Ruprecht Karls Universität Heidelberg
Jannis Weimar homepage

Dr. Jannis Weimar

Phone +49 6221 54 19448
Room INF 226 | 03.208
Email weimar(_a)


Research Interests

Tech| Gaseous Neutron Detectors - COSMOS
Fields| Particle Physics - Atmospheric and Climate Physics

Educational background

2022 PhD in Physics
Physikalisches Institut, Heidelberg
2017 Master in Physics
Physikalisches Institut, Heidelberg
2015 Bachelor in Physics
Institute for Environmental Physics, Heidelberg

Research experience

2017 Researcher
Physikalisches Institut, Heidelberg University
2014-2015 Student researcher
Analysis of Atmospheric Water Vapor Influences for CRNS
Helmholtz Centre for Environmental Research - UFZ, Leipzig


2021 M. Köhli et al.
Soil Moisture and Air Humidity dependence of the above-ground cosmic-ray neutron intensity
Front. Water, 2, 1-15, DOI: 10.3389/frwa.2020.544847
2020 J. Weimar et al.
Large-scale boron-lined neutron detection systems as a 3He alternative for Cosmic Ray Neutron Sensing
Front. Water, 2, 1-16, DOI: 10.3389/frwa.2020.00016
2020 B. Fersch et al.
A dense network of cosmic-ray neutron sensors for soil moisture observation in a pre-alpine headwater catchment in Germany
Earth Syst. Sci. Data, 12(3), 2289-2309, DOI: 10.5194/essd-12-2289-2020
2019 D. Li et al.
Can Drip Irrigation be Scheduled with Cosmic-Ray Neutron Sensing?
Vadose Zone J., 18:190053, DOI: 10.2136/vzj2019.05.0053
2017 M. Schrön et al.
Improving calibration and validation of cosmic-ray neutron sensors in the light of spatial sensitivity
Hydrol. Earth Syst. Sci. 21, 5009-5030, DOI: 10.5194/hess-21-5009-2017
Chosen as Highlight Article in
Hydrology and Earth System Sciences
European Geosciences Union Open Access Journals
2017 T. Hüneke et al.
The novel HALO mini-DOAS instrument: Inferring trace gas concentrations from air-borne UV/visible limb spectroscopy under all skies using the scaling method
Atmos. Meas. Tech. 10(11), 4209-4234, DOI: 10.5194/amt-10-4209-2017
2015 M. Schrön et al.
Monitoring Environmental Water with Ground Albedo Neutrons and Correction for Incoming Cosmic Rays with Neutron Monitor Data
PoS (ICRC2015) 231, Link


2017 81th DPG Annual Conference, Bremen
Detection systems for neutron-based soil moisture measurements (UP 4.3)


2018 EGU General Assembly, Vienna
Boron-lined neutron detectors for mobile soil moisture measurements pdf-File

PhD thesis

2022 J. Weimar, Group Prof. U. Schmidt / S. Hansmann-Menzemer, Physikalisches Institut, Heidelberg University
Advances in Cosmic-Ray Neutron Sensing by Monte Carlo simulations and neutron detector development
pdf-File, 23 MB

Master thesis

2017 J. Weimar, Group Prof. U. Schmidt / S. Hansmann-Menzemer, Physikalisches Institut, Heidelberg University
Entwicklung und Charakterisierung eines 10B-basierten Neutronendetektionssystem zur Bestimmung von Bodenfeuchte auf der Hektarskala
pdf-File, 20 MB

Bachelor thesis

2015 J. Weimar, Group Prof. U. Platt / K. Pfeilsticker, Institute for Environmental Physics, Heidelberg University
Detektionseigenschaften der VIS Spektrometer des flugzeuggetragenen HALO mini-DOAS Instruments und deren Einfluss auf die Bestimmung von Spurengasvorkommen
pdf-File, x MB

Various Projects

O Student Researcher UFZ, Leipzig
Influence of the atmospheric water content on fast cosmic ray neutrons and its importance for the soil moisture retrieving COSMOS technique
Einfluss des atmosphärischen Wassergehalts auf die Neutronenzählrate bei der COSMOS Methode zur Bestimmung großflächiger Bodenfeuchte
pdf-File, x MB

Schools and Participations

2016 6th International COSMOS Workshop, Denmark

EDV Abteilung