Project description
High-precision measurements of the lowest nuclear-excited state
Thorium-229 has a remarkably low-lying metastable isomer. Due to its low excitation energy, the isomer should allow the development of a nuclear clock of unprecedented accuracy. Increasing understanding of the isomer’s properties would have far-reaching implications for metrology, dark matter research and geodesy. Funded by the Marie Skłodowska-Curie Actions programme, the RaDTho project plans to use two complementary techniques to accurately determine the isomer’s properties. Researchers will use a novel technique of producing the thorium-229 isomer via the beta decay of actinium-229, which is expected to increase sensitivity analysis fivefold. Spectroscopy techniques should also help measure the hyperfine structure of the ground state and low-energy isomer of thorium-229.
Objective
The existence of a low-lying nuclear isomer of thorium-229 at 8.28 eV was suggested several decades ago but was only recently identified via the observation of its decay signal. The low energy and an estimated relative decay width of around 10^{-19} open new possibilities for the development of a nuclear frequency standard-a nuclear clock, which can outperform the existing atomic clocks. This will have far-reaching consequences, such as in metrology, dark matter research, geodesy and time variation of fundamental constants. However, the isomer's properties are unknown or known with insufficient accuracy to exploit its far-reaching opportunities.
This proposal aims to determine the properties of the isomer using two complementary techniques.
1. The isomer is populated using a novel mechanism via the beta-decay of actinium-229 implanted in a suitable crystal at the ISOLDE-CERN facility. VUV spectrometry of the implanted crystal will allow measurement of the isomer's excitation energy with a precision of < 0.1 nm as well as its radiative-decay half-life. This production scheme increases the sensitivity by at least a factor of five and allows for improved control of experimental conditions and a reduced background signal.
2. Magnetic dipole and electric quadrupole moment as well as the nuclear charge radii of the singly charged ground state and isomer of thorium-229, produced via alpha-decay of uranium-233, will be measured using the in-gas-jet laser ionization and spectroscopy technique at KU Leuven. This technique allows the necessary efficiency, sensitivity and spectral resolution to measure the hyperfine structure of the singly charged thorium-229 ground state and isomer.
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 nuclear chemistry radiochemistry
- 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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H2020-EU.1.3. - EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions
MAIN PROGRAMME
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H2020-EU.1.3.2. - Nurturing excellence by means of cross-border and cross-sector mobility
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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.
MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)
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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) H2020-MSCA-IF-2020
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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.
3000 LEUVEN
Belgium
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.