A variational principle for scattering phase shifts

1963 ◽  
Vol 27 (4) ◽  
pp. 947-951 ◽  
Author(s):  
F. Calogero
1963 ◽  
Vol 16 (2) ◽  
pp. 177 ◽  
Author(s):  
P Swan

The distorted wave approximation for tan ?l involves a wave function distorted from its asymptotic form at r � 8 by a form factor g1(r). Schwinger's variational principle is adapted to show that increasing the number of variable parameters in g1(r) does not necessarily improve the firs


1995 ◽  
Vol 448 (1-2) ◽  
pp. 277-292 ◽  
Author(s):  
Antal Jevicki ◽  
Miao Li ◽  
Tamiaki Yoneya

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