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NEDM SIGNED

The Neutron Electric Dipole Moment: pushing the precision to understand the matter-antimatter asymmetry

Total Cost €

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EC-Contrib. €

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Partnership

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Project "NEDM" data sheet

The following table provides information about the project.

Coordinator
UNIVERSITE GRENOBLE ALPES 

There are not information about this coordinator. Please contact Fabio for more information, thanks.

 Coordinator Country France [FR]
 Total cost 1˙498˙840 €
 EC max contribution 1˙498˙840 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2016-STG
 Funding Scheme ERC-STG
 Starting year 2017
 Duration (year-month-day) from 2017-04-01   to  2022-03-31

 Partnership

Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    UNIVERSITE GRENOBLE ALPES FR (GRENOBLE) coordinator 1˙498˙840.00
2    UNIVERSITE GRENOBLE ALPES FR (SAINT MARTIN D'HERES) coordinator 0.00

Map

 Project objective

The existence of a permanent electric dipole moment (EDM) of the neutron, or any subatomic particle, would have far reaching implications connecting particle physics with cosmology. Time reversal invariance and CP symmetry would be violated. A new fundamental interaction producing the EDM, that is, deforming the charge distribution inside the neutron, could also have generated the matter-antimatter asymmetry in the early Universe. After 60 years of evolution, techniques to measure the neutron EDM are now so evolved that experiments are sensitive to microphysics associated with an energy scale beyond that accessible at the LHC. This situation offers a high likelihood of discovery for the next generation of experiments. In the same time, any improvement in precision is technically challenging. The control of the magnetic field must surpass that of the state of the art of atomic magnetometers. The n2EDM project aims at improving the precision by an order of magnitude or more. Systematic effects need to be controlled at an unprecedented level. In particular, the use of a mercury co-magnetometer based on the precession of 199Hg spins induces a set of subtle false effects due to the relativistic motional field. I propose to initiate a comprehensive program to master these systematic effects beyond the current research program. In particular, the proposed project includes a precise determination of the 199Hg magnetic moment with a precision of 0.1 ppm. To this end, I will attempt a novel approach: combining mercury and 4He magnetometry in the same cell. As a by-product, this will also produce an improved determination of the neutron magnetic moment, a quantity of interest for metrology. The cross-check I propose will prove that all disturbances on the neutron or mercury spins are mastered at the sub-ppm level, a decisive step in the quest for the neutron EDM.

 Publications

year authors and title journal last update
List of publications.
2019 Abel, C.; Ayres, N.J.; Ban, G.; Bison, G.; Bodek, K.; Bondar, V.; Chanel, E.; Chiu, P.-J.; Clement, B.; Crawford, C.; Daum, M.; Emmenegger, S.; Flaux, P.; Ferraris-Bouchez, L.; Griffith, W.C.; Grujić, Z.D.; Harris, P.G.; Heil, W.; Hild, N.; Kirch, K.; Koss, P.A.; Kozela, A.; Krempel, J.; Lauss, B.; Lefort, T.; Lemière, Y.; Leredde, A.; Mohanmurthy, P.; Naviliat-Cuncic, O.; Pais, D.; Piegsa, F.M.
The n2EDM experiment at the Paul Scherrer Institute
published pages: , ISSN: , DOI: 10.1051/epjconf/201921902002
International Workshop on Particle Physics at Neutron Sources 2018, May 2018, Grenoble, France 1 2020-04-08
2019 Abel, C.; Ayres, N. J.; Ban, G.; Bison, G.; Bodek, K.; Bondar, V.; Chanel, E.; Chiu, P. -J.; Daum, M.; Emmenegger, S.; Ferraris-Bouchez, L.; Flaux, P.; Harris, W. C. Griffith P. G.; Hild, N.; Kermaidic, Y.; Kirch, K.; Koss, P. A.; Krempel, J.; Lauss, B.; Lefort, T.; Lemiere, Y.; Leredde, A.; Mohanmurthy, P.; Musgrave, M.; Naviliat-Cuncic, O.; Pais, D.; Piegsa, F. M.; Pignol, G.; Rawlik, M.; Rebrey
nEDM experiment at PSI: data-taking strategy and sensitivity of the dataset
published pages: , ISSN: , DOI: 10.1051/epjconf/201921902001
2 2020-04-08
2019 C. Abel, N. J. Ayres, T. Baker, G. Ban, G. Bison, K. Bodek, V. Bondar, C. B. Crawford, P.-J. Chiu, E. Chanel, Z. Chowdhuri, M. Daum, B. Dechenaux, S. Emmenegger, L. Ferraris-Bouchez, P. Flaux, P. Geltenbort, K. Green, W. C. Griffith, M. van der Grinten, P. G. Harris, R. Henneck, N. Hild, P. Iaydjiev, S. N. Ivanov, M. Kasprzak, Y. Kermaidic, K. Kirch, H.-C. Koch, S. Komposch, P. A. Koss, A. Kozela,
Magnetic-field uniformity in neutron electric-dipole-moment experiments
published pages: , ISSN: 1094-1622, DOI: 10.1103/PhysRevA.99.042112
Physical Review A 99/4 2020-04-08
2019 Klassen, W.; Martin, J.W.; Pignol, G.
Wigner–Eckart theorem and the false EDM of $^{199}$Hg
published pages: , ISSN: 0168-9002, DOI: 10.1016/j.nima.2019.01.019
Nucl.Instrum.Meth.A 1 2020-04-08
2019 Pignol, G.
A magic magnetic field to measure the neutron electric dipole moment
published pages: , ISSN: 0370-2693, DOI: 10.1016/j.physletb.2019.05.014
Physics Letters B 1 2020-04-08

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