VI Reunião de Trabalho Física Nuclear.pdf - Sociedade Brasileira ...

and T' is given by
-r v c."-)7-- (3)
and thus contributes to the transition. (V is assumed to be
non-diagonal in channel space).
The elastic element of T may be generated perturbative
V4; V,(2.
s-2 a V 4 (#) v j 64-)1/nt#)
The second term corresponds to the diagram shown in Fig.(3a,b).
In order to exhibit the general characteristics of
the contributing processes, we shall present a simple evaluation
of these corrections based on the following approximations" (5)
1) Consider only the on-shell part of 8 G t --1.116(E t -H t )
2) Use no-recoil.
The partial wave amplitude corresponding to a process
of order n is then given by (ignoring angular momentum
transfer)
2)71.1 I
(*Yr) Tr 1-‹ (x ?7- —17r
; mr-rr / j
=
ntl
(k.t ,t() Tr (11.]
I 1- ,
113
; IF—e)AL
(4)
( 5)