, 367 (1978) W.Knupfer, R.Frey, A.Friebel, W.Mettner, D.Meuer, A.Richter, E.Spamer, O.Titze Electroexcitation of M2 Giant Resonances, Mass Dependent Quenching of The Spin-Magnetism and the Reduction of M1 Strength in Heavy Nuclei NUCLEAR STRUCTURE 28Si, 90Zr, 208Pb; calculated M2 giant resonance.
doi: 10.1016/0370-2693(78)90579-8
1977GR02 Phys.Rev. C15, 837 (1977) E.Grecksch, W.Knupfer, M.G.Huber Electroexcitation of Collective M1 Resonances in 12C NUCLEAR STRUCTURE 12C; calculated electroexcited M1 resonances.
doi: 10.1103/PhysRevC.15.837
1977KL02 Phys.Rev. C15, 1483 (1977) K.Klingenbeck, W.Knupfer, M.G.Huber, P.W.M.Glaudemans Central and Noncentral Components of the Effective sd-Shell Interaction NUCLEAR STRUCTURE 28Si; calculated levels, tensor effects.
doi: 10.1103/PhysRevC.15.1483
1977KN02 Phys.Lett. 66B, 305 (1977) W.Knupfer, K.Knauss, M.G.Huber Giant Multipole Resonances in an Excited Core Model NUCLEAR STRUCTURE 20,22Ne; calculated giant multipole resonances, parameters.
doi: 10.1016/0370-2693(77)90001-6
1977KN03 Z.Phys. A280, 175 (1977) W.Knupfer, E.Grecksch, M.G.Huber Splitting of the Isovector Giant Quadrupole Resonances in 12C and 16O NUCLEAR STRUCTURE 12C, 16O; calculated splitting of isovector GQR, B(λ).
1976GI12 Nuovo Cim. 36A, 258 (1976) Experimental Studies of Neutron Collectivities by α-Particle Scattering and Some Implications for Giant-Resonance Excitations NUCLEAR REACTIONS 208Pb(α, α), (α, α'), E=104 MeV; analyzed data; calculated σ for GDR in 208Pb.
doi: 10.1007/BF02724579
1976KN02 Z.Phys. A276, 99 (1976) Splitting of the Isoscalar E0 and E2 Giant Multipole Resonances in 16O NUCLEAR STRUCTURE 16O; calculated giant resonance excitation, B(E2).
1976KN06 Phys.Rev. C14, 2254 (1976) Universal Relationship Connecting Various Two-Body Effective Residual Interactions NUCLEAR STRUCTURE 16O; calculated levels, T=1 strength. 88Sr; calculated B(E2), B(E3). 208Pb; calculated excitation, transition strengths. 59,62Ni; calculated levels. 48Ca, 50Ti, 52Cr, 54Fe, 56Ni; calculated quadrupole moment.effective residual interaction.
doi: 10.1103/PhysRevC.14.2254
1976WE27 Phys.Lett. 65B, 189 (1976) E.Weber, W.Knupfer, E.Grecksch, M.G.Huber Electroexcitation of High Spin States in 208Pb NUCLEAR STRUCTURE 208Pb; calculated electroexcitation form factors.
doi: 10.1016/0370-2693(76)90159-3
1975GR33 Lett.Nuovo Cim. 14, 505 (1975) E.Grecksch, W.Knupfer, M.G.Huber Giant Multipole Resonances in 208Pb NUCLEAR STRUCTURE 208Pb; calculated giant resonances, B(λ).
doi: 10.1007/BF02746044
1970KA45 Proc.Intern.Conf.Nucl.Reactions Induced by Heavy Ions, Heidelberg, Germany (1969); R.Bock, W.R.Hering, Eds., North Holland Publishing Co., Amsterdam, p.471 (1970) G.Kaspar, W.Knupfer, W.Ebert, P.Holleczek, N.Fiebiger Determination of the Static Quadrupole Moment of the First Excited 2+ State of 152Sm and 166Er by Coulomb Excitation with 16O-Ions NUCLEAR MOMENTS 152Sm, 166Er levels measured quadrupole moment.
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