Tim Nicolas Charissé M.Sc.
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Tim Nicolas Charissé M.Sc.
Contact:
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Education
- 2020-2024, M.Sc. in Physics
Johannes Gutenberg-Universität Mainz, Germany
Master Thesis: Directional detection of solar pp-neutrinos with Serappis - 2016-2020, B.Sc. in Physics
Johannes Gutenberg-Universität Mainz, Germany
Bachelor Thesis: Knots in experimental protein structures
Research Activity
The Diffuse Supernova Neutrino Background and JUNO (present)
The Diffuse Supernova Neutrino Background (DSNB) is the integrated signal of neutrinos emitted from all past core-collapse supernovae (SNe) in the visible universe. Studying the DSNB allows a view into astrophysical and cosmological properties like the average core-collapse SN neutrino spectrum, the fraction of failed black-hole forming SNe and cosmic star-formation rate. In JUNO I am part of the effort towards detecting the currently only theoretically predicted DSNB. More specifically I am working on the event selection of Inverse Beta Decay events, the interaction channel JUNO is utilizing to measure electron-antineutrinos from the DSNB. In the future I also plan to take part in other areas of the DSNB anaylsis.
Before JUNO started data taking I was part of a sensitivity study which investigated if the fraction of failed black-hole forming SNe could be inferred from a combined DSNB measurement by JUNO and the Super-Kamiokande experiment (see publications). I also co-supervised bachelor thesis which investigated JUNOs potential concerning directional SN detection and determination of the SN orientation via the neutrino signal, as well as cosmogenic backgrounds for the DSNB analysis.
Solar neutrinos with OSIRIS (Master thesis)
The Online Scintillator Internal Radioactivity Investigation System (OSIRIS) is a pre-detector of JUNO which monitored the radiopurity of the liquid scintilator during the filling. Now that JUNO is running and OSIRIS has completed its task, it is evaluated for an upgrade to pursue physcis goals on its own or act as a testbed for future JUNO phases.
In my master thesis I investigated if the pp-neutrino detection with an upgraded OSIRIS could be enhanced using the analysis method of Correlated and Integrated Directionality. This method utilizes the correlation of the known direction of the solar neutrinos and the direction of the Cherenkov photons produced by them in an integrated approach.
Publications:
- T. Charissé et al., Vanishing acts: Quantifying black hole formation with the DSNB signal Published in: Journal of Cosmology and Astroparticle Physics issue 05, volume 2026, 40 (May 2026).
Selected Talks:
Parallel Talk: "Studying the Diffuse Supernova Neutrino Background with JUNO"
Parallel Talk: "Combined sensitivity of JUNO and Super-K on the Black Hole Fraction"
Parallel Talk: "Detection of solar pp neutrinos with the OSIRIS upgrade"
Teaching and Supervision:
- Co-Supervision of bachelor students at Johannes Gutenberg-Universität Mainz
Summer Schools:
- Astroparticle School 2025 September 4-12, 2025 Waischenfeld, Germany
Talk: Combined Sensitivity of JUNO and Super-K on the Black-Hole Fraction