New Limit on Lorentz- and CPT-Violating Neutron Spin Interactions

Journal Article · Fri Oct 08 00:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.105.151604· OSTI ID:21471028

Brown, J M; Smullin, S J; Kornack, T W; Romalis, M V ^[1]

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1. Department of Physics, Princeton University, Princeton, New Jersey 08544 (United States)

We performed a search for neutron spin coupling to a Lorentz- and CPT-violating background field using a magnetometer with overlapping ensembles of K and {sup 3}He atoms. The comagnetometer is mounted on a rotary platform for frequent reversal of its orientation. We measure sidereal oscillations in the signal to search for anomalous spin coupling of extra-solar origin. We determine the equatorial components of the background field interacting with the neutron spin to be b-tilde{sub X}{sup n}=(0.1{+-}1.6)x10{sup -33} GeV and b-tilde{sub Y}{sup n}=(2.5{+-}1.6)x10{sup -33} GeV, improving on the previous limit by a factor of 30. This measurement represents the highest energy resolution of any spin anisotropy experiment.

• OSTI ID: 21471028
• Journal Information: Physical Review Letters, Vol. 105, Issue 15; Other Information: DOI: 10.1103/PhysRevLett.105.151604; (c) 2010 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
ATOMS
COUPLING
CPT THEOREM
ENERGY RESOLUTION
GEV RANGE
HELIUM 3
LIMITING VALUES
LORENTZ INVARIANCE
MAGNETOMETERS
NEUTRONS
ORIENTATION
OSCILLATIONS
PARTICLE INTERACTIONS
SPIN
SYMMETRY BREAKING
ANGULAR MOMENTUM
BARYONS
ELEMENTARY PARTICLES
ENERGY RANGE
EVEN-ODD NUCLEI
FERMIONS
HADRONS
HELIUM ISOTOPES
INTERACTIONS
INVARIANCE PRINCIPLES
ISOTOPES
LIGHT NUCLEI
MEASURING INSTRUMENTS
NUCLEI
NUCLEONS
PARTICLE PROPERTIES
RESOLUTION
STABLE ISOTOPES