Apeksha Singhal M.Sc.

Apeksha Singhal M.Sc.
  • PhD student, joined December 2020 (previously as a master student from November 2019)
  • Thesis Title: Solar neutrinos and next generation neutrino experiments

Contact:
  • Phone: +49 2461 61 4123
  • E-mail: apeksha.singhal_AT_rwth-aachen.de

Education

Research Activity: Borexino

CNO solar neutrinos

My work concentrates towards the preparation of data and Monte Carlo inputs for multivariate spectral fit, performing the fits and the determination of 210Bi constraint parameters for the updated CNO solar neutrinos measurement with 210Bi constraint. The contributions are used for this publication. In addition to this, I am also responsible for preparation of data and Monte Carlo inputs for the possible CNO solar neutrinos measurement without 210Bi constraint.

During my Master's thesis, I was involved in the first experimental evidence of CNO solar neutrinos. The contributions from the thesis were used for the publication in Nature.

Directionality of solar neutrinos

For the first time, the directional measurement of sub-MeV solar neurinos has been achieved in a liquid scintillator detector, using first few hits due to Cherenkov light emission from an event with the Borexino Experiment. My work regarding this analysis includes the optimisation of fit parameters, the study of directional distribution of backgrounds using the toy Monte Carlo simulations and the evaluation of associated systematic contributions. These contributions were used for these publications: short letter and a long article. Currently, the application of this method in the spectral fit is being studied.

Research Activity: JUNO

I have been involved in the JUNO's sensitivty towards the measurement of Be7, pep and CNO solar neutrinos. My contributions are the estimation of reactor anti-neutrino background rate and doing the spectral fits to estimate the precision of rates of Be7, pep and CNO solar neutrinos that can be reached in the presence of different level of background contaminations in JUNO detector.

Teaching

Tutor for Elementary Particle Physics II for Master Students, RWTH Aachen University (2021): Neutrino Physics

Publications

  • S. Appel et al., "Improved measurement of solar neutrinos from the Carbon-Nitrogen-Oxygen cycle by Borexino and its implications for the Standard Solar Model", arXiv:2205.15975 (2022).
  • M. Agostini et al., Independent determination of the Earth's orbital parameters with solar neutrinos in Borexino, arXiv:2204.07029 (2022).
  • M. Agostini et al. (Borexino Collaboration), "First Directional Measurement of sub-MeV Solar Neutrinos with Borexino", Phys. Rev. Lett. 128 (2022) 091803.
  • M. Agostini et al. (Borexino Collaboration), "Correlated and Integrated Directionality for sub-MeV solar neutrinos in Borexino", Phys. Rev. D 105 (2022) 052002.
  • M. Agostini et al. (Borexino Collaboration), "Search for Low-Energy Signals from Fast Radio Bursts with the Borexino Detector", Eur. Phys. Journal C 82 (2022) 278.
  • M. Agostini et al. (Borexino Collaboration), "Identification of the cosmogenic 11C background in large volumes of liquid scintillators with Borexino", Eur. Phys. J. C (2021) 81:1075.
  • M. Agostini et al. (Borexino Collaboration), "Experimental evidence of neutrinos produced in the CNO fusion cycle in the Sun", Nature 587, p 577–582(2020).
  • Proceedings

  • A. Singhal et al. (Borexino Collaboration), Understanding the systematic effects for the directional detection of sub-MeV solar neutrinos with Borexino, J. Phys.: Conf. Ser. (TAUP 2021) 2156 012202
  • ResearchGate
    ORCID

    Talks and Posters

  • Matter and the Universe 2022, GSI, Darmstadt: 20-21 October, 2022
    Flash talk: Recent results from Borexino: measurement of CNO solar neutrinos and directionality of sub-MeV solar neutrinos
  • IKP-Seminar, Forschungszentrum Jülich, Germany: July 18, 2022
    Seminar talk: Update on ongoing CNO analysis with Borexino
  • International Research Network Neutrino meeting, Annecy, France: 29-30 June, 2022
    Parallel talk: Recent results from Borexino: measurement of CNO solar neutrinos and directionality of sub-MeV solar neutrinos
  • IKP-Seminar, Forschungszentrum Jülich, Germany: June 27, 2022
    Seminar talk: Updated CNO solar neutrino measurement with Borexino: analysis strategy and implication on solar physics
  • Neutrino 2022, Seoul, South Korea (online): 30 May - 4 June, 2022
    Poster: First directional measurement of sub-MeV solar neutrinos in the liquid scintillator detector by Borexino
  • DPG Spring Meeting 2022, Heidelberg, Germany (online): 20-25 March, 2022
    Parallel talk: Analysis strategies used in the directional analysis of sub-MeV solar neutrinos in a liquid scintillator detector
  • IKP-Seminar, Forschungszentrum Jülich, Germany: October 11, 2021
    Seminar talk: First directional measurement of sub-MeV solar neutrinos in a liquid scintillator detector
  • LXXI International conference "NUCLEUS – 2021. Nuclear physics and elementary particle physics. Nuclear physics technologies", St. Petersburg, Russia (online): 20-25 September, 2021:
    Plenary talk: First experimental proof of CNO fusion cycle in Sun with the Borexino Experiment
  • Physics in Collision 2021, Aachen, Germany: 14-17 September, 2021:
    Poster: First directional detection of sub-MeV solar neutrinos in the liquid scintillator detector by Borexino
  • 17th International Conference on Topics in Astroparticle and Underground Physics (TAUP) 2021, Valencia, Spain (online): 26 August - 3 September, 2021
    Poster: Understanding the systematic effects for the directional measurement of Be-7 solar neutrinos with Borexino
  • DPG Spring Meeting 2021, Dortmund, Germany (online): 15-19 March, 2021:
    Parallel talk: Strategy used in CNO solar neutrinos analysis with the Borexino Experiment
  • Schools

  • INFN School of Statistics 2022, Paestum, Italy: 15-30 May, 2022.