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janecool

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function racah(j1,m1,j2,m2,j,m)
m1+m2==m

term1=sqrt(((2*j+1)*factorial(j1+j2-j)*factorial(j1+m1)*factorial...
(j2+m2)*factorial(j1-m1)*factorial(j2-m2)*factorial(j+m)...
*factorial(j-m)*factorial(j+j2-j1)*factorial(j+j1-j2))...
/factorial(j+j1+j2+1))

term2=0
n=0
while(j1+j2-j-z>0 &j1-m1-z>0 &j2+m2-z>0 &j-j2+m1+z>0 &j-j1+m2+z>0)
n=n+1
end
for z=0:n
   
    term2=term2+(-1)^z/(factorial(z)*factorial(j1+j2-j-z)*...
        factorial(j1-m1-z)*factorial(j2+m2-z)*...
        factorial(j-j2+m1+z)*factorial(j-j1+m2+z))
end
racah=term1*term2

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[ Last edited by janecool on 2010-9-14 at 19:11 ]
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