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Search: Author = W.Knupfer

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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
Citations: PlumX Metrics

1985KN01      Z.Phys. A320, 253 (1985)

W.Knupfer, A.Richter

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
Citations: PlumX Metrics

1984KN03      J.Phys.(Paris), Colloq.C4, 513 (1984); See 1984Kn04

W.Knupfer, B.C.Metsch

Many-Particle Many-Hole Excitations and the Retardation of Magnetic Dipole and GT Transition-Strengths

1984KN04      J.Phys.(Paris), Colloq.C-4, 513 (1984)

W.Knupfer, B.C.Metsch

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

1983DI13      Nuovo Cim. 76A, 433 (1983)

M.Dillig, W.Knupfer

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

1983KN05      Phys.Rev. C27, 2487 (1983)

W.Knupfer, B.C.Metsch

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

1981KN01      Nucl.Phys. A358, 401c (1981)

W.Knupfer, G.Bosader

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

1981KN06      Phys.Lett. 101B, 375 (1981)

W.Knupfer, A.Richter

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
Citations: PlumX Metrics

1981KN10      Phys.Lett. 107B, 325 (1981)

W.Knupfer, A.Richter

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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)

H.J.Gils, H.Rebel, W.Knupfer

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
Citations: PlumX Metrics

1976KN02      Z.Phys. A276, 99 (1976)

W.Knupfer, M.G.Huber

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)

W.Knupfer, M.G.Huber

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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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