Role of Higher Multipole Excitations in the Electromagnetic Dissociation of One Neutron Halo Nuclei

European Physical Journal A (Impact Factor: 2.42). 01/2008; DOI: 10.1140/epja/i2007-10538-7
Source: arXiv

ABSTRACT We investigate the role of higher multipole excitations in the electromagnetic dissociation of one-neutron halo nuclei within two different theoretical models -- a finite range distorted wave Born approximation and another in a more analytical method with a finite range potential. We also show, within a simple picture, how the presence of a weakly bound state affects the breakup cross section.

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    ABSTRACT: Progress in breakup reaction theories, like the distorted wave Born approximation, the continuum discretized coupled channels method and the dynamical eikonal approximation, is brought into focus. The need to calculate exclusive reaction observables and the utility of benchmark tests as arbitrators of theoretical models are discussed. KeywordsBreakup theories-post and prior forms-distorted wave Born approximation-continuum discretized coupled channels-dynamical eikonal
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    ABSTRACT: Essential properties of halo nuclei can be described in terms of a few low-energy constants. For neutron halo nuclei, analytical results can be found for wave functions and electromagnetic transition matrix-elements in simple but well-adapted models. These wave functions can be used to study nuclear reactions; an especially simple and instructive example is Coulomb excitation. A systematic expansion in terms of small parameters can be given. We present scaling laws for excitation amplitudes and cross sections. The results can be used to analyze experiments like ${}^{11}$Be Coulomb excitation. They also serve as benchmark tests for more involved reaction theories.
    European Physical Journal A 09/2008; · 2.42 Impact Factor

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