The form factor of the two-nucleon stripping process **4**0Ca(t,p)**4**2Ca is studied using two types of effective interactions, namely the Skyrme and Brink-Boeker interactions. The results are compared with those of the ordinary zero-range potential. It is found that the effective interactions reduce the importance of the nuclear internal region. In addition the form factors calculated with effective interactions differ from the zero-range form factor in both the surface and asymptotic regions.
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