Abstract
The nuclear level density of \(^{115}\hbox {Sn}\) has been measured in an excitation energy range of \(\sim 2\)–9 MeV using the experimental neutron evaporation spectra from the \(^{115}\hbox {In}\)(p, n)\(^{115}\hbox {Sn}\) reaction. The experimental level densities were compared with the microscopic Hartree–Fock BCS (HFBCS), Hartree–Fock–Bogoliubov plus combinatorial (HFB + C), and an exact pairing plus independent particle model (EP + IPM) calculations. It is observed that the EP + IPM provides the best description of the experimental data among the three. The thermal properties (entropy and temperature) of \(^{115}\hbox {Sn}\) have been investigated from the measured level densities. The experimental temperature profile as well as the calculated heat capacity show distinct signatures of a transition from the strongly-paired nucleonic phase to the weakly paired one in this nucleus.
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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 would like to acknowledge the VECC Cyclotron operators for smooth running of the accelerator during the experiment. We are thankful to J. K. Meena, A. K. Saha, J. K. Sahoo and R. M. Saha for their help during the experimental setup. The authors also thanks Jhilam Sadhukhan for the stimulating discussions.
NQH’s works are funded by The National Foundation for Science and Technology Development of Vietnam through Grant Number 103.04-2019.371.
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Communicated by Navin Alahari.
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Roy, P., Banerjee, K., Rana, T.K. et al. Nuclear level density and thermal properties of \(^{115}\hbox {Sn}\) from neutron evaporation. Eur. Phys. J. A 57, 48 (2021). https://doi.org/10.1140/epja/s10050-021-00373-3
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DOI: https://doi.org/10.1140/epja/s10050-021-00373-3