INDC(IND)-35G - IAEA Nuclear Data Services

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Effeot of excitation energy on the isotoplo yield distribution of Iodin» is vhe
fission of 23 S.
A.V.R. Reddy, T. Datta, S.M. Desbaukh, S.K. Sahakunda, S.B. llanohar, Satya Erakash
and 11.7. iiaaaniah
With an ata to examine the role of excitation energy on the charge/mass polariza-
tion, studies on isotopio yield distribution of .iodine in the alpha induced fission
of 252 Th ( 25 V\ 5* . 23.4 MeV) were oarried out and the obtained systeaatios of
the distribution were ooapared with the ease in the thermal neutron induced fission
of *"HJ ( *TJ , S -6.5 MeT), Irradiations wet* oaxxied out using external
-particle beast of ener&- 30 ± 0.5 MeV at the 88" Variable Energy Cyolotron,
Calcutta using thoriw aetal foil (29*7 •«/« ) target at a bean current of
2.5 «A. Independent yields of iodlm f130-134) and cumulative yields of its
precursors (Telluriua 131-134) were determined with and without radioohemioal
separations for iodine using high resolution gana speotrometry, relative to the
cumulative yield of ? 'l, and are given in Tables 1 and 2 respectively.
Using the obtained independent yields of Iodine in the present work, the paraaeters
of isotopic yield distribution via aost probable nass (A. ) and width of distribution
( 0".) were evaluated aa 135*09 and 1.6 ±0.16 •ass units respectively and the
corresponding values in low energy system are 135*90 and 1.21 + 0.12 aass units
respectively* Inorease in