Fusion probability for neutron-rich radioactive Sn induced reactions

Evaporation residue cross sections for 124,126,127,128Sn + 64Ni and 132Sn + 58Ni have been measured to study the effects of neutron excess in neutron-rich radioactive nuclei on fusion. For the reactions with 64Ni, the fusion probability does not decrease with increasing neutron excess in Sn, contrary to the result of the stable beam Sn+Zr measurement. A comparison of the reduced evaporation residue cross sections for 126Sn + 64Ni and 132Sn + 58Ni, which make the same compound nucleus, shows that the fusion probability is indistinguishable for reactions involving the same atomic elements but different isotope combinations.