Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Instrumentation VIII

HK 27.4: Talk

Tuesday, March 29, 2022, 17:00–17:15, HK-H4

n2EDM - coating of ultra-cold neutron storage vessel — •Noah Yazdandoost für die nEDM Kollaboration — Department of Chemistry, Johannes Gutenberg-University, Mainz

The n2EDM experiment at PSI aims to measure the neutron electric dipole moment (nEDM) with ultra-cold neutrons (UCN). UCN are neutrons with energies in the range of nano electron-volts.
A non-zero nEDM would break time and parity reversal symmetry and could explain observations like the matter-antimatter asymmetry of the universe. To measure the nEDM, polarized UCN are filled into a storage vessel where a constant electric and magnetic field is applied. The Ramsey method of separated oscillatory fields is used to measure the Larmor precession frequency of the UCN in the storage vessel. A measured shift in the Larmor precession frequency between parallel and antiparallel field orientation implies a non-zero nEDM. The maximum energy of the stored UCN is limited by the Fermi pseudo-potential of the material the vessel is made of. Besides having a high Fermi pseudo-potential, the material needs to be non-magnetic and electrically insulating.
This talk gives an overview of the n2EDM experiment and the coating process of the insulating rings of the experiment.