Electron scattering from {sup 10}B
- Department of Physics and Astronomy, University of Massachusetts, Amherst, Massachusetts 01003 (United States)
- National Institute for Nuclear Physics and High-Energy Physics, Section K, Amsterdam (Netherlands)
- Department of Physics, Osaka University, Toyonaka, Osaka 560 (Japan)
Electron scattering measurements have been made in order to determine the longitudinal and transverse form factors of low-lying level in {sup 10}B. With the exception of the broad 5.18 MeV level, results were obtained for all known levels up to 6.7 MeV. The measurements span the momentum transfer range. The primary objective of this work was to improve the data on the pure isovector {ital M}3 form factor of the 1.740 MeV excitation, the transform of which yields the 1{ital p}{sub 3/2} single-nucleon wave function. A Woods-Saxon potential was found to provide a much better representation of the data than the harmonic oscillator model, and the rms size of this orbit was determined to be 2.79{plus_minus}0.11 fm in the relative core-particle coordinate frame. Nevertheless, confidence in the quantitative details of this interpretation is hindered by conflicting evidence regarding the contribution of core polarization. Our analysis of the Coulomb elastic form factor gave an rms radius for the ground-state charge distribution equal to 2.58{plus_minus}0.05{plus_minus}0.05 fm, slightly larger than values previously published. Longitudinal and transverse form factors deduced for inelastic transitions were compared with theoretical results of conventional 1{ital p}-shell models, models with 1{h_bar}{omega} and 2{h_bar}{omega} configurations involving the 1{ital s}, 2{ital s}1{ital d}, and 2{ital p}1{ital f} shells, and finally, a model that included core polarization. Although restricted 1{ital p}-shell models were found to provide good predictions for the {sup 10}B natural-parity level spectrum and transverse form factors, they were less successful for {ital C}2 form factors: not only is there a considerable dependence on the 1{ital p}-shell interaction, but these models give just 45% of the total observed {ital C}2 transition strength. Only a 10% improvement was realized by expanding the shell model space to include 2{h_bar}{omega} configurations.
- OSTI ID:
- 57916
- Journal Information:
- Physical Review, C, Vol. 51, Issue 5; Other Information: PBD: May 1995
- Country of Publication:
- United States
- Language:
- English
Similar Records
Elastic magnetic electron scattering from sup 41 Ca
Polarized and unpolarized neutron-scattering study of the dynamical spin susceptibility of YBa{sub 2}Cu{sub 3}O{sub 7}