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A systematic experimental study of pre-compound emission in \(\alpha \)-particle induced reactions on odd mass nuclei A = 103–123

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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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Data Availability Statement

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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Authors and Affiliations

  1. Department of Physics, Shri Varshney College, Aligarh, 202 001, India

    Manoj Kumar Sharma & Mahesh Kumar

  2. Accelerator Laboratory, Physics Department, Aligarh Muslim University, Aligarh, 202 002, India

    Mohd. Shuaib, Ishfaq Majeed, M. Shariq Asnain, B. P. Singh & R. Prasad

  3. Instituto de Física, Universidad Nacional Autónoma de México, Av. Universidad 3000, 04510, Ciudad de México, Mexico

    Vijay R. Sharma

  4. Physics Department, Jamia Millia Islamia (A Central University), New Delhi, 110 025, India

    Abhishek Yadav

  5. Department of Physics, Indian Institute of Technology Ropar, Rupnagar, Punjab, 140 001, India

    Pushpendra P. Singh

  6. Department of Physics, University of Petroleum and Energy Studies, Dehradun, 248007, India

    Devendra P. Singh

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  1. Manoj Kumar Sharma
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Correspondence to Manoj Kumar Sharma.

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Communicated by Sailajananda Bhattacharya

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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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