Summary
Equations which connect the energies and angular momenta of bound states with appropriate integrals over the bound-state wave functions are obtained applying a modified Wronskian-type technique to the radial Schrödinger equation. From these equations simple restrictions on the energies and angular momenta of bound states are derived. A remarkably simple result is the following upper limit for the angular momentum of bound states in the potentialV(r):ℏ 2 l(l+1)<2m Max [½r 3dV(r)/dr] The results which obtain applying these techniques to Regge poles are also analysed.
Riassunto
Applicando una versione modificata del teorema del Wronskiano alla equazione radiale di Schrödinger si ottengono delle relazioni che connettono le energie e i momenti angolari di stati legati ad opportuni integrali delle funzioni d'onda radiali. Da tali relazioni si ottengono semplici restrizioni sulle energie e i momenti angolari degli stati legati. Notevole per la sua semplicità è il seguente limite superiore al momento angolare degli stati legati del potenzialeV(r):ℏ 2 l(l+1)<2m Max [½r 3dV(r)/dr]. Si discutono inoltre i risultati che si ottengono applicando siffatte tecniche al caso dei poli di Regge.
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References
D. M. Fradkin andF. Calogero:Nucl. Phys.,75, 475 (1965), hereafter referred to as FC.
This theorem is obtained settingl 1=l 2=l,E 1=E 2 in eq. (2.13), (thus it is already implied by the equation given in FC, and we refer to the discussion given there for its semiclassical interpretation); for regular potentials it refers only to positive values ofl.
For an analogous result concerning the total number of bound states with given angular momentum see ref. (5).
F. Calogero:Commun. Math. Phys.,1, 80 (1965). See alsoF. Calogero:Variable-Phase Approach to Scattering Theory, to be published by Academic press, New York.
V. Bargmann:Proc. Acad. Sci. U.S.A.,38, 961 (1952);J. Schwinger:Proc. Acad. Sci. U.S.A.,47, 122 (1961).
See, for instance:R. C. Newton:The Complex j-Plane (New York, 1964);V. De Alfaro andT. Regge:Potential Scattering (Amsterdam, 1965).
It may be useful to note that Im [l(l+1)]=2 Re λ Im λ, with λ=l+1/2.
These definitions are suggested by dimensional reasons. Note that the radial wave functions are normalized through the asymptotic condition eq. (3.2).
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Calogero, F., Cosenza, G. Properties of bound states and Regge poles derivable from modified Wronskian relations. Nuovo Cimento A (1965-1970) 45, 867–881 (1966). https://doi.org/10.1007/BF02738374
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DOI: https://doi.org/10.1007/BF02738374