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Abstract:
Neutrinos from Galactic supernova (SN) bursts can potentially give rise to nuclear recoil (NR) signals arising from the neutral current (NC) process of coherent elastic neutrino-nucleus scattering (CE$\nu$NS) interactions of the neutrinos with xenon nuclei in future, large (tens of tonne scale) liquid xenon (LXe) detectors being employed for dark matter searches. In addition, recently it has been pointed out that the same detectors would also be sensitive to inelastic charged-current (CC) interactions of the SN electron neutrinos ($\nu_e$s) with xenon nuclei.
Such inelastic CC interactions, while creating an electron in the final state, would leave the post-interaction target nucleus in an excited state, the subsequent de-excitation of which would produce, among other particles, gamma rays and neutrons. The electron and de-excitation gamma rays would give "electron recoil" (ER) type signals, while the de-excitation neutrons the so-called "neutrino-induced neutrons" would produce, through their multiple scattering on the xenon nuclei, further xenon nuclear recoils that would also give NR signals (in addition to those produced through the CE$\nu$NS interactions). We discuss the observable scintillation and ionization signals associated with SN neutrino induced CE$\nu$NS and CC events in a generic LXe detector and argue that upcoming, sufficiently large LXe detectors should be able to detect both these types of events due to neutrinos from reasonably close-by SN bursts. We also note that since the total $\nu_e$-induced ER and NR signals receive contributions only from the CC interactions of the $\nu_e$s while the CE$\nu$NS contribution comes from
NC interactions of all the six species of neutrinos, identification of the $\nu_e$-CC and CE$\nu$NS origin events may offer the possibility of extracting useful information about the distribution of the total SN explosion energy going into different neutrino flavors.
Biography:
Education :
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* Ph.D. (Theoretical Physics) : Imperial College, London, England.
Thesis : Implications of phase transitions in the early universe
(Advisor : Prof. T.W.B. Kibble).
* M.Sc. (Physics) : Delhi University, Delhi, India.
Post-doctoral Positions :
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* March 1984 - April 1985: Physics Department, Delhi University, Delhi, India.
* May 1985 - February 1989 : Tata Institute of Fundamental Research, Mumbai, India.
* March 1989 - February 1992 : Astronomy & Astrophysics Center, Enrico Fermi Institute, University of Chicago, Chicago, USA, &NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois, USA.
Faculty positions:
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* March 1992 - October 1992 : Variable Energy Cyclotron Centre, Kolkata, India.
* November 1992 - October 2005 : Indian Institute of Astrophysics, Bangalore, India
* November 2005 - November 2021 : Saha Institute of Nuclear Physics, Kolkata
Special Fellowships/Professorships:
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* January - December 2013: The Clark way Harrison Distinguished Visiting Professor at the McDonnell Center for the Space Sciences & Physics Department, Washington University, St. Louis, MO, USA.
* January 1997 - January 1999: U. S. National Academy of Sciences (NAS)/National Research Council (NRC) Resident Senior Research Associate at the Laboratory for High Energy Astrophysics of NASA/Goddard Space Flight Center, Greenbelt, Maryland, USA.
* October 1980 - January 1984 : "1851 Exhibition Fellowship" of the "1851 Royal Commission", London, England. Worked at the Theoretical Physics Group, The Blackett Laboratory, Imperial College, London,England.
(Also held several short- and long-term visiting positions in Europe and USA).
Current areas of research :
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* Topics on the interface areas between High Energy Particle Physics and Astrophysics/Cosmology.
* Nature, distribution and observational signatures of Dark Matter.
* Physics and Astrophysics of Ultrahigh-energy (UHE) cosmic rays (CR), gamma rays and neutrinos.
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