Charge Distribution Studies in the Epi-Cadmium Neutron-Induced Fission of 241Pu

초록

For the first time, charge distribution studies have been carried out in the epi-cadmium neutron-induced fission of Pu-241 by measuring the fractional cumulative yields (FCYs) and independent yields of various fission products by using an off-line gamma-ray spectrometric technique. The average energy of the epi-cadmium neutron spectrum is 1.9 MeV. From the FCY values, the isobaric width parameter sigma(Z), most probable charge Z(P), and charge polarization triangle Zeta(EXPT) as a function of fragment mass were obtained. On the other hand, from the independent yield values, isotopic width parameter sigma(A); the most probable mass A(P); and the elemental yields Y-Z of Sn, Sb, Te, I, Xe, Cs, Ba, La, Ce, and Pr were determined by using a nonlinear fit. From the Y-Z values, the proton even-odd effect delta(p) was obtained for the first time. The present data were compared with similar data in the Pu-241(n(th),f) reaction and epi-cadmium neutron-induced fission of Pu-240 as well as other actinides to examine the role of the excitation energy and pairing effect.

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