Frontier Research Institute for Interdisciplinary Sciences
Tohoku University


Tenure in FRIS 2022.1-2022.3

Shuhei Obara

Assistant ProfessorAdvanced Basic Science

Mentor Information
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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