•  Relativistic Heavy Ion Collisions: Studies on Relativistic Heavy Ion Collisions from AGS to  LHC energies.
• Detector related R&D: Fabrication and testing of gas detectors
•  Radiation Physics: Studies on environmental radon and uranium concentrations of soil and rock samples.     

• Former Head of the Department of Physics and Dean of faculty of Science
• National Merit Scholarship at undergraduate level
• Team Leader of GU Group for  LHC-ALICE International          Collaboration of CERN, Switzerland  (An international collaborative research project undertaken after signing of a MoU between CERN, Switzerland and Gauhati University under the agies of DST, Govt. of India)
• Team Leader of GU Group for  FAIR-CBM International Collaboration of GSI, Darmstadt, Germany (An MoU signed between the Govt. of India     and the Govt. of Federal Republic of Germany for a long term scientific collaboration for participation of a few Indian Institute on the design and construction of the future facility for Anti-proton and ion research (FAIR) to be erected at GSI, Darmstadt, Germany. Gauhati University is one of the collaborating Institutes of India in FAIR-CBM experiments)
• Took all initiative to start M.Sc. Radiological Physics course of GU in collaboration with Dr. B Baruah Cancer Institute (A DAE Organization), Guwahati and Founder Coordinator of GU for the M.Sc. Radiological Physics course
• Convener of 5^th Conference of Physics Academy of the North East.
• Guest Editor of Indian Journal of Physics, Vol. 82, No. 5 & 6, 2008.
• Chief Editor of 'A Book on Selected Topics in Physics Research' (2021) published by the Physical Society of the Department of Physics, GU and published in Gauhati University Press 
• Served as General Secretary of Physics Academy of the North East (PANE) for two consecutive terms (2012-2016)   

Member of Different Committees/Boards:

• Member of the DRC of Cotton State University
• Vice Chancellor's (ASTU) nominee in the Board of Governors of Pratiskha Institute of Pharmaceuticals Sciences, Guwahati
• Member of Post Graduates Boards of Studies in Physics in Assam, University.
• Vice Chancellor’s (North Bengal University) nominee in the Advisory Committee of High Energy and Cosmic Ray Centre, North Bengal University, Siliguri, WB.
• Vice Chancellor’s (GU) nominee in the Advisory Board of S. T. RADAR Centre, GU
• Vice Chancellor’s (GU) nominee as a member of the Regional Coordination Council of ISRO-GU RAC-S

          ONGOING/COMPLETED RESEARCH PROJECTS :

• 'Elastic Scattering of Light Mirror Nuclei' funded by Nuclear Science Centre, New-Delhi (1999-2004) (Rs. 7L)
• 'Studies the spectator parts of high energy nucleus-nucleus collisions' funded by     DAE-BRNS, Mumbai (2005-2008)  (Rs. 8L)    
• 'Pre-Operative Programme for Indian Participation in the FAIR Project at the GSI, Darmstadt, Germany - Accelerator and Detector – R&D and Prototyping' funded by DST, New Delhi (2009- 2013)   (Rs. 39 lakh

• ‘ALICE- Operation and Utilization’ funded by DST, New Delhi (2013-2014)  (Rs. 90L)

• ‘ALICE- Upgrade, Operation and Utilization’ funded by DST, New Delhi (2014 - 2020) (Rs. 2.45 Crores)   
• 'Indian Participation in the ALICE experiment at CERN' funded by DST, New Delhi (2021 - 2026) (Rs. 3.65 Crores)  

I

       Number Ph.D produced:  (8)

• Dr. Saumyajit Sengupta
• Dr. (Ms.) Barnali Debnath
• Dr. Ranjan Kakoti
• Dr. (Ms.) Rupalim Talukdar
• Dr. Kalyan Dey
• Dr. Nur Hussain
• Dr. Pranjal Sarma
• Dr. Somen Gope

       Number of Ph.D Scholars presently working:  (2)

• Mr. Banajit Barman (GATE, Full Time)
•   Mr. Dhrubajyoti Choudhury (UGC-CSIR NET-JRF Fellow, Full Time)

      Selected Publications:   

• Measurement of Light flavor particle production in pp collisions at sqrt(s) = 900 GeV and sqrt(s) = 13.6 TeV using the RUN3 data – Banajit Barman, Dhrubajyoti Choudhury and Buddhadeb Bhattacharjee (Department of Physics, Gauhati University, India), Johanna Lomker (Utrecht University and NIKHEF, Netherland), Nicolo Jacazio (University of Bologna and INFN, Italy) and Ivan Ravasenga (CERN, Switzerland): ALICE-ANA-1445-2022-xxx (Link: https://alice-notes.web.cern.ch/node/1445)
• Physics performance studies of CBM-TOF detector - Somen Gope and Buddhadeb Bhattacharjee, Acta Physica Polonica B 53, 9-A3 (2022).
• Signature of intermittency in hybrid UrQMD hydro data at 10 AGeV Au+Au collisions - Somen Gope and Buddhadeb Bhattacharjee, Phys. Journal A, 57,44 (2021)
• Multiplicity dependence of π, K, and p production in pp collisions at √s = 13 TeV - B. Bhattacharjee, … P. Sarma*, et al. for ALICE Collaboration, Phys. J. C 80, 693 (2020) link: https://link.springer.com/article/10.1140/epjc/s10052-020-8125-1 *Pranjal Sarma is one of the Paper Committee members
• Production of charged pions, kaons, and (anti-)protons in Pb-Pb and inelastic pp collisions at (sqrt) S = 5.02 TeV - Acharya et al. for ALICE collaboration (B Bhattacharjee, N Hussain, G Volpe, Y C Morales, N Jacazio, A O Ravasenga, and  O V Rueda are the authors of the Analysis Note), Phys. rev. C 101,  044907,(2020)  (https://journals.aps.org/prc/abstract/10.1103/PhysRevC.101.044907) : (https://arxiv.org/abs/1910.07678
• Color reconnection as a possible mechanism of intermittency in the emission spectra of charged particles in PYTHIA-generated high-multiplicity pp collisions at energies available at the CERN LargeHadron Collider - Pranjal Sarma and Buddhadeb Bhattacharjee, Phys. rev. C 99, 034901, (2019) (https://journals.aps.org/prc/abstract/10.1103/PhysRevC.96.024903) (https://arxiv.org/abs/1709.02660 ) 
• Studies of non-statistical fluctuation using scaled factorial moment technique in high-multiplicity pp and Pb-Pb collisions at the LHC energies - Pranjal Sarma and Buddhadeb Bhattacharjee, Analysis note, No: ALICE-ANA-2019-971 (2019): ALICE Internal link: https://alice-notes.web.cern.ch/node/971
• Role of net baryon density on rapidity width of identified particles from the lowest energies available at the CERN Super Proton Synchrotron to those at the BNL Relativistic Heavy Ion Collider  and at the CERN Large Hadron Collider - Nur Hussain and Buddhadeb Bhattacharjee, Phys. Rev. C 96, 024903 (2017): (https://journals.aps.org/prc/abstract/10.1103/PhysRevC.96.024903(https://arxiv.org/abs/1709.02660)
• Strange behavior of rapidity dependent strangeness enhancement of particles containing and not containing leading quarks - Kalyan Dey and B. Bhattacharjee, Nucl. Phys. A 965 (2017) 74-84
• Centrality dependence of the Charged-Particle Multiplicity Density at   Midrapidity in Pb-Pb Collisions at √ sNN = 5.02 TeV - Adam......B. Bhattacharjee et. al. for ALICE Collaboration, Phys. Rev. Lett. 116 (2016), 222302
• Centrality dependence of the nuclear modification factor of charged pions, kaons, and protons in Pb-Pb collisions at √ sNN = 2.76 TeV - Adam........ B. Bhattacharjee et. al. for ALICE Collaboration , Phys. Rev. C 93 (2016) 034913
• Centrality evolution of the charged-particle pseudorapidity density over a broad pseudorapidity range in Pb-Pb at  √sNN = 2.76 TeV - J. Adam……B. Bhattacharjee  al. for ALICE Collaboration, Phys. Lett. B 754 (2016) 373–385
• Measurement of pion, kaon and proton production in proton-proton collisions at √s = 7 TeV - Adam, ……., B. Bhattacharjee et. Al for ALICE Collaboration., Eur. Phys. J. C 75 (2015) 226
• Design and performance simulation of a segmented-absorber based muon detection system for high energy heavy ion collision experiments - Ahmad, P.P. Bhaduri, H. Jahan, A. Senger, R. Adak, S. Samanta, A. Prakash, K .Dey, A. Lebedev, E. Kryshen, S. Chattopadhyay, P. Senger, B. Bhattacharjee, S. K. Ghosh,S. Raha, M. Irfan, N. Ahmad, M. Farooq, B. Singh, Nuclear Instruments and Methods in Physics Research A, 775 (2015) 139-147  
• Separate Mass Scaling of the Width of the rapidity Distributions for Mesons and Baryons at Energies Available at the Facility for Antiproton and Ion Research - Kalyan Dey and B. Bhattacharjee, Phys Rev. C 89 , 054910, 2014.
• System size effect on critical behaviour in nuclear multifragmentation - B Bhattacharjee and R Talukdar (2011), Nucl. Phys. A, 864, 167-175
• Estimation of alpha activity in various sources of water in different places of Karbi Anglong district of Assam- R K Kakoti and B Bhattacharjee (2011), Ind J Pure & Appl Phys., 7(1), 1-5       
• Effect of system size on traditional signatures of critical behaviour in projectile multifragmentation - B Bhattacharjee and R Talukdar (2011), J Phys CS, 312, 082014 
• Seasonal and spatial variation of radon and thoron concentration in the dwillings of Karbi Anglong district of Assam, India using SSNTDs - R K Kakoti, R Mehata and B Bhattacharjee (2011),Int J Appl Environ Sci, 6(2), 165-171
• Variation of multiplicity of charged particles on the geometry of collision - R Talukdar, B Debnath, S Sengupta and B Bhattacharjee, Ind J Phys., 84(6), 757 – 761 (2010)
• Evidence of phase transition in the break-up of Kr-projectile nuclei at 0.95 GeV - B Bhattacharjee and B Debnath,  Nucl. Phys. A829, 2009, 210 - 233 
• Variation of mean multiplicity of intermediate mass fragments with the bound charge of the fragmenting system - Deviation from the universal behaviour- B Bhattacharjee and B Debnath, IoP, Journal of Physics: CS, Vol. 110, 122003, 2008.                
• Effect of collision geometry on the multiplicity of secondary charged particles emitted from  84Kr-AgBr interactions at 950 MeV/A - B Bhattacharjee, B Debnath and S Sengupta, Indian J. of  Phys,    Vol. 82 (6), 2008.
• Emission characteristics of intermediate mass fragments on the residual part of the projectile nucleus - B Debnath, R Talukdar and B Bhattacharjee, Indian J. of Phys, Vol. 82 (5), 2008
• Erraticity moment of bin multiplicity & rapidity gap of fast TFs from 84Kr-AgBr interaction at 0.95A GeV/c - B Bhattacharjee, B Debnath, A Mukhopadhyay and S Sengupta,  Indian J. of Phys, Vol 81(7), 1-10, 2007.
• Signature of intermittent behavior in the emission spectra of target associated particles from 84Kr-AgBr interactions at 0.95GeV/A - B Bhattacharjee, Nucl.  Phys. A, Vol. 748, 641, 2005.
• Investigation of scattering between mirror nuclei  7Be +  7Li - Barua, ……B. Bhattacharjee et al., Phys. Rev. C, Vol. 72, p- 044602, 2005.
• Fractal analysis of fluctuation in the emission spectrum of target associated fast particles - B Bhattacharjee and S Sengupta, Int. J.  Mod. Phys. E, Vol. 14, No. 8, 1223-1233, 2005.
• Study of the elastic scattering of mirror nuclei 7Be + 7Li – Barua, …B. Bhattacharjee et al. , Nucl. Phys. A, Vol. 746, 467c, 2004.
• On the emission of fast and slow target frag. from 84Kr-AgBr interactions at 0.95 GeV/A - S Sengupta, A Mukhopadhyay, V Singh and B Bhattacharjee, Radiation Measurement (Elsevier Science), Vol. 36, 2003.
• Radon Pollution Studies in the Environs of Brahmaputra Valley of Assam Using Solid State Nuclear Track Detector – P K Deka,….B. Bhattacharjee et al. , Radiation Measurement, Vol. 36, 2003.
• Measurement of Indoor Radon Progeny Levels in Some Dwellings of North Kamrup in Brahmaputra Valley - P K Deka et al. , Indian Journal of Environmental Protection, Vol. 21, 2001
• Simultaneous Determination of Radon, Thoron and Their Progeny in Dwellings -Bhattacharjee et al., Radiation Measurement, Vol. 33, 2001.
• Current Trends in Nuclear Physics - B Bhattacharjee, Horizon, Vol. 1, 1999.
• Possible Angular Correlation of Emitted Black Particles in 1.8 GeV/c  k- -CNO Interaction - S Sarkar, B Bhattacharjee, T D Goswami, and K Goswami, Indian. J. Physics, Vol. 73A(4), 1999.
• DC Conductivity and Dielectric Constant of CN Detector -  B Bhattacharjee, H L Das and T D Goswami, Radiation Measurement, Vol. 25, 1995.
• DC Conductivity of CN Track Detector - B Bhattacharjee, HL Das and T Goswami, Radiation Measurement, Vol. 23, 1994.
• Dielectric Properties of Cellulose Nitrate Track Detector - B Bhattacharjee, K Goswami, H L Das and T D Goswami, J. Instrum. Soc. Of India, Bangalore, Vol. 22, 1992.

FEW PUBLICATIONS IN THE PROCEEDINGS:

• Rapidity dependence of strangeness enhancement factor at FAIR energies -- Kalyan Dey and Bhattacharjee59th DAE symposium on Nuclear  Physics, 2013
• Hit finding efficiency and J/ψreconstruction efficiency of the MUCH detector -- Kalyan Dey, S. Chattopadhyay and  Bhattacharjee, CBM progress report 2013, GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
• An investigation on the mass/species type behavior of produced particles at FAIR energies - A different approach -- Kalyan Dey and Bhattacharjee, 58th DAE symposium on Nuclear  Physics, 2013
• Pseudorapidity Response of MuCh Detector in FAIR-CBM Experiment -- Kalyan Dey and B. Bhattacharjee, 56th DAE symposium on Nuclear Physics, 2011
• Effect of system size on traditional signatures of critical behaviour in projectile multifragmentation – B Bhattacharjee and R Talukdar (2011), J Phys CS, 312,082014
• Variation of mean multiplicity of intermediate mass fragments with the bound charge of the fragmenting system-Deviation from the universal behaviour – B Bhattacharjee and B Debnath, J Phys CS, 110, 122003, 2008.

• Delivered 4^th Raman lecture entitled “Understanding building blocks of matter” on 27^th March 2023 in the Department of Physics, Bodoland University, India.
• Delivered Invited talk in the biennial conference of Physics Academy of the North East held at Manipur University during 8-10 Dec. 2022 and chaired a session.
• Delivered a public speech (live webinar) titled “Mini Bangs – Mimics of the Big Bang” on 26^th August, 2021 organised by Regional Science Centre, Guwahati (National Council of Science Museum) Ministry of Culture, Govt. of India.
• Delivered an invited talk entitled “Primordial Matter” in TRENDS IN MODERN PHYSICS 2021 international conference held during 26-27 February, 2021 organized by Don Bosco University, Guwahati, Assam
• Delivered an invited talk at University of Science and Technology Meghalaya (USTM) 2021.
• Delivered Science Day Talk (2020) as Chief Guest in CPP-IPR, Sonapur, Guwahati
• Delivered the inaugural speech of the webinar 'A one-week Short term Online Course on Computational Physics' held from 12th  to 18th May 2020 at the Department of Physics, Boroland University, India.
• Convener of 'Guwahati Pre-Meeting on FAIR @ GSI, Darmstadt, Germany' and Late P C Mahanata memorial Lecture held during 17 & 28 Sep., 2019 at the Department of Physics, Gauhati University. the Pre-Meeting was attended by Dr. Narbert Hermann, Spokesperson, FAIR-CBM International Collaboration, Dr. Volker Friese, Dr. Christein Strume and Dr. Chriestein Schmidt all from GSI, Darmstadt, Germany. Dr. Hermann delivered the P C Mahanta memorial talk of 2019.                 
• Convener of 64th Foundation Day Lecture of Department of Physics, GU held on 21st Feb., 2018. The lecture was delivered by Dr. Volker Friese, Physics Coordinator and Computing Coordinator of FAIR-CBM experiment of GSI, Darmstadt, Germany.
• Attended International CBM-India collaboration meeting held at Bose Institute, Falta, West Bengal during 15-17 Feb., 2018 and chaired a session (Detector Session).
• Attended LHC-ALICE week at CERN, Switzerland held during 21/03/2017 to 02/04/2017. 
• Convenor of the LHC-ALICE (India) Collaboration meeting held in the Department of Physics, Gauhati University during 01/12/2016 to 03/12/2016.
• Attended LHC-ALICE Task Force meeting at BARC, Mumbai during 01/09/2016 to 04/09/2016.
• Attended LHC-ALICE (India) meeting held at Panjab University, Chandigarh during 03/08/2016 to 04/08/2016.
• Attended LHC-ALICE collaboration Board meeting at CERN Switzerland held during 04/04/2016 to 08/04/2016 
• Took part in LHC-ALICE experiment as a SHIFT LEADER at CERN, Switzerland during 24/06/2015 to 10/07/2015.
• Attended LHC-ALICE (India) meeting at Intitute of Physics, Bhubaneswar held during  22/07/2015 to 24/07/2015
• Attended ICPAQGP-2015 at Variable Energy Cyclotron Centre, Kolkata during  01/02/2015 to 06/02/2015.
• Attended LHC-ALICE Mini-week at CERN, Switzerland during 07/11/2013 to 20/11/2013. Also completed MoU siging of GU as a collaborating University with ALICE collaboration, CERN, Switzerland during this period.
• Attended LHC-ALICE collaboration meeting during 09/09/2013 to      13/09/2013 at VECC, Kolkata.
• Convener of FAIR-CBM collaboration meeting held at the Department of Physics, Gauhati University during 05/01/2012 to 07/01/2012.
• Attended FAIR-CBM collaboration meeting held at GSI, Germany during 25/03/2012 to 30/03/2012.
• Convenor of the 56th Foundation Day of the Department of Physics,    Gauhati University held on February 23, 2010.
• Attended 13th International Collaboration Meeting of CBM Experiment at FAIR, GSI, Dramstadt, Germany during March 9 – 13, 2009.
• Participated in the two days discussion meeting on 'Indian Participation in FAIR: Science and Technology' organized at Hyderabad by DST and Electronics Corporation of India Limited (ECIL), Hyderabad during April 18 – 19, 2009
• Participated and Chaired a session in the CBM India Collaboration Meeting held at the Department of Physics, BHU during December 27 – 30, 2009. 
• Presented a paper 'Di-muon measurements with the CBM experiment at FAIR' at High Energy Physics Conference  held at Department of Physics, Banaras Hindu University, Varanasi, India during Dec. 14 – 18, 2008.
• Attended CBM collaboration meeting, 13-17Feb., 2008, Jammu University, Jammu
• Presented a paper in 18th DAE-BRNS High Energy Physics Symposium, 14-18 Dec. 2008, Department of Physics, BHU, India.
• Attended 20th International Conference on Ultra-Relativistic Nucleus Nucleus Collisions, 4-10 Feb., 2008, Jaipur.
• Presented works at CBM collaboration meeting held during 30-31 July, 2007, VECC, Kolkata.
• Presented a paper in the International Europhysics Conference on HEP (EPS-HEP 2007) at the Department of Physics, Manchester University, Manchester, UK during 19-25 July, 2007.
• Convener of 5th conference of Physics Academy of the North East, 1-2 March, 2007, Gauhati University, Guwahati. 
• Presented a paper in the DAE-BRNS symposium on Nuclear Physics, 11-15 Dec., 2006, MSU, Baroda.
• Presented a paper in the Conf. on Contemporary Issues in Nucl and Part. Physics, 4-7 Feb., 2005, Jadavpur Univ., Kolkata.
• Presented a paper in the 3rd National Conf. on Contemporary Issues in Nuclear and Particle Physics, 16-17 Feb., 2004, Jadavpur Univ, Kolkata.
• Participated in UGC sponsored 8th Refresher Course in Physics, 9-28 Dec., 2003, ASC, G.U., Guwahati.
• Attended 21st Inter. Conf. on Nucl. Tracks in Solids, 21-25 Oct., 2002, New Delhi.
• Participated in UGC sponsored Orientation Course, 18/2/’02 to 17/3/’02, ASC, G.U., Guwahati.
• Participated in Orientation Program on Nuclear Physics, 08-14 Aug.2001, NSC, New-Delhi.
• Participated in Interactive Workshop on Nuclear Reaction Studies with Light Radioactive Ion Beam, 27-28 Aug., 1999, NSC, New Delhi.
• Participated in DST sponsored II SERC School in Nuclear Physics, 20/10/’97 to 8/11/’97, H.P. Univ., Shimla.
• Attended Accelerator Based Exptal. Facilities at Nuclear Science Centre, New Delhi, 23-24 June, 1995, Dept of Physics, G.U., Gwahati.
• Presented a paper in the 17th International Conf. on Nuclear Tracks in solids held at Joint Institute of Nuclear Research (JINR), Dubna, Russia during 24-28 Aug., 1994. 
• Presented a paper in 17th National Conf. on Instrumentation, 17-20 Nov., 1992, Dept of Physics, G.U., Guwahati.
• Presented a paper in 10th DAE Conf. on Nuclear Physics, 21-24 Aug., 1992, BARC, Mumbai.
• Presented a paper in 7th National Conf. on Particle Track Detector, 9-11 Oct., 1991, DRDO, Jodhpur.
• Attended Awareness Seminar on Accelerator Utilization, 10-12 July, 1991, Utkal Univ., Bhubaneswar.
• Attended Detector Development Workshop & Planned Experiment at  NSC, 11-14 Sep., 1990, Nuclear Science Centre, New Delhi.
• Presented a paper in the Annual Technical Session of Assam Science Society,  29th May, 1990, RRL, Jorhat.

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