Large-aperture system for high-resolution 180° electron scattering

Lüttge, C.; Hofmann, Christian; Horn, J.; Neumeyer, F.; Richter, A.; Schrieder, G.; Spamer, E.; Stiller, A.; Sober, D. I.; Matthews, S. K.; Fagg, L.W.

doi:10.1016/0168-9002(95)00497-1

Cited by 28 publications

(6 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A particularly interesting technique for the study of even-mass nuclei is electron scattering at 180 • (Fagg, 1975) because of the dramatic suppression of the background due to the radiative tail of elastic scattering. If combined with a large-acceptance spectrometer it represent a powerful tool for the study of the M 1 response (Lüttge et al, 1995(Lüttge et al, , 1996b. Data from (γ, γ ′ ) in lighter nuclei are limited.…”

Section: Magnetic Dipole Excitations In Light and Medium-heavy Nuclei...mentioning

confidence: 99%

Magnetic dipole excitations in nuclei: Elementary modes of nucleonic motion

2010

View full text Add to dashboard Cite

The nucleus is one of the most multi-faceted many-body systems in the universe. It exhibits a multitude of responses depending on the way one 'probes' it. With increasing technical advancements of beams at the various accelerators and of detection systems the nucleus has, over and over again, surprised us by expressing always new ways of 'organized' structures and layers of complexity. Nuclear magnetism is one of those fascinating faces of the atomic nucleus we discuss in the present review. We shall not just limit ourselves to presenting the by now very large data set that has been obtained in the last two decades using various probes, electromagnetic and hadronic alike and that presents ample evidence for a low-lying orbital scissors mode around 3 MeV, albeit fragmented over an energy interval of the order of 1.5 MeV, and higher-lying spin-flip strength in the energy region 5 − 9 MeV in deformed nuclei, nor to the presently discovered evidence for low-lying proton-neutron isovector quadrupole excitations in spherical nuclei. To the contrary, we put the experimental evidence in the perspectives of understanding the atomic nucleus and its various structures of well-organized modes of motion and thus enlarge our discussion to more general fermion and bosonic many-body systems.

show abstract

Section: Magnetic Dipole Excitations In Light and Medium-heavy Nuclei...mentioning

confidence: 99%

Magnetic dipole excitations in nuclei: Elementary modes of nucleonic motion

2010

View full text Add to dashboard Cite

show abstract

“…Beyond the application to electric and magnetic quadrupole modes discussed so far, new facilities allowing for high-resolution 0 • scattering experiments of hadronic beams [11,48] promise data for ∆L = 0 and 1 natural-parity modes from α scattering [49,50] and proton scattering [51], respectively. Unnatural-parity states can be studied in backward-angle electron scattering [44,52] and charge-exchange reactions [9,53]. Systematic studies of spin-and parity-resolved level densities along these lines are in progress.…”

Section: Discussionmentioning

confidence: 99%

Level density of 2+ states in 40Ca from high energy-resolution (p,p') experiments

Usman,

Buthelezi,

Carter

et al. 2011

Preprint

Self Cite

View full text Add to dashboard Cite

The level density of 2 + states in 40 Ca has been extracted in the energy region of the isoscalar giant quadrupole resonance (ISGQR) from a fluctuation analysis of high energy-resolution (p, p ′ ) data taken at incident energies of 200 MeV at the K600 magnetic spectrometer of iThemba LABS, South Africa. Quasi-free scattering cross sections were calculated to estimate their role as a background contribution to the spectra and found to be small. The shape of the background was determined from the discrete wavelet transform of the spectra using a biorthogonal wavelet function normalized at the lowest particle separation threshold. The experimental results are compared to widely used phenomenological and microscopic models.

show abstract

“…This can be done with the help of a magnetic spectrometer in order to suppress background radiation, see figure 4(a) [44]. For high-resolution 180 • measurements the S-DALINAC is equipped with the powerful QClam spectrometer [45]. In order to measure at several angles simultaneously a movable detector or an array of detectors is favorable.…”

Section: Experimental Determination Of the Sherman Functionmentioning

confidence: 99%

The Sherman function in highly relativistic elastic electron–atom scattering

Jakubaßa-Amundsen¹,

Barday²

2012

J. Phys. G: Nucl. Part. Phys.

View full text Add to dashboard Cite

The Sherman function, which is a measure of the spin asymmetry in the elastic scattering of transversely polarized electrons from heavy targets, is calculated within the relativistic partial-wave representation. For collision energies above 40 MeV, oscillations of the Sherman function develop at the backward scattering angles which mirror the influence of the nuclear potential and which scale inversely with the nuclear size. We give predictions for 20-200 MeV electrons colliding with 64 Zn, 208 Pb and 238 U. We propose the measurement of the diffraction structures in the angular distribution of the Sherman function for a 208 Pb target at a beam energy near 80 MeV. The feasibility of such an experiment is addressed.

show abstract

Large-aperture system for high-resolution 180° electron scattering

Cited by 28 publications

References 15 publications

Magnetic dipole excitations in nuclei: Elementary modes of nucleonic motion

Magnetic dipole excitations in nuclei: Elementary modes of nucleonic motion

Level density of 2+ states in 40Ca from high energy-resolution (p,p') experiments

The Sherman function in highly relativistic elastic electron–atom scattering

Contact Info

Product

Resources

About