Summary of Publications and Results of the PTOLEMY Collaboration

Publications (Newest First)

• Towards Low-Energy Electron High-Resolution Spectroscopy with Transition-Edge Sensors
  R. Ammendola et al.
  arXiv:2602.21694 (25 Feb 2026)
  Key result on TES energy resolution for low-energy electrons (~0.48 eV)
• Ultra-high precision high voltage system for PTOLEMY
  R. Ammendola et al.
  JINST 21 (2026) P04009
• Stability of highly hydrogenated monolayer graphene in ultra-high vacuum and in air
  Alice Apponi et al.
  Appl. Surf. Sci. 723, 165658 (2026)
  Long-term stability of hydrogenated graphene in UHV (relevant for tritium storage in PTOLEMY); rapid oxidation in air with recovery via atomic hydrogen exposure
• A demonstration of slowed electron E×B drift for PTOLEMY
  M. Farino et al.
  JINST 20 (2025) P08025
• β-decay spectrum of tritiated graphene: Combining nuclear quantum mechanics with density functional theory
  A. Casale et al.
  Phys. Rev. C 113, 054607 (2026)
  (This is the paper featured in the May 2026 APS Physics Viewpoint)
• Quantized Nuclear Recoil in the Search for Sterile Neutrinos in Tritium Beta Decay with PTOLEMY
  W. Chung et al.
  Universe 11(9), 297 (2025)
• Pump-Probe X-ray Photoemission Spectroscopy of Free-Standing Graphane
  R. Costantini et al.
  Condens. Matter 2023, 8(2), 31
• Gap Opening in Double-Sided Highly Hydrogenated Free-Standing Graphene
  M.G. Betti et al.
  Nano Letters 22 (7), 2971–2977 (2022)
• Implementation and optimization of the PTOLEMY transverse drift electromagnetic filter
  A. Apponi et al.
  JINST 17 (2022) P05021
• Absolute efficiency of a two-stage microchannel plate for electrons in the 30–900 eV energy range
  A. Apponi et al.
  Meas. Sci. Technol. 33 (2022) 025102
• Heisenberg’s uncertainty principle in the PTOLEMY project: A theory update
  A. Apponi et al.
  Phys. Rev. D 106, 053002 (2022)
• Multi-Messenger Astrophysics with the Cosmic Neutrino Background
  C.G. Tully and G. Zhang
  JCAP 06 (2021) 053
• High hydrogen coverage on graphene via low temperature plasma with applied magnetic field
  F. Zhao et al.
  Carbon 177, 244–251 (2021)
• Deuterium Adsorption on Free-Standing Graphene
  M.M.S. Abdelnabi et al.
  Nanomaterials 11(1), 130 (2021)
• Towards free-standing graphane: atomic hydrogen and deuterium bonding to nano-porous graphene
  M.M.S. Abdelnabi et al.
  Nanotechnology 32 (2021) 035707
• TES Microcalorimeters for PTOLEMY
  M. Rajteri et al.
  J. Low Temp. Phys. 199, 138–142 (2020)
• Neutrino Physics with the PTOLEMY project
  M.G. Betti et al.
  JCAP 07 (2019) 047
• A design for an electromagnetic filter for precision energy measurements at the tritium endpoint
  M.G. Betti et al.
  Prog. Part. Nucl. Phys. 106, 120–131 (2019)
• PTOLEMY: A Proposal for Thermal Relic Detection of Massive Neutrinos and Directional Detection of MeV Dark Matter
  E. Baracchini et al.
  arXiv:1808.01892 (2018)
• Development of a Relic Neutrino Detection Experiment at PTOLEMY
  S. Betts et al.
  arXiv:1307.4738 (2013)

Simulation & Software

• Filter and transmission function simulation (W. Chung)
• PTOLEMY fork of Kassiopeia (W. Chung)
• Lorentz4 and PtSens (N. Rossi)