Frontier Research Institute for Interdisciplinary Sciences
Tohoku University

Researcher

Past information from January 2022 to March 2022

Shuhei Obara

Assistant ProfessorAdvanced Basic Science

Mentor Information
Professor
Kunio Inoue (Graduate School of Science)
Research Fields Astro-particle physics
Research Subjects
  • Majorana neutrinos
  • Film scintillator
  • Astronomical neutrinos
Academic Society Membership -
Research Outline  

To explore the matter-antimatter asymmetry in the universe, the Majorana property of neutrinos is a key; the charge-conjugated neutrino is the same as the neutrino. In the early universe, Majorana neutrino may violate the number of particles and make a small difference between the matter and the antimatter.

Neutrinoless double-beta decay is a realistic way to test the Majorana neutrinos and is performed in the world with various detectors. KamLAND-Zen experiment searches its decay signal with using a liquid-scintillator. Currently, the liquid-scintillator is held in a nylon-based balloon, but I plan to replace the nylon to a thin scintillating film as the vessel for sensitivity improvement. Moreover, I study other practical use of the film scintillator.

I also search for the astronomical neutrinos that come from supernovae, gravitational-wave events, and so on. Because of the transparency of neutrinos, the neutrino is a powerful tool to see the inner of the steller; however, it is not so easy to detect at the Earth.

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