nEDM 2017

Critical Spin Dressing

19 Oct 2017, 10:40

25m

Harrison Hot Springs

Oral Experimental techniques (cryogenic, room temperature, crystal) ThMo2

Speaker

Mr Reza Tavakoli-Dinani (Department of Physics, Simon Fraser University)

Description

It has long been proposed [1] that spin dressing [2] could be employed to realize a highly effective helium-3 nuclear precession co-magnetometer for a neutron electric dipole moment search. The proposal requires application of an intense, continuous, and far off-resonant oscillating magnetic field in such a way that the apparent Larmor precession frequency of both species is modified. Under appropriate conditions a desirable situation known as critical dressing is anticipated: the neutron and the helium-3 nucleus (or more generally, any two spin species) are expected to behave as if they had the same gyromagnetic ratio and hence should precess at the same rate in a static magnetic field. Spin dressing has been studied in the context of the neutron [3], helium-3 [4], and a variety of other systems [5]. Critical dressing, however, has not previously been demonstrated. We will present results from recent NMR experiments in which simultaneous dressing of ${}^1$H and ${}^{19}$F nuclei is studied, and in which critical dressing is observed. Insight gleaned from these experiments is expected to inform strategies for integrating critical dressing into a neutron electric dipole moment search. [1] Phys Rep **237**, 1 (1994) [2] J Phys (France) **30**, 153 (1969) [3] Phys Rev Lett **58**, 2047 (1987) [4] e.g. Phys Rev A **85**, 3 (2012); Phys Rev C, **76**, 5: 051302, (2007); and Phys Rev C, **84**, 2: 022501, (2011) [5] e.g. Nature **471**, 83 (2011) or Nature **476**, 185 (2011)

Funding Agency

NSERC

Presentation materials

notes

Critically-dressed-system-Reza Tavakoli Dinani.mp4

Off-critical-condition-Reza-Tavakoli-Dinani.mp4

y=0.1 x=1.4 fd=1 kHz - Reza Tavakoli Dinani.mp4

y=0.2x=1.0fL=1000.0Hz.mp4

y=0.2 x=2.4.mp4

y=0.2 x=3.0.wmv

y=6.5 x=2.0.mp4