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Dr. Somnath Nag
Assistant Professor
Department of Physics
somnathn.phy@iitbhu.ac.in
9932584517
Area of Interest: 
Nuclear Physics ( Gamma Ray Spectroscopy, Nuclear structure model calculations - cranked Nilsson Strutinsky Model, Shell Model calculations )

  • Study of nuclear structural and excitation modes through gamma spectroscopy. The studies are performed through experiments carried out at TIFR (Mumbai), IUAC(New Delhi) and SINP-VECC (Kolkata).
  • To study various nuclear phenomena such as evolution of collectivity, octupole correlation, existence of time-reversal chirality, gain of spin alignment etc. in the framework of macroscopic- microscopic cranked Nilsson Strutinsky Model.
  • To study the evolution of nuclear structure using microscopic Shell Model calculations.

Journal Publications :

  • Noncollective aligned and antialigned states in 125I by Purnima Singh, Somnath Nag, A. K. Singh et al. Phys. Rev. C 82, 034301 (2010)
  •     Highly deformed high-spin band in 125I by Purnima Singh, Somnath Nag, A. K. Singh et al. Phys. Rev. C 84, 024316 (2011)
  •     Collective and noncollective states in 120Te by Somnath Nag et al. Phys. Rev. C 85, 014310 (2012)
  •     High-spin spectroscopy of 122I by Purnima Singh, Somnath Nag, K. Selvakumar, A. K. Singh et al. Phys. Rev. C 85, 054311 (2012)
  •     Shape evolution in 123Cs and 124Ba nuclei by K. Selvakumar, A. K. Singh, Subhashri Das, Purnima Singh, Somnath Nag et al. Phys. Rev. C 88, 024313 (2013)
  •     Collective and noncollective excitations in 122Te by Somnath Nag et al. Phys. Rev. C 88, 044335 (2013)
  •     Non-collective states in 122Te by Somnath Nag et al. EPJ A 49, 145 (2013)
  • Shape coexistence in the near-spherical 142Sm nucleus by S. Rajbanshi, Abhijt Bisoi, Somnath Nag et al. Phys. Rev. C 89, 014315 (2014)
  •     Revised level structure of 120Te by Somnath Nag, Purnima Singh, A.K. Singh et al. Phys. Rev. C 90, 037302 (2014)
  • Antimagnetic rotation and sudden change of electric quadrupole transition strength in 143Eu by S. Rajbanshi, S. Roy, Somnath Nag et al. Physics Letters B  748 (2015)
  •     Observation of high-spin bands with large moments of inertia in 124Xe by Somnath Nag, A. K. Singh et al. Phys. Rev. C 94, 034307 (2016)
  •     Shears mechanism and development of collectivity in Sm141 by S. Rajbanshi, Sajad Ali, Abhijit Bisoi, Somnath Nag et al. Phys. Rev. C 94, 044318 (2016)
  • Semi-decoupled band and other high-spin band structures in 188Pt, by S. Mukhopadhyay, D. C. Biswas, S. K. Tandel, S. Frauendorf, L. S. Danu, P. N. Prashanth, B. N. Joshi, G. K. Prajapati, B. V. John, Somnath Nag, T. Trivedi, S. Saha, J. Sethi, R. Palit, and P. K. Joshi, Phys. Rev C 96, 014315 (2017).
  • Evidence of antimagnetic rotation in an odd-odd nucleus : The case of 142Eu, by Sajad Ali, S. Rajbanshi, B. Das, S. Chattopadhyay, M. Saha Sarkar, A. Goswami, R. Raut, Abhijit Bisoi, Somnath Nag, S. Saha, J. Sethi, R. Palit, G. Gangopadhyay, T. Bhattacharjee, S. Bhattacharyya, G. Mukherjee, A. K. Singh, and T. Trivedi, Phys. Rev. C 96, 021304(R) 2017
  • Absence of paired crossing in the positive parity bands of 124Cs by A. K. Singh, A. Basu, Somnath Nag, H. Hübel, J. Domscheit, I. Ragnarsson, A. Al-Khatib, G. B. Hagemann, B. Herskind, D. R. Elema, J. N. Wilson, R. M. Clark, M. Cromaz, P. Fallon, A. Görgen, I.-Y. Lee, D. Ward, and W. C. Ma, Phys. Rev. C 97, 024323 (2018).
  • Observation of rotation about the longest principal axis in Zr 89, by Saha, S.,Palit, R.,Sethi, J.,Biswas, S.,Singh, P.,Nag, S.,Singh, A.K.,Ragnarsson, I.,Babra, F.S.,Garg, U.,Goswami, A.,Ideguchi, E.,Jain, H.C.,Kumar, S.,Laskar, M.S.R.,Mukherjee, G.,Naik, Z.l,Palshetkar, C.S., Physical Review C 99, Issue 5,  (2019).
  • Evolution of collectivity and evidence of octupole correlations in Br 73, by Bhattacharya, S.,Trivedi, T.,Negi, D.,Singh, R.P.,Muralithar, S.,Palit, R.,Ragnarsson, I.,Nag, S.,Rajbanshi, S.,Raju, M.K.,Parkar, V.V.,Mohanto, G.,Kumar, S.,Choudhury, D.,Kumar, R.,Bhowmik, R.K.,Pancholi, S.C.,Jain, A.K., Physical Review C 100, Issue 1,  (2019).

Conferences :

  • First observation of highly deformed bands in 120Te by Somnath Nag et al. Proc. of Int. Symp. on Nucl. Phys. 72-73 (2009)
  • Description of collective and non-collective states in 120Te by Somnath Nag et al. Proc. of DAE Symp. on Nucl. Phys. 55, 56-57 (2010)
  • Shell model calculations for Te isotopes by Somnath Nag et al. Proc. of DAE Symp. on Nucl. Phys. 55, 60 - 61 (2010)
  • Study of collective and non-collective states in 120Te by Somnath Nag et al. Research Scholars Workshop on Yrast and Near Yrast Spectroscopy, Experimental and Theoretical Aspects, Kolkata XXXX (2011)
  • Spectroscopy of 120Te by Somnath Nag et al. ANUP Advances in NUclear Physics, Goa XXXX (2011)
  • Study of valence space excitations in 122Te by Somnath Nag et al. Proc. of DAE Symp. on Nucl. Phys. 56, 288 (2011)
  • Band termination in 120-122Te Comparative study of Shell model and cranked Nilsson Strutinsky (CNS) approach by Somnath Nag et al. Proc. of DAE Symp. on Nucl. Phys. 56, 290 (2011)
  • Observation of highly deformed bands in 122Te by Somnath Nag et al. Proc. of DAE Symp. on Nucl. Phys. 57, 218-219 (2012)
  • Highly deformed collective bands in 124Xe by Somnath Nag et al. Proc. of Int. Symp. on Nucl. Phys. 58, 210 (2013)
  • Evolution of Shapes through Collective and Non-Collective Excitations in 120Te, 122Te and 124Xe by Somnath Nag Proceedings of the DAE Symp. on Nucl. Phys. 59 1018-1019 (2014)
  • Structural evolution from low to high-spin states in Xe by S. K. Ghorui,Somnath Nag,A. K. Singh,P. K. Raina,P. K. Rath Proc. of DAE Symp. on Nucl. Phys., 60, 226 (2015)
  • Interplay of shapes through non-collective excitations in neutron deficient A ~ 120 in perspective of122Te, by Somnath Nag ( Invited Talk ) Proceedings of the DAE-BRNS Symp. on Nucl. Phys. 61 (2016).
  • Alignment through shape-coexistence in 124Cs, by Somnath Nag, I. Ragnarsson, and A. K. Singh, Proceedings of the DAE Symp. on Nucl. Phys. 62 (2017).
  •  Deexcitation of three particle - three hole structure in $^{142}$Eu, Sajad Ali,S. Rajbanshi,Prithwijita Ray,Abhijit Bisoi,Somnath Nag,S. Saha,J. Sethi,T. Trivedi,T. Bhattacharjee,S. Bhattacharyya,S. Chattopadhyay,G. Gangopadhyay,G. Mukherjee,R. Palit,R. Raut,M. Saha Sarkar,A. K. Singh,A. Goswami, Proceedings of DAE SNP63, 210-11,  (2018).
  • Alignment gain through shape-coexistence in $^{123}$Xe, Somnath Nag ,Anwesha Basu,I. Ragnarsson,A. K. Singh, Proceedings of DAE SNP63, 272-73,  (2018).
  • Lifetime measurement of nuclear levels of 37Ar, Ananya Das,R. Rahaman,Abhijit Bisoi,S. Sarkar,S. Ray,D. Pramanik,R. Khestri,S. Nag,P. Singh ,K. Selvakumar,A. Goswami,S. Saha,J. Sethi,T. Trivedi,B. S. Naidu,R. Donthi,V. Nanal,R. Palit, Proceedings of DAE SNP63, 156-57,  (2018).
  • Search for octupole correlation in $^{73}$Br, Sutanu Bhattacharya,T Trivedi,R Palit,D Negi,S Nag,S Rajbanshi,M.K Raju,V.V. Parkar,G Mahanto,S Kumar,D Choudhury,R Kumar,R.P. Singh,S Muralithar,R.K. Bhowmik,S.C. Pancholi,A.K. Jain, Proceedings of DAE SNP63, 318-19,  (2018).

Some other Publications :

  • Experimental investigation of shell-model excitations of 89Zr up to high spin by S. Saha et al. Phys. Rev. C 86, 034315 (2012)
  • Superdeformation and alpha-cluster structure in 35Cl by Abhijit Bisoi, M. Saha Sarkar, S. Sarkar, S. Ray, M. Roy Basu, Debasmita Kanjilal, Somnath Nag, K. Selvakumar, A. Goswami, N. Madhavan, S. Muralithar, and R. K. Bhowmik Phys. Rev. C 88, 034303 (2013)
  • High spin spectroscopy in 34Cl by Abhijit Bisoi, M. Saha Sarkar, S. Sarkar, S. Ray, D. Pramanik, R. Kshetri, Somnath Nag, K. Selvakumar, P. Singh, A. Goswami, S. Saha, J. Sethi, T. Trivedi, B. S. Naidu, R. Donthi, V. Nanal, and R. Pal Phys. Rev. C 89, 024303 (2014)
  • Antimagnetic rotation in 104Pd by N. Rather, S. Roy, P. Datta, S. Chattopadhyay, A. Goswami, S. Nag, R. Palit, S. Pal, S. Saha, J. Sethi, T. Trivedi, and H. C. Jain Physical Rev. C 89, 061303(R) (2014)
  • Multiple magnetic rotational bands based on proton alignment in 143Eu by S. Rajbanshi, Abhijit Bisoi, Somnath Nag et al. Physical Rev. C 89, 024318 (2014)
  • Collective excitations in 33S by Abhijit Bisoi, M. Saha Sarkar, S. Sarkar, S. Ray, D. Pramanik, R. Kshetri, Somnath Nag, K. Selvakumar, P. Singh, A. Goswami, S. Saha, J. Sethi, T. Trivedi, B. S. Naidu, R. Donthi, V. Nanal, and R. Pal Phys. Rev. C 90, 024328 (2014)
  • Antimagnetic rotation and sudden change of electric quadrupole transition strength in 143Eu by S. Rajbanshi, S. Roy, Somnath Nag et al. Physics Letters B  748 (2015)
  • Assistant Professor, Dept. of Physics, Balurghat College(Gov. Sponsore), Balurghat, Dakshin Dinajpur. April 2015 to May 2015.
  • Assistant Professor, Dept. of Physics, Dept. of Physics, NIT Raipur, Raipur. May 2015 to January 2018.
  • Assistant Professor, Dept. of Physics, Dept. of Physics, IIT (BHU) Varanasi Januray 2018 till date.

PhD, 2014
Indian Institute of Technology (I.I.T.), Kharagpur, West Bengal, India
• Thesis Title : EVOLUTION OF SHAPES THROUGH COLLECTIVE AND NON-COLLECTIVE
EXCITATIONS IN 120Te, 122 Te AND 124 Xe.
• Advisor: Prof. Ajay Kumar Singh Dept. of Physics, Indian Institute of Technology
(I.I.T) Kharagpur, Kharagpur, West Bengal

MSc in Physics, 2008
Indian Institute of Technology (I.I.T.) Kharagpur, Kharagpur, West Bengal, India
Master Thesis Title: Study of high spin states of  125 I.

BSc in Physics, 2006,
Banaras Hindu University (B.H.U.), Varanasi, Uttar Pradesh, India

 

Teaching at NIT Raipur
Course Title Level Semesters Units
Course Title & No.
 0020113(PH) Applied Physics
 and 0020122(PH)
 Applied Physics Lab.
 
 UG
 (BTech 1st year)
 
5 Wave optics,
 acoustics,
 Dielectrics and
magnetic materials,
superconductivity and
quantum mechanics
 
0020213(PH) Basic Electronics
 and 0020223(PH)
 Basic Electronics Lab
 
 UG
 (BTech 1st year)
 
5   Crystallography
 and semiconductors,
 solid state device
and digital electronics
and EM Theory.

 
 

 
Teaching at IIT (BHU) Varanasi
Course Title Level Semesters Units
PHY 504 Advanced Mathematical and Computational Physics PhD Course Work 2 (2017-18 Even Sem), (2018-19 Even Sem) Complex Analysis, Linear Vector Spaces and Hilbert Space, Fourier and Laplace Transforms.
PHY 401 Nuclear and Particle Physics IDD IV 2 ( 2018-19, 2019-20 Odd Sem) Nuclear Structure, Nuclear Reaction, Nuclear Detectors, Nuclear Lab ( GM counter experiment, Gamma spectroscopy, NM.
PHY 503 Advanced Experimental Technique PhD Course Work 1 (2018-19, Even Sem) Application of Nuclear Techniques in Condensed Matter and Material Science
PHY-102 Physics II : Introduction to Engineering Electromagnetic BTech/IDD I 2 ( 2018-19, 2019-20 Odd Sem) Vector and Scalar Fields and operations, Electromagentic Theory, Wave Optics
PHY-103  Modern Physics IDD I 1 (2018-19, Even Sem) Crystallography, Nuclear and Particle Physics
PHY 101 Mechanics Lab IDD I
 
1 (2018-19, Even Sem)  
MSC Physics I : General Lab MSc 2yrs - I 1 ( 2019-20, Odd Sem) Millikan Oil Drop Experiment, Michelson Interferrometer and its application in Magnetostriction effect, e/m measurement using Helmoltz coil, Single diffraction and calibration of photo sensor, BJT characteristics.

 

Teaching at IIT Kharagpur as Teaching Assistant during PhD
Course Title Level Semesters
Nuclear and Particle Physics Lab I MSc 4 terms
Nuclear and Particle Physics Lab II MSc 4 terms
Electronics lab MSc 1 term
First year B. Tech tutorial UG
 (BTech 1st year)
1 term
2nd year B.Tech tutorial UG
 (BTech 2nd year)
2 terms

 
1. Exploratory Project Even Sem 2019 : Path detection of particles in a Cloud Chamber by Mr. Ashutosh Aman
2. UG Project Jan - Dec 2019 : Nuclear Structure analysis in mass 120  region through gamma spectroscopy by Mr. Sunarkani Rajesh.

  •     First position in Physics at Bsc(Hons.) BHU 2006
  •     Institute silver medal was awarded for 2007 2008 on being adjudged to be the best student in order of merit among MSc students at IIT      Kharagpur.
  •     Certificate of proficiency for best project work, 2007 2008 in Msc Physics
  •     The paper Description of collective and non-collective states in 120Te by Somnath Nag et al. has been awarded third prize in the poster presentation in DAE Symp. on Nuclear Physics 2010
  •     The paper Study of valence space excitations in 122Te by Somnath Nag et al. has been awarded first prize in the poster presentation in DAE Symp. on Nuclear Physics 2011.
  •    The paper  Alignment through shape-coexistence in  124Cs, by Somnath Nag, I. Ragnarsson, and A. K. Singh, has been awarded best poster prize in the gamma spectroscopy section during DAE Symp. on Nuclear Physics 2011.
  • GATE 2008 with Percentile of 99.11 and All India Rank (Physics) of 52
  • CSIR UGC NET held on 23rd DEC 2007
  • CSIR UGC NET held on 22nd JUNE 2008

1. Ms. Nidhi Goyel