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With the aim of investigating the influence of fragment nuclear structure e.g. shell closure configuration and odd-even nature on the scission configuration, fragment angular momenta have been deduced from the radiochemically determined independent isomeric yield ratios of the fission products ltlPd, 131Te, 133Te, 134I and 13SCs in 252Cf spontaneous fission. The fragments' angular momenta deduced are 8.8_+1.5, 5.8 _+ 1.0, 6.1 _+ 1.1, 11.5 _+ 1.1 and 9.8 __ 1.2h respectively. The angular momenta data from this work and literature have been analysed to arrive at fragments' deformations at the scission bringing out the influence of the spherical 82n and deformed 66n and 88n shells. The fragment angular momenta were also seen to be inversely correlated to their elemental yields exhibiting odd-even fluctuations. This has been explained in terms of equilibration of the collective degrees of freedom in low energy fission.

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In the present work the influence of initial excitation energy and angular momentum of the fissioning system on the angular momenta of fission fragments corresponding to ' 'Te and ' Te was studied in the Th(a3OM, v, f) system. The fragment angular momenta were estimated from the radiochemically determined independent isomeric yield ratios using a statistical model. The obtained data are discussed along with the literature data on the fragment angular momenta in the same fissioning nucleus 23 U formed in the U(n, h, f) and " Th(a, f}systems.NUCLEAR REACTIONS~~Th(a3O M v f) reaction, fragment angular momentum, independent isomeric yield ratio, initial excitation energy, angular momentum, single particle effect.

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