Abstract
The compound and pre-compound emission processes have been established as two main competing de-excitation modes of an excited nucleus by-dint-of evaporation and emission of light fast particles in low energy \(\alpha \)-induced reactions, respectively. An existence of the plenty experimental data on above established processes for a wide range of mass nuclei coerces to drive for some systematic trends in such reactions with excitation energy and mass number (A). Present work is an attempt to develop a systematics on the pre-compound emission process by analysing consistent experimental cross-section data of \(\alpha \)-particle induced reactions on odd Z and odd A isotopic target nuclei viz., \(^{103}\)Rh, \(^{107}\)Ag, \(^{109}\)Ag, \(^{113}\)In, \(^{115}\)In, \(^{121}\)Sb, and \(^{123}\)Sb, respectively. The analysis of data indicates sarcastic deviation in the experimental cross-section data with respect to calculations performed by the statistical Monte-Carlo code pace4 beyond the peak region. Such deviation becomes more prominent towards tail portion of excitation functions, which is regarded as a significant contribution of the pre-compound emission process. Observed energy dependent uniformity of such deviation for all studied reactions gives a clue for existing some systematics on concerning process with atomic mass number (A). Present study is an extension of previous work [Eur. Phys. J. A 54, 205 (2018)], but rather in more precise way for nearby isotopic target mass nuclei \(^{107}\)Ag, \(^{109}\)Ag, \(^{113}\)In, \(^{115}\)In, \(^{121}\)Sb, and \(^{123}\)Sb, respectively, where role of the Coulomb barrier V\(_b\) and target deformation is found to be significantly important in the systematic decay of excited nuclei through emission of light fast particles in pre-compound process with mass number (A).
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This manuscript has no associated data or the data will not be deposited. [Authors’ comment: All data generated during this study are contained in this published article.]
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Acknowledgements
The authors are thankful to the Director, VECC, Kolkata, India for extending all the facilities for carrying out the experiments. One of the authors M.K.S. thanks the Council of Scientific and Industrial Research (CSIR), New Delhi (Project No. 03(361)16/EMR-11 for financial support.
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Sharma, M.K., Kumar, M., Shuaib, M. et al. A systematic experimental study of pre-compound emission in \(\alpha \)-particle induced reactions on odd mass nuclei A = 103–123. Eur. Phys. J. A 56, 247 (2020). https://doi.org/10.1140/epja/s10050-020-00238-1
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DOI: https://doi.org/10.1140/epja/s10050-020-00238-1