Research PapersNo Access

UNIFIED ALGEBRAIC TREATMENT OF RESONANCE

A. D. ALHAIDARI

Physics Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia

https://doi.org/10.1142/S0217751X05021154Cited by:12 (Source: Crossref)

Abstract

Energy resonance in scattering is usually investigated either directly in the complex energy plane (E-plane) or indirectly in the complex angular momentum plane (ℓ-plane). Another formulation complementing these two approaches was introduced recently. It is an indirect algebraic method that studies resonances in a complex charge plane (Z-plane). This latter approach will be generalized to provide a unified algebraic treatment of resonances in the complex E-, ℓ-, and Z-planes. The complex scaling (rotation) method will be used in the development of this approach. The resolvent operators (Green's functions) are formally defined in these three spaces. Bound states spectrum and resonance energies in the E-plane are mapped onto a discrete set of poles of the respective resolvent operator on the real line of the ℓ- and Z-planes. These poles move along trajectories as the energy is varied. A finite L² basis is used in the numerical implementation of this approach. Stability of poles and trajectories against variation in all computational parameters is demonstrated. Resonance energies for a given potential are calculated and compared with those obtained by other studies.

Keywords:

PACS: 03.65.Nk, 03.65.Ca, 03.65.Fd, 02.30.Tb

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