Nuclear halo structure from quasielastic charge-exchange reactions
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2005-06-13Metadata
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Arellano Sepúlveda, Hugo
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Nuclear halo structure from quasielastic charge-exchange reactions
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Neutron and proton densities in the nuclear periphery are investigated within (p,n) charge-exchange isobar transitions. For this purpose we have developed parameter-free optical potentials (1)) with a detailed treatment of the in-medium t tau part of the effective interaction. Non local coupled-channel Lane equations are solved to obtain the scattering observables. The use of conventional proton and neutron densities significantly underestimates Fermi (forward-angle) cross-sections in agreement with findings by various other groups. However, we have found model-independent densities which provide a remarkable improvement in the description of the quasielastic scattering data. The densities obtained are consistent with recent measurements at CERN in studies of the neutron-to-proton halo factor f(r)=Z rho(n)/N rho(p) with antiprotons (2)). These findings provide an alternative way to investigate the nuclear periphery, and may also help to solve the long-standing puzzle of the underestimated Fermi cross section in (p,n) charge-exchange phenomena.
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NUCLEAR PHYSICS A 755: 527C-530C JUN 13 2005
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