Abstract
Independent isomeric yield ratios of 128Sb, 130Sb, 132, 131Te, 133Te, 132I, 134I, 136I, 135Xe and 138Cs have been determined in the fast neutron induced fission of 237Np and 241Am using radiochemical and gamma spectrometric technique. From the independent isomeric yield ratios, fragment angular momenta (Jrms) have been deduced using spin-dependent statistical model analysis. Comparison of these data with the literature data for even-Z fissioning systems shows the following important features: (i) Angular momenta for fragments with spherical 82n shell and even-Z products are lower compared to the fragments with out the 82n shell and odd-Z products indicating the effect of nuclear structure. (ii) Angular momentum of even-Z products in all the fissioning systems are comparable where as for odd-Z products it is slightly higher in the odd-Z fissioning systems than in the adjacent even-Z fissioning systems. This indicates the role of single particle on fragment angular momentum in odd-Z fissioning systems.
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