Search for macroscopic CP violating forces using a neutron EDM spectrometer

Serebrov, A. P.; Zimmer, O.; Geltenbort, P.; Fomin, A. K.; Иванов, С. Н.; Kolomensky, E. A.; Krasnoshekova, I.; Lasakov, M. S.; Lobashev, V.M.; Pirozhkov, A. N.; Varlamov, V. E.; Vasiliev, A. V.; Zherebtsov, O. M.; Aleksandrov, E. B.; Dmitriev, S. P.; Dovator, N. A.

doi:10.1134/s0021364010010029

Cited by 42 publications

(28 citation statements)

References 9 publications

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“…The emergent discussion for dark matter and dark energy triggered further use of UCNs to search for exotic physics beyond the Standard Model of particle physics, like searches for mirror matter [34][35][36], for Lorentz violation effects [37], for exotic interactions induced by axionlike particles [38][39][40][41][42], dark matter [43,44], or probing dark energy [45][46][47]. The sensitivities of all such UCN experiments depend directly on the total UCN statistics available in the measurement, hence on high UCN densities in sizeable storage vessels.…”

Section: Introductionmentioning

confidence: 99%

Comparison of ultracold neutron sources for fundamental physics measurements

et al. 2017

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Ultracold neutrons (UCNs) are key for precision studies of fundamental parameters of the neutron and in searches for new CP violating processes or exotic interactions beyond the Standard Model of particle physics. The most prominent example is the search for a permanent electric dipole moment of the neutron (nEDM). We have performed an experimental comparison of the leading UCN sources currently operating. We have used a 'standard' UCN storage bottle with a volume of 32 liters, comparable in size to nEDM experiments, which allows us to compare the UCN density available at a given beam port.

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Section: Introductionmentioning

confidence: 99%

Comparison of ultracold neutron sources for fundamental physics measurements

et al. 2017

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“…A method not relying on spatial quantum states of the neutron employs spin precession of trapped UCNs close to a heavy mirror [25]. The sensitivity of the GRS experiment was almost as good as a first search of that latter type [26] and recently much improved [27], still with potential for large further gains in sensitivity. For the gravity experiment too, a large gain is still to be expected, notably once an adaptation of Ramsey's molecular beam technique of separated oscillatory fields to GRS is implemented [28].…”

Section: Introductionmentioning

confidence: 99%

Neutrons on a surface of liquid helium

et al. 2016

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We investigate the possibility of ultracold neutron (UCN) storage in quantum states defined by the combined potentials of the Earth's gravity and the neutron optical repulsion by a horizontal surface of liquid helium. We analyse the stability of the lowest quantum state, which is most susceptible to perturbations due to surface excitations, against scattering by helium atoms in the vapor and by excitations of the liquid, comprised of ripplons, phonons and surfons. This is an unusual scattering problem since the kinetic energy of the neutron parallel to the surface may be much greater than the binding energies perpendicular. The total scattering time constant of these UCNs at 0.7 K is found to exceed one hour, and rapidly increasing with decreasing temperature. Such low scattering rates should enable high-precision measurements of the scheme of discrete energy levels, thus providing improved access to short-range gravity. The system might also be useful for neutron β-decay experiments. We also sketch new experimental concepts for level population and trapping of UCNs above a flat horizontal mirror.

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“…For some of the other limits on these parameters, we refer the reader to Refs. [64,[98][99][100][101][102][103][104][105][106][107].…”

Section: Section Ii: Comagnetometer Experimentsmentioning

confidence: 99%

Nuclear spin-dependent interactions: searches for WIMP, axion and topological defect dark matter, and tests of fundamental symmetries

Stadnik

Flambaum

2015

Eur. Phys. J. C

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We calculate the proton and neutron spin contributions for nuclei using semi-empirical methods, as well as a novel hybrid ab initio/semi-empirical method, for interpretation of experimental data. We demonstrate that corepolarisation corrections to ab initio nuclear shell model calculations generally reduce discrepancies in proton and neutron spin expectation values from different calculations. We derive constraints on the spin-dependent P,T-violating interaction of a bound proton with nucleons, which for certain ranges of exchanged pseudoscalar boson masses improve on the most stringent laboratory limits by several orders of magnitude. We derive a limit on the CPT and Lorentzinvariance-violating parameter |b p ⊥ | < 7.6 × 10 −33 GeV, which improves on the most stringent existing limit by a factor of 8, and we demonstrate sensitivities to the parametersd p ⊥ andg p D⊥ at the level ∼10 −29 -10 −28 GeV, which is a one order of magnitude improvement compared to the corresponding existing sensitivities. We extend previous analysis of nuclear anapole moment data for Cs to obtain new limits on several other CPT and Lorentz-invariance-violating parameters: |b p 0 | < 7×10 −8 GeV, |d p 00 | < 8×10 −8 , |b n 0 | < 3×10 −7 GeV and |d n 00 | < 3 × 10 −7 .

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Search for macroscopic CP violating forces using a neutron EDM spectrometer

Cited by 42 publications

References 9 publications

Comparison of ultracold neutron sources for fundamental physics measurements

Comparison of ultracold neutron sources for fundamental physics measurements

Neutrons on a surface of liquid helium

Nuclear spin-dependent interactions: searches for WIMP, axion and topological defect dark matter, and tests of fundamental symmetries

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