Systematics of nuclear charge distributions in the mass 60 region from elastic electron scattering and muonic x-ray measurements
Precise ratios of elastic electron scattering cross sections for the nuclei /sup 54,56,58/Fe, /sup 58,60,62,64/Ni, and /sup 64,66,68,70/Zn have been measured in the momentum-transfer region 0.6 fm/sup -1/ < or = q < or = 2.3 fm/sup -1/. The data were analyzed with a Fourier-Bessel parametrization of the charge distribution. Charge distribution differences were determined nearly model independently for the ..delta..A=2 isotope and isotone pairs. The ..delta..Z=2 isotone charge distribution differences show a strong shell effect. For the ..delta..N=2 isotopes we observe a nearly constant increase of the ''half density radius'' in the investigated region of the 2p/sub 3/2/, 1f/sub 5/2/, and 2p/sub 1/2/ neutron shells. However, the skin thickness of the charge distribution increases strongly at the beginning (/sup 56/Fe-/sup 54/Fe) and decreases at the end (/sup 70/Zn-/sup 68/Zn) of these shells by adding two neutrons. The rms radii differences deduced from a combined analysis of the electron scattering data and present muonic x-ray data show the same trend. These differences, determined model independently with a typical accuracy of some 10/sup -3/ fm, decrease nearly linearly with increasing neutron number in the investigated region 28 < or = N < or = 40. These isotope shifts are nearly independent of the proton configuration of the involved nuclei, hence, that the added neutrons interact primarily with the proton core rather than with the valence protons. A comparison of the experimental charge distribution differences with results of density dependent Hartree-Fock calculations indicates the importance of deformation changes. The core rearrangement due to added protons, deduced from the measured isotone charge distribution differences, and the core rearrangements due to added neutrons, directly measured by the isotope shifts, are similar. Core polarizations result in a smaller charge core radius.
- Research Organization:
- Institut fuer Kernphysik der Johannes Gutenberg-Universitaet, D-6500 Mainz, Germany
- OSTI ID:
- 5363856
- Journal Information:
- Phys. Rev., C; (United States), Vol. 22:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ELECTRON REACTIONS
ELASTIC SCATTERING
IRON ISOTOPES
CHARGE DISTRIBUTION
NICKEL ISOTOPES
ZINC ISOTOPES
DIFFERENTIAL CROSS SECTIONS
HARTREE-FOCK METHOD
MEV RANGE 100-1000
MUONS
NUCLEAR DEFORMATION
NUCLEAR RADII
PHASE SHIFT
SHELL MODELS
X-RAY SPECTRA
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DEFORMATION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
LEPTON REACTIONS
LEPTONS
MATHEMATICAL MODELS
MEV RANGE
NUCLEAR MODELS
NUCLEAR PROPERTIES
NUCLEAR REACTIONS
SCATTERING
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