Charge and mass distribution in⁷Li induced fission of²³²Th

Abstract

Formation cross sections of about forty fission products have been determined using recoil catcher technique followed by off line gamma-ray spectrometry in 7 Li induced fission of 232 Th at E lab = 41.9, 36.6 and 31.4 MeV. The measured data have been used to deduce charge and mass distributions. Mass distribution is found to be asymmetric at all the three energies. Cross sections of evaporation residues formed in both transfer reactions ( 232,233,234 Pa) as well as in complete fusion ( 234 Np), have also been measured. The measured evaporation residue cross sections and the decay probabilities of target like nuclei ( 233,234,235 Pa) formed in the various transfer reactions, as calculated by PACE2, have been used to estimate the transfer induced fission cross sections. The data indicated that the magnitude of transfer induced fission is very small.

Nondestructive determination of plutonium by gamma spectrometry and neutron well coincidence counting

“…A representative sample from each set was also counted on the 2cc HPGe detector having a thin Be window for gamma ray spectrum. This was required to obtain the isotopic composition [3] which is needed to obtain Pu amount from the coincidence counting data.…”