Dhruba Gupta

Dhruba Gupta
Professor

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Previous appointments:

Postdoctoral Research Associate/CSIR Pool Officer: Variable Energy Cyclotron Centre, Kolkata, INDIA : (2006 - 2008)

Postdoctoral Research Associate/Visiting Scientist: Institut de Physique Nucleaire, IN2P3-CNRS, Universite de Paris-Sud, FRANCE : (2004 - 2006)

Postdoctoral Research Associate: University of North Carolina at Chapel Hill & Triangle Universities Nuclear Laboratory, USA : (2001 - 2004)

Research interests:

Nuclear Astrophysics


Contact:

Address: Department of Physics
Unified Academic Campus
Bose Institute
EN-80, Sector V
Bidhan Nagar
Kolkata - 700 091, India
E-Mail: dhruba[at]jcbose.ac.in
Phone: +91-33-23031167

Research:


Fig. 1 and 2: Experimental setup of IS 554 at HIE-ISOLDE, CERN, Geneva, Switzerland

Fig 3: Monte Carlo simulations for the experiment

Fig 4: Resonance state wave functions of an exotic nucleus using supersymmetric quantum mechanics



I work in the area of nuclear physics involving rare isotope beams. Presently a world-wide effort is put into pursuing rare isotope science to study nuclear structure, reactions and astrophysics. Experiments with these new isotopes will lead to a comprehensive understanding of nuclei and the origin of the elements in the universe. It is well known that there is a serious anomaly between the observed and Big Bang Nucleosynthesis predicted abundance of 7Li, known as the cosmological lithium problem. I am trying to address this issue through breakup and transfer reactions of 7Be. We would be carry- ing out an experiment at CERN, Geneva, Switzerland, in November 2018 with me as the principal investigator. This measurement at HIE-ISOLDE, CERN is immensely important to address the 7Li problem, particularly in the context of the newly conjectured light electrically neutral particles X. I also collaborated in an experiment to study n-p pairing carried out at the rare isotope beam facility GANIL, Caen, France. To complement experimental findings on unstable/unbound nuclei, we have developed a robust theoretical framework to study resonances. The resonance states and wave functions of unstable/unbound nuclei were reproduced for the first time by adopting supersymmetric quantum mechanics. The energy and width of the resonance states of the unstable 11Be and unbound 15Be nuclei obtained were in excellent agreement with experimental data. It becomes apparent that the present framework gives excellent results and is a powerful tool to theoretically complement the increasingly important accelerator based experiments with unbound nuclei. 

Publications:

Resonance state wave functions of  15Be using supersymmetric quantum mechanics

S. K. Dutta, D. Gupta, Swapan K. Saha

Phys. Lett. B 776, 464 (2018)


Study of resonance states of 11Be with isospectral bound state microscopic potential

S. K. Dutta, D. Gupta, D. Das and Swapan K. Saha

Jour. Phys. G: Nucl. Part. Phys. 41, 095104 (2014)


Deformation in 28Si* produced via 16O + 12C reaction

S. Kundu, C. Bhattacharya, S. Bhattacharya, T. K. Rana, K. Banerjee, S. Muhkopadhayay, D. Gupta, A. Dey, and R. Saha

Phys. Rev. C 87, 024602 (2013)


Study of the 1p transfer channel in the 12C + 27Al reaction at 6–7 MeV per nucleon

A. Dey, S Kundu, T K Rana, K Banerjee, C Bhattacharya, M Biswas, T K Ghosh, H Pai, G Mukherjee, J K Meena, D. Gupta, S Bhattacharya, S Mukhopadhyay, D Pandit, S R Banerjee, S. Kumar, A Chatterjee, K Ramachandran, K Mahata, S Santra and S Pandit

Phys. Scr. T150, 014011 (2012)


Onset of deformation at N = 112 in Bi nuclei

H. Pai, G. Mukherjee, R. Raut, S. K. Basu, A. Goswami, S. Chanda, T. Bhattacharjee, S. Bhattacharyya, C. Bhattacharya, S. Bhattacharya, S. R. Banerjee, S. Kundu, K. Banerjee, A. Dey, T. K. Rana, J. K. Meena, D. Gupta, S. Mukhopadhyay, Srijit Bhattacharya, Sudeb Bhattacharya, S. Ganguly, R. Kshetri, and M. K. Pradhan

Phys. Rev. C 85, 064317 (2012)


Complex-fragment emission in low-energy light-ion reactions

S. Kundu, C. Bhattacharya, K. Banerjee, T. K. Rana, S. Bhattacharya, A. Dey, T. K. Ghosh, G. Mukherjee, J. K. Meena, P. Mali, S. Mukhopadhyay, D. Pandit, H. Pai, S. R. Banerjee, D. Gupta, P. Banerjee, Suresh Kumar, A. Shrivastava, A. Chatterjee, K. Ramachandran, K. Mahata, S.K. Pandit, and S. Santra

Phys. Rev. C 85, 064607 (2012)


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Recognition:

    Teaching:

    1) Methods in Physics - PhD coursework of Bose Institute (2014 - present)  

    2) Nuclear Physics - Int. M.Sc-Ph.D coursework of Bose Institute and Univ. of Calcutta (2014 - present)

    3) Nuclear Physics, Advanced Experiments I - M. Sc. coursework of St. Xavier's College and Bose Institute (2008 - 2014)


    Students:

    Image Name Designation Department Campus Contact number Email
    profile image Mustak Ali Senior Research Fellow Physics Unified 23031167 mustak
    profile image Sahanaj Aktar Banu Junior Research Fellow Physics Main 23031167 sahanaj
    profile image Subhankar Maity Junior Research Fellow Physics Main 23031167 subhankar

    Former:

    Dr. Mandira Sinha, Research Associate

    Ms. Kabita Kundalia, Research Scholar

    Mr. Mustak Ali, Research Scholar

    Mr. Subhankar Maity, Research Scholar

    Ms. Sahanaj Aktar Banu, Research Scholar

    Group News:

    Recent significant work with relevant publications:


    Search for higher excited states of 8Be* to study the cosmological 7Li problem:

    Serious discrepancy in primordial abundance of 7Li exists between observation and Big Bang

    Nucleosynthesis prediction using ηbWMAP in contrast to abundances of  2H,3,4He. This remains as 

    one of the important unresolved problems. HIE-ISOLDE facility at CERN, Geneva, Switzerland  gives unique opportunity to test it with higher 7Be beam energy and intensity. Experiment   proposed by us will be done at CERN-HIE-ISOLDE. This is the first Indian project  approved (IS 554) at  HIE-ISOLDE. Detailed Geant4 simulations are underway.

    D. Gupta, S. K. Saha, CERN ISOLDE workshop (2013, 2014, 2015, 2016)


    Study of n-p pairing through two-nucleon transfer reactions: To understand n-p pairing 

    correlations we collaborated in an experiment at GANIL, Caen, France involving n-p transfer reactions on two nuclei: 48Cr, which is a candidate for n­‐p pairing correlations, and the doubly magic nucleus 56Ni which will not show any pairing effects. This will also help to understand the appearance of new magic numbers 6 and 14 far from stability. Data analysis is in progress.


    Study of resonance states of exotic nuclei: We generated an isospectral potential starting from the DDM3Y effective interaction to study quasi bound states of exotic nuclei for the first time. This resulted in an accurate determination of energy and width of resonance states. 

    S K Dutta, D. Gupta, D. Das, S. K. Saha, Jour. Phys. G: Nucl. Part. Phys. 41, 095104 (2014)

                                                              S K Dutta, D. Gupta, D. Das, S. K. Saha,  Phys. Lett. B  776, 464 (2018)