Long-range interactions and artificial poles
Stott, JO, Thompson, IJ and Tostevin, JA (1999) Long-range interactions and artificial poles J PHYS G NUCL PARTIC, 25 (11). 2189 - 2195. ISSN 0954-3899
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The structure of the three-body continuum of the 6He nucleus within the hyperspherical harmonic calculation scheme has been the subject of extensive study. An approximate treatment of the long-range couplings inherent in such models gives rise to unphysical poles in the deduced S-matrix at complex energies. We consider here a simple two-channel example, which includes long-range interactions, and demonstrates the existence of these artificial S-matrix poles. This is also illustrated in a physical context by considering the extreme adiabatic approximation of the hyperspherical harmonics technique for 6He. A correct treatment of the long-range (1/) behaviour of the channel potentials is shown to remove the artificial poles from the physically significant region of the complex energy plane.
|Additional Information:||Copyright 1999 Institute of Physics. This is the author's accepted manuscript.|
|Uncontrolled Keywords:||HALO NUCLEI, HE-6|
|Divisions:||Faculty of Engineering and Physical Sciences > Physics|
|Depositing User:||Symplectic Elements|
|Date Deposited:||05 Dec 2011 13:09|
|Last Modified:||23 Sep 2013 18:49|
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