Specialization

Nuclear Physics

Email

rajkumar@thapar.edu

Contact No.: +91-9646847454

Biography:

Did Ph.D in Nuclear Physics from Panjab University, Chandigarh. Also was a Postdoctoral fellow at University and INFN of Padova, Italy.

Research Projects:

Publications and other Research Outputs

1. Systematic study of the effect of individual rotational energy levels on the fusion cross-section of ¹⁶O-based reactions of range 480 < Z_PZ_T< 592, N. Jain, M. Bhuyan and Raj Kumar, Physica Scripta 98, 025303 (2023).

2. Systematic study of fusion barrier characteristics within the relativistic mean-field formalism, S. Rana, Raj Kumar and M. Bhuyan, Phys. Rev. C 105, 054613 (2022). 

3. Fusion dynamics of astrophysical reactions using different transmission coefficients, S. Rana, Raj Kumar, S. K. Patra and M. Bhuyan, Eur. Phys. J. A 58, 241 (2022).

4. Medium-dependent relativistic NN potential: Application to fusion dynamics, M. Bhuyan, S. Rana, Raj Kumar, S. K. Patra, B. V. Carlson, Phys. Rev. C 106, 044602 (2022).

5. Systematic study of fusion barrier characteristics within the relativistic mean-field formalism, S. Rana, Raj Kumar and M. Bhuyan, Phys. Rev. C 105, 054613 (2022). 

6.  Cluster decay half-lives of 112-122 Ba isotopes from ground and intrinsic excited state using relativistic mean-field formalism, T. M. Joshua, M. Bhuyan, D. Jain, K. Anwar, N Abdullah and Raj Kumar, Phys. Rev. C 105, 044617 (2022). 

7. Fusion cross-section of α-induced reactions for heavy target nuclei, Raj Kumar, S. Rana, M. Bhuyan and P. Mohr Phys. Rev. C 105, 044606 (2022). 

8. Investigation of octupole deformed fragments decaying from even-even isotopes of 222-230 Th, S. Jain, Raj Kumar, S. K. Patra and M. K Sharma, Phys. Rev. C 105, 034605 (2022). 

9. Divergence in the Relativistic Mean Field Formalism: A Case Study of the Ground State Properties of the Decay Chain of  214,216,218 U Isotopes, T. M. Joshua, N. Jain, Raj Kumar, K. Anwar, N. Abdullah and M. Bhuyan, Foundations (Open Access)-MDPI 2, 85-104 (2022). 

10.  Exploring the ground state bulk and decay properties of the nuclei in superheavy island, N. Jain, Raj Kumar and M. Bhuyan, Nucl. Phys. A 1019, 122379 (2022).

11. Fusion of spherical-octupole pairs of colliding nuclei for compact and elongated configurations, S. Jain, M. K. Sharma, and Raj Kumar Chin. Phys. C, 46, 014602 (2021). 

12. S. Rana, Raj Kumar and M. Bhuyan, Fusion cross section of the superheavy Z=120 nuclei within the relativistic mean-field formalism, Phys. Rev. C 104, 024619 (2021).

13. N. Biswal, N. Jain, Raj Kumar, A. S. Pradeep, S. Mishra, and M. Bhuyan, Structural and decay properties of nuclei appearing in the α-decay chains of ^{296,298,300,302,304}120 within the relativistic mean field formalism, Mod. Phys. Lett. A 36, 2150169 (2021).
14. M. Bhuyan, Raj Kumar and S. K. Patra, Comment on the work entitled: “Detail study of application of the relativistic mean-field effective NN forces for heavy-ion fusion within a dynamical model, J. Phys. G: Nucl. Part. Phys. 48, 088001 (2021).
15. S. Rana, Raj Kumar and M. Bhuyan, Fusion dynamics of ¹²C+¹²C reaction: An astrophysical interest within the relativistic mean-field approach, Astronomische Nachrichten, 342, 473-477 (2021).
16. N. K. Virk, Raj Kumar, and M. K. Sharma, Impact of different hydrodynamical mass transfer approaches in the spontaneous fission of Cf isotopes, Int. J. Mod. Phys. E 30, No.1, 2150001(2021).
17. S. Jain, M. K. Sharma, and Raj Kumar, Optimum orientations for octupole deformed nuclei in fusion configuration, Phys. Rev. C (Rapid Comm.) 101, 051601(R)(2020).
18. M. Bhuyan, Raj Kumar, S. Rana, D. Jain, S. K. Patra and B. V. Carlson, Effect of density and nucleon-nucleon potential on the fusion cross-section within the relativistic mean field formalism, Phys. Rev. C 101, 044603(2020).
19. S. Jain, M. K Sharma, and Raj Kumar, Analysis of the barrier characteristics and related fusion properties using 2pF, 3pF and 3pG density functions,  Nucl. Phys. A 997, 121699 (2020).
20. N. K. Virk, Raj Kumar, and M. K. Sharma, Cluster radioactivity within the collective fragmentation approach using different mass tables and related deformations, Eur. Phys. J. A 56, 35 (2020).
21. I. Sharma, Raj Kumar, and M. K. Sharma, Fusion dynamics of compound nuclei with A_CN=166-202 investigated using the different projectiles on ¹⁵⁴Sm target,  Brazilian Journal of Physics 50, 64 (2020).
22. I. Sharma, Raj Kumar, and M. K. Sharma,  Relevance of different Skyrme forces in the dynamics of ^40,48Ca+⁹⁶Zr reactions,  Nucl. Phys. A 983, 276 (2018).
23. M. Bhuyan and Raj Kumar, Fusion cross-section for Ni-based reactions within the relativistic mean field formalism, Phys. Rev. C 98, 054610 (2018).
24. N. K. Virk, M. K. Sharma and Raj Kumar, Role of shell and pairing correction in the dynamics of compound nuclei with A_CN=118-196 using collective clusterization approach,  Nucl. Phys. A 981, 89 (2018).
25. S. Jain, Raj Kumar, and M. K Sharma, Effect of different nuclear density approximations on fusion dynamics within Skyrme Energy Density Formalism, Eur. Phys. J. A 54, 203 (2018).
26. N. K. Virk, Raj Kumar, and M. K. Sharma,  Decay of ^203,204Pb^* nuclei at energies across the Coulomb barrier using cluster emission approach,  Brazilian Journal of Physics 49, 119 (2018).
27. I. Sharma, Raj Kumar, and M. K. Sharma, Probing the role of Skyrme interactions on the fission dynamics of ⁶Li+²³⁸U reaction, Eur. Phys. J. A 53, 140 (2017).
28. Raj Kumar, J. A. Lay, and A. Vitturi, Nuclear fusion as a probe for octupole deformation in ²²⁴Ra, Phys. Rev. C 92, 054604 (2015).
29. D. Jain, M. K. Sharma, Rajni, Raj Kumar, and R. K. Gupta, Systematic analysis of hot Yb^* isotopes using energy density formalism, Eur. Phys. J. A 50, 155 (2014).
30. Rajni, Raj Kumar, and M. K. Sharma, Formation and decay of ²⁰⁰Pb^* using different incoming channels, Phys. Rev. C 90, 044604 (2014).
31. Raj Kumar and  D. Jain, Entrance channel effect with stable and radioactive beams using dynamical cluster decay model, Nucl. Phys. A 929, 169 (2014).
32. Raj Kumar, J. A. Lay, and A. Vitturi, Enhanced sub-barrier fusion for proton halo nuclei, Phys. Rev. C 89, 027601 (2014).
33. G. Kaur, D. Jain, Raj Kumar, and M. K. Sharma, Formation and decay cross sections of ⁶⁶As^* formed in an exotic proton-halo ⁸B induced reaction, Nucl. Phys. A 916, 260 (2013).
34. D. Jain, Raj Kumar, and M. K. Sharma, Effect of deformation and orientation on interaction barrier and fusion cross-sections using various proximity potentials, Nucl. Phys. A 915, 106 (2013).
35. Raj Kumar, K. Sandhu, M. K. Sharma, and R. K. Gupta, Fusion-evaporation residues and α-decay chains of the superheavy element Z=115 formed in the ²⁴³Am + ⁴⁸Ca reaction using the dynamical cluster-decay model, Phys. Rev. C, 87, 054610 (2013).
36. D. Jain, Raj Kumar, and M. K. Sharma, Reaction dynamics of Pt^* isotopes formed using stable and radioactive Sn beams, Phys. Rev. C 87, 044612 (2013).
37. Raj Kumar, Cluster radioactivity using various versions of nuclear proximity potentials, Phys. Rev. C 86, 044612 (2012).
38. G. Sawhney, Raj Kumar and M. K. Sharma, Decay of ²⁴¹P^u* formed in ⁹Be + ²³²Th around the Coulomb barrier using static and dynamic deformations, Phys. Rev. C 86, 034613  (2012).
39. M. Bansal, S. Chopra, R. K. Gupta, Raj Kumar and M. K. Sharma, Dynamical cluster-decay model using various formulations of a proximity potential for compact non-coplanar nuclei: Application to the ⁶⁴Ni +¹⁰⁰Mo reaction, Phys. Rev. C 86,034604 (2012).
40. Raj Kumar and M. K. Sharma, Systematic study of various proximity potentials in ²⁰⁸Pb-daughter cluster radioactivity, Phys. Rev. C 85, 054612 (2012).
41. D. Jain, Raj Kumar, M. K. Sharma and R. K. Gupta,, Skyrme forces and the fusion-fission dynamics of ¹³²Sn+⁶⁴Ni→¹⁹⁶Pt^* reaction,Phys. Rev. C 85, 024615 (2012).
42. M. Kaur, Raj Kumar and M. K. Sharma, Systematic study of the decay of ^118,122Ba^* formed in ^78,82Kr induced reactions at E_lab=5.5 MeV/nucleon, Phys. Rev. C 85, 014609 (2012).
43. Raj Kumar, Effect of isospin on fusion reaction cross-section using various nuclear proximity potentials within the Wong model, Phys. Rev. C 84, 044613 (2011).
44. Raj Kumar, M. K. Sharma, and R. K. Gupta,  Fusion reaction cross-sections using the Wong model within Skyrme energy density based semiclassical extended Thomas Fermi approach,  Nucl. Phys. A  870-871, 42 (2011).
45. R. K. Gupta, S. K. Arun, Raj Kumar, and M. Bansal,  Dynamical cluster-decay model for fusion cross-sections below the Barrier,  Nucl. Phys. A 834, 176c (2010).
46. Raj Kumar, M. Bansal, S. K. Arun and R. K. Gupta, Angular momentum effects and barrier modification in sub-barrier fusion reaction using the proximity potential in Wong formula, Phys. Rev. C 80, 034618 (2009).
47. S.K. Arun, Raj Kumar and R. K. Gupta, Fusion-evaporation cross-sections for the ⁶⁴Ni+¹⁰⁰Mo reaction using the dynamical cluster-decay model,  J. Phys. G: Nucl. Part. Phys. 36, 085105 (2009).
48. R.K. Gupta, S.K. Arun, Raj Kumar, and Niyti, Collective clusterization in hot and rotating nuclei: Preformed-cluster based dynamical cluster-decay model,  Int. Rev. Phys. (IREPHY) 2, 369-384, December (2008).
49. Raj Kumar and R. K. Gupta, Decay of ^118,122Ba^* compound nuclei formed in ^78,82Kr+⁴⁰Ca reactions using  the dynamical cluster-decay model of preformed clusters,  Phys. Rev. C 79, 034602 (2009).
50. R. K. Gupta, D. Singh, Raj Kumar and W. Griener,  Universal functions for nuclear proximity potential using the semiclassical approach of energy density formalism, J. Phys. G: Nucl. Part. Phys. 36, 075104 (2009.
51. R. K. Gupta, S. K. Arun, D. Singh, Raj Kumar, Niyti, S. K. Patra, P. Arumugam and B. K. Sharma, Clusters in light, heavy, super-heavy and super-superheavy nuclei,  Int. J. Mod. Phys. E 17, 2244 (2008).

Books or Contributed Chapter to the Books:

• Chapter Title: Relativistic mean-field treatment to the fusion cross-section of the reaction 12 C+ 20 Ne using Hill-Wheeler and Morse transmission coefficients, S. Rana, T. M. Joshua, N. Jain, M. Bhuyan, Raj Kumar, and S. K. Patra,
  Book Title: Intelligent Systems, Chapter No 23, DOI: 10.1007/978-981-19-0901-6_23,
  Publishers: Springer Nature (2022).
• Chapter Title: Relativistic R3Y Nucleon–Nucleon Potential: Decay Characteristics of
  124 Ba Isotope within the Preformed Cluster Decay Approach, T. M. Joshua, S. Rana, N. Jain, K. Anwar, M. Abdullah, Raj Kumar, and M. Bhuyan,
  Book Title: Intelligent Systems, Chapter No 13, DOI: https://doi.org/10.1007/978-981-19-
  0901-6_13, Publishers: Springer Nature (2022).Raj Kumar, 
• Raj Kumar, Book Title: Dynamics of heavy ion reactions using the energy density formalism, LAP Lambert Academic Publishing, ISBN: 9783659253317, 3659253316, Edition: 2012.
• Raj Kumar, M. Bhuyan, D. Jain, and B. V. Carlson, Chapter Title: Theoretical description of low energy nuclear fusion, Book Title: Nuclear Fusion, Edited by: A. Shukla and S. K. Patra, ISBN: 9780429288647, Publishers: CRC Press, London (2020).

Awards and Honours

• Member Board of Studies (UG): MGC College, Fatehgarh (2021-2023).

• Member Board of Studies (UG): Khalsa College, Patiala (2018-2020).

• Completed with Distinction, “New Direction Programme in Teaching & Learning” by Trinity College, Dublin, Ireland in collaboration with TIET, Patiala, India, March 2018 to February 2019.

• Best Poster Award in the Show Case Event, “New Direction Programme in Teaching & Learning”, Trinity College, Dublin, Ireland in collaboration with TIET, Patiala, India; 09^th April 2019.

• Session Chair, INDO-French Seminar on ‘Mutifragmentation, collective flow and sub-threshold particle production in heavy ion reactions’, Panjab University, Chandigarh, India, February 406, 2019.

• SEED Money Project, Thapar Institute of Engineering & Technology (2017).

• Young Scientist, DST, Govt. of India (2016).

• Postdoctoral Fellowship, University and INFN of Padova, Italy (2013) & (2014).

• Dr. D. S. Kothari Post Doctoral Fellowship, UGC- India (2012).

• Referee for Nuclear Physics A (Elsevier).

• Referee for Results in Physics (Elsevier).

• Referee for Phys. Rev. C

• Invited Talk titled: “Fusion cross-section of superheavy nuclei with Z = 120” in the “Online International Conference on Recent Trends in Nuclear Physics”, 16^th -18^th February, 2022, Central University of Himachal Pradesh (CUHP), India.

• Invited Talk titled: “Effect of deformation and orientation in the nuclear fusion reactions” in the “International Conference on Theoretical Aspects of Nuclear Physics”, 15^th -20^th February, 2021, Central University of Himachal Pradesh (CUHP), India.

• Senior Research Fellow (Open) by CSIR, New Delhi (2009).

• CSIR-UGC NET- [December 2010 (AIR-0036), June 2010 (AIR-0061).]

• GATE (2007) qualified.

• Prize for Oral Presentation in CHASCON2010, Chandigarh, India.

• Tritya Sopan of “Bharat Scouts and Guides”, Chandigarh, Punjab (1996).

Thesis Supervised or Ongoing:

• Ph.D : 7 (Completed: 2, Ongoing:5)
• M.Sc. :  12 (Completed: 11, Ongoing:1)

Description of Research Interests

I am working on the theory of nuclear structure, heavy ion reactions and channel couplings at low energies and clustering phenomena in the excited compound nucleus, which has direct implication to astrophysics problems. The work done by me so far has the potential of getting extended in many other directions for obtaining a good understanding of nuclear structure in general and nuclear dynamics in particular.