Independent isomeric yield ratios of fission products in the epi-cadmium neutron induced fission of 239 Pu

초록

Measurement of independent isomeric yield ratios (IR) of Sb-128,Sb-130,Sb-132, Te-131,Te-133, I-132.134,I-136, Xe-135 and Cs-138 have been carried out for the first time in the epi-cadmium neutron induced fission of Pu-239 by using an off-line gamma-ray spectrometric technique. The average neutron energy (<E-n>) of the epi-cadmium reactor neutron spectrum is 1.9 MeV. From the IR values, root mean square fragment angular momenta (J(RMS)) were deduced by using spin dependent statistical model analysis. Effect of nuclear structure on J(RMS) values was examined. The present data in the epi-cadmium neutron induced fission of Pu-239 were compared with the similar data in the thermal neutron induced fission of Pu-239 to examine the role of excitation energy on J(RMS) values.

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