Prof. Mrutunjaya Bhuyan
Faculty of Science University of Malaya, Kuala Lumpur, Malaysia
Title: Relativistic Medium-Dependent Nucleon-Nucleon Potential: An Application to the Nuclear Fusion Study
Abstract:
The interaction barrier generated by two colliding nuclei plays a crucial role in
understanding- ing complex nuclear reaction dynamics. The repulsive Coulomb and centrifugal
potentials formed between two interacting heavy ions are straightforward, whereas the short-range attractive nuclear potential evaluation is ambiguous. Despite numerous theoretical
efforts, the understanding of the nuclear interaction in the total interaction potential is still
fuzzy [1,2]. In the present analysis, we have introduced in-medium effects in the microscopic
description of the relativistic nucleon-nucleon (NN) interaction potential entitled DDR3Y in
terms of the density-dependent nucleon-meson couplings within the relativistic-Hartree-Bogoliubov (RHB) approach [3,4]. The nuclear densities of the interacting target and projectile
nuclei and NN potentials are obtained for density-dependent DDME1 and DDME2 parameter
sets within the RHB formalism. The DDR3Y NN potential and the densities are used to obtain
the nuclear potential by adopting the double folding approach. This nuclear potential is
further used to probe the fusion dynamics within the l-summed Wong model for a few even-even systems leading to the formation of light, heavy, and superheavy nuclei. The calculations
are also performed for the relativistic R3Y, density-dependent and -independent Michigan 3
Yukawa (M3Y) interaction potentials for the comparison. We observed that the DDR3Y NN
potential gives a better overlap with the experimental data as compared to non-relativistic
M3Y and DDM3Y NN potentials [5]. From the comparison of R3Y and DDR3Y interactions, it is
manifested that the inclusion of in-medium effects in terms of density-dependent nucleon-meson couplings raises the fusion barrier and consequently decreases the fusion and/or
capture cross-section.
References:
[1] G. Montagnoli and A. M. Stefanini, Eur. Phys. J. A 53, 169, (2017).
[2] L. F. Canto, V. Guimaraes, J. Lubian, and M. S. Hussein, Eur. Phys. J. A 56, 281 (2020).
[3] M. Bhuyan, R. Kumar, S. Rana, D. Jain, S. K. Patra, and B. V. Carlson, Phys. Rev. C 101,
044603 (2020).
[4] G. A. Lalazissis, T. Niksic, D. Vretenar, and P. Ring, Phys. Rev. C 71, 024312 (2005).
[5] M. Bhuyan, Shilpa Rana, Nishu Jain, Raj Kumar, S. K. Patra, and B. V. Carlson, Phys. Rev. C
106, 044602 (2022)
Biography:
Dr. Mrutunjaya Bhuyan, Assistant Professor and Deputy Head of the Center for
Theoretical and Computational Physics, University of Malaya (QS World Rank 49),
Kuala Lumpur, Malaysia.
He pursued Ph.D. in Nuclear Astrophysics at the Institute of Physics, Bhubaneswar
and Six years of postdoctoral research experience from various foreign institutions,
namely, the Institute of Theoretical Physics (Beijing, China), Institute
Tecnologico de Aeronautica (Sao Pulo, Brazil), and Day Tan University
(Vietnam).
The recent and ongoing research investigations include 75 SCI Journal
publications and 78 Conference Publications, over 1100 citations and of h-index of 17.
He owns various national and international fellowships:
1. UGC DAE CSR Junior Research Fellowship (India)
2. CSIR Senior Research Fellowship (India)
3. ITP-CAS Postdoctoral Fellowship (China)
4. FAPESP Postdoctoral Fellowship (Brazil)
He has been awarded as Young Scientist Award by the Odisha Physical Society
for the year 2019.
Presently he serves as
1. Associate Editor for 02 International and 01 Indian Scientific Journal
2. Reviewer of 03 National and 18 International Journals
3. Committee member for the Committee of Publication Ethics (COPE)