Sindhujha Kumaran M.Sc.

Sindhujha Kumaran M.Sc.
  • PhD student, joined September 2017 as Master student
  • Thesis Title: Geoneutrinos and Solar neutrinos with the Borexino experiment

Contact:
  • Phone: +49 2461 61 4123
  • E-mail: s.kumaran_AT_fz-juelich.de

Education

Geoneutrinos

My work on geoneutrinos concentrates on improving the "standard" selection cuts in Borexino and performing sensitivity studies. The work is the continuation of my Master's thesis. The improved selection cuts such as sophisticated cosmogenic vetoes and an increased fiducial volume helped increase the exposure of the analysis. This work along with the geological interpretations was published in 2020. The paper gives a comprehensive overview and serves as a reference for next generation liquid scintillation detectors.
A possible update of the analysis using the full dataset of Borexino and the new theoretical shapes of antineutrinos is also under study.

CNO-cycle solar neutrinos

My work for the observation and the possible measurement of CNO-cycle solar neutrinos involves monitoring the Po-210 rate in Borexino, in order to obtain the Bi-210 rate, the most important background for CNO solar neutrinos. The extraction of the Bi-210 upper limit for the first experimental evidence of CNO neutrinos was published in 2020.
Further monitoring of the Po-210 background for future measurements and a possible CNO measurement without a Bi-210 constraint are also being studied.

Directionality of Be-7 solar neutrinos

In Borexino, it is possible to study the direction of Be-7 neutrinos by studying the first few hits of an event which are rich in Cherenkov photons. My work also includes this study and the possible tuning of MC using calibration sources to accommodate the study of Cherenkov photons.

Publications

Selected events

    Contributions on Solar neutrinos

  • 17th International Conference on Topics in Astroparticle and Underground Physics (TAUP) 2021, online, Valencia, Spain: 26 August - 3 September, 2021
    Poster: Directional measurement in Borexino: Calibration of Cherenkov photons in a liquid scintillator detector using gamma sources
  • 37th International Cosmic Ray Conference, online, Berlin, Germany: 12-23 July, 2021
    Parallel talk: First direct evidence of the CNO fusion cycle in the Sun with Borexino
  • The 1st INFN International School on Underground Physics (SoUP 2021), Virtual: 28 June - 2 July, 2021
    Poster: Directionality of Be-7 solar neutrinos in Borexino
  • 55th Rencontres de Moriond, online: 20-27 March, 2021
    YSF flash talk: The Low Polonium Field of Borexino and its significance for CNO neutrino detection
  • DPG Spring Meeting 2021, online, Dortmund, Germany: 15-19 March, 2021
    Parallel talk: Bi-210 upper limit for the direct evidence of CNO solar neutrinos with Borexino
  • Neutrino 2020, online, Fermilab, USA: 22 June - 2 July, 2020
    Poster: Extraction of Bi-210 via Po-210 for CNO neutrino detection with Borexino
  • Contributions on Geoneutrinos

  • 17th International Conference on Topics in Astroparticle and Underground Physics (TAUP) 2021, online, Valencia, Spain: 26 August - 3 September, 2021
    Parallel talk: Spectroscopy of geoneutrinos with Borexino
  • Weak Interactions and Neutrinos (WIN) 2021, online, Minnesota, USA: 7-12 June, 2021
    Poster: Detecting signals from the deep Earth with Borexino
  • Neutrino geoscience 2020, Prague, Czech republic: 21-23 October, 2019
    Plenary talk: Borexino: Improvements of the latest geoneutrino results
    Poster: Analysis Strategies for the Updated Geoneutrino Measurement with Borexino
  • 16th International Conference on Topics in Astroparticle and Underground Physics (TAUP) 2019, Toyama, Japan: 9-13 September, 2019
    Poster (best poster prize): Analysis Strategies for the Updated Geoneutrino Measurement with Borexino
  • DPG Spring Meeting 2019, Aachen, Germany: 25-29 March, 2019
    Parallel talk: Updated geoneutrino measurement with the Borexino detector: Key improvements
  • Workshop on Observatory Synergies for Astroparticle physics and Geosciences, Paris, France: 11-12 February, 2019
    Poster (young scientist grant): Towards the improved geoneutrino measurement with Borexino
  • Using Particle Physics to Understand and Image the Earth, INFN, Ferrara: 2-12 July, 2018
    Participation in summer school
  • DPG Spring Meeting 2018, Wuerzburg, Germany: 19-23 March, 2018
    Parallel talk: Optimisation of selection cuts for updated geoneutrino analysis with Borexino