Objective
Despite decades of progress, the particle nature of dark matter (DM) remains still unknown. Dual-phase liquid xenon (LXe) time projection chambers (TPCs) excluded large regions of GeV-scale DM parameter space thanks to their excellent self-shielding against external backgrounds, low energy thresholds, and high energy resolution. The same properties make LXe TPCs sensitive to other rare-event phenomena, like neutrinoless double beta decay (0νββ) of 136Xe or solar neutrinos. Building on this success, the XLZD collaboration aims to construct a next-generation LXe observatory with a target mass of 60–80 t , to probe this parameter space down to the neutrino fog.
With no confirmed DM signal, attention has extended also to MeV–GeV scale DM candidates motivated by theories beyond the Standard Model, such as asymmetric DM. However, the large nuclear mass of xenon limits sensitivity in this regime due to unfavorable recoil kinematics. The HydroX collaboration proposes percent-level doping of LXe with H2 introducing light scattering targets while preserving the background rejection power and scalability of LXe TPCs. In addition to enabling sensitivity to sub-GeV DM, H2-doping is expected to enhance event topology discrimination by increasing electron drift velocity and reducing longitudinal diffusion, offering potential benefits for 0νββ and neutrino searches.
Given that no published measurements of H-doped LXe exists, XLZD-NixeH aims to systematically investigate the impact of H2-doping on LXe by leading the UK effort of HydroX. Key objectives are: (O1) characterization of electron transport and charge/light yield modifications; (O2) measurement of proton recoil responses relative to xenon nuclear recoils; and (O3) development of machine-learning-based reconstruction techniques for high-energy electron tracks with and without H2 doping. These studies will significantly contribute to HydroX and the feasibility of H2-doping of current and future LXe observatories.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences chemical sciences inorganic chemistry noble gases
- natural sciences physical sciences theoretical physics particle physics neutrinos
- social sciences sociology social issues social inequalities
- natural sciences physical sciences astronomy astrophysics dark matter
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Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA)
MAIN PROGRAMME
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Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships
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Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
(opens in new window) HORIZON-MSCA-2025-PF
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Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.
SW7 2AZ London
United Kingdom
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.