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Showing papers by "Achim Richter published in 1978"

Journal Article•DOI•
Electroexcitation of M2 giant resonances, mass dependent quenching of the spin-magnetism and the reduction of M1 strength in heavy nuclei

[...]

W. Knüpfer1, R. Frey2, A. Friebel2, W. Mettner2, D. Meuer2, Achim Richter2, E. Spamer2, O. Titze2 •
University of Erlangen-Nuremberg1, Darmstadt University of Applied Sciences2
28 Aug 1978-Physics Letters B
TL;DR: The location of the M2 giant resonance in 28Si, 90Zr and 208Pb, predicted within the framework of the MSI-RPA particle-hole model, has been confirmed by high-resolution inelastic electron scattering (E X ≈ 44A − 1 3 MeV ).

60 citations

Journal Article•DOI•
Z and E dependence and scaling behaviour of the K-shell ionization cross section for relativistic electron impact☆

[...]

D. H. H. Hoffmann1, Harald Genz1, W. Löw1, Achim Richter1•
Darmstadt University of Applied Sciences1
20 Mar 1978-Physics Letters A
TL;DR: In this paper, the K-shell ionization cross sections have been measured for atoms 18 ⩽ Z − 83 bombarded by relativistic electrons (15 − E 0 − 65 MeV).

29 citations

Journal Article•DOI•
High-resolution inelastic electron scattering on 208 Pb at 50 and 63.5 MeV and fragmentation of the magnetic quadrupole strength

[...]

R. Frey1, Achim Richter1, A. Schwierczinski1, E. Spamer1, O. Titze1, W. Knüpfer2 •
Darmstadt University of Applied Sciences1, University of Erlangen-Nuremberg2
27 Mar 1978-Physics Letters B
TL;DR: In this paper, high-resolution inelastic electron scattering (FWHM ≈ 33 keV) with 50 MeV and 63.5 MeV electrons on 208 Pb has been used to study magnetic excitations between E x =6 MEV and 8 MEV.

26 citations

Journal Article•DOI•
Study of electric monopole transitions between the ground state and the first excited 0+ state in 40, 42, 44, 48Ca with high resolution inelastic electron scattering

[...]

Hans-Dieter Gräf1, Hans Feldmeier1, P. Manakos1, Achim Richter1, E. Spamer1, D. Strottman2 •
Darmstadt University of Applied Sciences1, Stony Brook University2
30 Jan 1978-Nuclear Physics
TL;DR: In this article, high resolution inelastic electron scattering (FWHM ≈ 30 keV) at low momentum transfer (0.29 ≦ q ≦ 0.53 fm −1 ) was used to estimate the number of particle-hole excitations in the wave functions of the excited 0 + states.

23 citations

Journal Article•DOI•
Inelastic electron scattering, radiative width and magnetization density of the 2+, T = 1 state at 16.11 MeV in 12C

[...]

A. Friebel1, P. Manakos1, Achim Richter1, E. Spamer1, W. Stock1, O. Titze1 •
Darmstadt University of Applied Sciences1
02 Jan 1978-Nuclear Physics
TL;DR: In this article, the electroexcitation of the 2+, T = 1 state at 16.11 MeV in 12C has been investigated for momentum transfers q < 0.5 fm−1.

16 citations

Journal Article•DOI•
Allowed β-transitions, weak magnetism and nuclear structure in light nuclei

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H. Behrens, H. Genz1, M Conze1, Hans Feldmeier1, W Stock1, Achim Richter1 •
Darmstadt University of Applied Sciences1
01 Oct 1978-Annals of Physics
TL;DR: In this article, the general formalism for allowed β-transitions is derived in the framework of the elementary particle as well as in the impulse approximation treatment, and explicit expressions for the shape factor, the asymmetry and anisotropy of electrons emitted from oriented nuclei, the β-γ (CP) correlation and the βγ angular correlation are given.

14 citations

Journal Article•DOI•
Correlations between mirror channels and isospin mixing in compound nucleus reactions

[...]

Hans A. Weidenmüller1, Achim Richter2, Hanns Ludwig Harney•
University of Oxford1, Darmstadt University of Applied Sciences2
01 Nov 1978-Physical Review C
TL;DR: In this paper, it was shown that the size of external isospin mixing depends upon the correlations between mirror channels, and that in the limit of vanishing charge, these correlations yield zero external mixing.
Abstract: It is shown that the size of external isospin mixing depends upon the correlations between mirror channels. In the limit of vanishing charge, these correlations yield zero external mixing. For the actual strength of the Coulomb field, our analysis corroborates the estimates of external mixing given earlier. We present formulas for cross-section correlations between mirror channels.

1 citations