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

and r t (t) . is the corresponding local wave number and turning
point, respectively. Since Vpol(r) is of a long range and
acts in the interval r t (t) < r we may replace k i (r) and
r t (I) by their Coulombforms.
The stationary phase evaluation of the nearside
amplitude f N (0) then yields
Vl
+ (9-) _ ± 7 . I_____i_. exppis(1,)—t
N kArd;;;;i57 _. 1 I piod I .
[la k c ( r)
S 1 LuVp..t e " 1
-II 7 1,' 1
I:
4r1
At sub-barrier energies, 0 (N i ) may be considered
predominantly Coulomb with a small correction arising from'
poi ( r) ,
cpx, = d (x)
ILA E 6
where „: ±a. 6
then reads
fr=av cr)citi
— /1, p.t
Re V
(19)
(20)
Our one-stationary-phase-point approximation for
do
o5 ,
=
.117
AL.9 I de
.21 r
r_
00
f vpoi , 09 cirj
L -fit kc Cr) (21)
125