Pionic 3d → 2p X-ray measurements in 50,52,54Cr, 45Sc, 51V, 55Mn and Fe |
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| Authors: | R Kunselman RJ Powers MV Hoehn EB Shera |
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| Institution: | Physics Department, University of Wyoming, Laramie, Wyoming 82071, USA;Physics Department, California Institute of Technology, Pasadena, California 91125, USA;Los Alamos National Laboratory, University of California, Los Alamos, New Mexico 87545, USA |
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| Abstract: | We report the measurement of the strong interaction shifts and widths of the pionic 3d → 2p transitions in separated isotopes of 50,52,54Cr and natural Sc, V, Mn, and Fe. Using these new data in combination with earlier low-Z pionic data (6 ? Z ? 20) we have studied the phenomenological pion-nuclear potential. Employing nuclear structure information from measured charge densities and Hartree-Fock calculations, we have fitted the pion-nuclear potential parameters to the pionic-atom data. We have explored the sensitivity of these data to the value of the Lorentz-Lorenz parameter ξ. The addition of an isovector dependence to the s- and p-wave two-nucleon terms is shown to be unnecessary at the present level of experimental accuracy. We have used the deduced optical potentials to determine the neutron radii of the nuclei 20 ? Z ? 26 and find reasonable agreement with Hartree-Fock predictions and with the results of other hadronic probes for 20 ? Z ? 23 but poor agreement for 24 ? Z ? 26. |
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