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Evidence of compound nucleus theory in the population of incompletely fused composite system \(^{160}\)Dy*

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Abstract

The fusion excitation functions of evaporation residues, populated through complete fusion and/or incomplete fusion, were measured in the \(^{18}\)O+\(^{146}\)Nd system at an incident beam energy of \(\approx \)  3–7 MeV/nucleon. These results were then compared with those obtained from the previously reported \(^{16}\)O+\(^{148}\)Nd system. This comparison is particularly relevant since both systems lead to the population of the same compound nucleus, \(^{164}\)Er*, in the case of complete fusion, and the same intermediate composite system, \(^{160}\)Dy*, in the case of incomplete fusion. Significant enhancements in the measured excitation functions of evaporation residues populated via \(\alpha \)-emitting channels indicate the population of such residues via incomplete fusion in addition to complete fusion. Further, a comparison of the measured data for \(^{18}\)O+\(^{146}\)Nd and \(^{16}\)O+\(^{148}\)Nd systems shows interesting results. The complete fusion and incomplete fusion cross-sections, reduced by three different procedures, are found to satisfactorily match each other, despite the major difference in the \({\alpha }\)- breakup threshold values of the projectiles \(^{18}\)O (6.23 MeV) and \(^{16}\)O (7.16 MeV). The effect of different \({\alpha }\)-breakup threshold values of the projectiles \(^{18}\)O and \(^{16}\)O was not observed in the comparison of incomplete fusion data for the systems \(^{18}\)O+\(^{146}\)Nd and \(^{16}\)O+\(^{148}\)Nd. This may be attributed to the fact that the residues populated in the exit channel are emitted from the same intermediate composite system \(^{160}\)Dy* and also there is a high resemblance in the entrance channel mass asymmetry and other structural properties of these systems.

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Data Availability Statement

This manuscript has associated data in a data repository. [Author’s comment: The cross section data are reported explicitly in tables in the article.]

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Acknowledgements

The authors are thankful to the Director and Convener, AUC, Inter-University Accelerator Centre (IUAC), New Delhi, India, for providing the necessary experimental facilities to carry out the experiments. The authors are thankful to the Target Laboratory In-Charge, Mr. Abhilash S. R., and the operational staff of the Pelletron Accelerator, IUAC, New Delhi, for providing good cooperation during the course of this experiment. DS acknowledges encouragement from the Vice-Chancellor of the Central University of Jharkhand (CUJ), Ranchi, India. The authors express their thanks to the Head, Department of Physics, CUJ, Ranchi, for their motivation and support. One of the authors, NS thanks UGC-DAE-CSR, Kolkata Centre, India for providing financial support in the form of a project fellowship (Ref. UGC-DAE-CSR-KC/CRS/19/NP16/0927).

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Authors and Affiliations

  1. Department of Physics, Central University of Jharkhand, Ranchi, Jharkhand, 835222, India

    Nitin Sharma, Dharmendra Singh, Amritraj Mahato, Rajesh K. Sahoo, Lupteindu Chhura, Pankaj K. Giri & Sneha B. Linda

  2. Department of Physics, Aligarh Muslim University, Aligarh, Uttar Pradesh, 202002, India

    Harish Kumar, Suhail A. Tali & M. Afzal Ansari

  3. Department of Physics, G.F. College, Shahjahanpur, Uttar Pradesh, 242001, India

    Rahbar Ali

  4. Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi, 110067, India

    Sushil Kumar, I. Ahmed,  Yashraj, R. Kumar, K. S. Golda, S. Muralithar & R. P. Singh

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  1. Nitin Sharma
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  2. Dharmendra Singh
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Correspondence to Dharmendra Singh.

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This manuscript has no associated code/software in a data repository. [Author’s comment: Not Applicable.]

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Communicated by Alessia Di Pietro.

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Sharma, N., Singh, D., Mahato, A. et al. Evidence of compound nucleus theory in the population of incompletely fused composite system \(^{160}\)Dy*. Eur. Phys. J. A 60, 72 (2024). https://doi.org/10.1140/epja/s10050-024-01293-8

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