Abstract
Angular distributions of fission products have been measured as a function of mass asymmetry in the odd-Z 237Np(α29 and 44 MeV,f) system using a recoil-catcher technique and off-line gamma spectrometry. Higher angular anisotropies were observed for the asymmetric mode products compared to the symmetric mode products at both energies. Average anisotropies for individual modes are lower than those for neighbouring even-even fissioning nucleus242Pu due to odd-nucleon spin effect. Present data have been analysed according to the transition state model assuming two modes of fission with characteristic saddle-shapes, barriers and multichance fission probabilities. It is seen that angular distributions for the symmetric and asymmetric modes are decided at and well past the corresponding saddle points respectively. Odd-nucleon spin contribution (〈k 2〉) to the tilting mode variance have been deduced. For (241)Am fission, 〈k 2〉 values for the asymmetric and symmetric modes are ≤ 14 and > 14 ħ2 respectively. The 〈k 2〉 value averaged over several nuclei from preactinide (201Ti) to actinide (248Cf) is 11.5 ± 4.2 ħ2. Average 〈k 2〉 value is in close agreement with the theoretical estimate.
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Datta, T., Dange, S.P., Naik, H. et al. Mass asymmetry dependence of angular distribution in237Np(α29 and 44 MeV,f): single particle effect. Z. Physik A - Hadrons and Nuclei 351, 305–310 (1995). https://doi.org/10.1007/BF01290913
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DOI: https://doi.org/10.1007/BF01290913