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H. Naik, R. J. Singh, R. H. Iyer

Fission fragment angular momentum in the spontaneous fission of ²⁴⁴Cm

Independent isomeric yield ratios (IYR) of ¹²⁸Sb, ¹³⁰Sb, ¹³²Sb, ¹³¹Te, ¹³³Te, ¹³²I, ¹³⁴I, ¹³⁵Xe and ¹³⁸Cs have been determined in the spontaneous fission of ²⁴⁴Cm using off-line gamma ray spectrometric technique. From the IYR, fragment angular momenta (J_rms) have been deduced using spin dependent statistical model analysis. It was observed that: (i) J_rms of fragments having spherical 82n shell and even-Z products are lower than the fragments away from spherical neutron shell and odd-Z products which indicates the effect of nuclear structure. (ii) The yield-weighted average angular momentum shows an inverse correlation with the elemental yield which indicate coupling between collective and intrinsic degrees of freedom. (iii) Comparison of the present data in ²⁴⁴Cm(SF) with similar data for ²⁴⁵Cm(n_th,f) shows comparable odd-even effect on fragment angular momentum in both fissioning systems inspite of higher odd-even effect on elemental yield in the former compared to latter. This may be due to the linear correlation of J_rms with deformation parameter and thus with deformation energy unlike the exponential dependence of the proton odd-even effect on intrinsic excitation energy.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 92, 01/2004
Pages: 001 - 004

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