30 research outputs found
Search for an interaction mediated by axion-like particles with ultracold neutrons at the PSI
We report on a search for a new, short-range, spin-dependent interaction
using a modified version of the experimental apparatus used to measure the
permanent neutron electric dipole moment at the Paul Scherrer Institute. This
interaction, which could be mediated by axion-like particles, concerned the
unpolarized nucleons (protons and neutrons) near the material surfaces of the
apparatus and polarized ultracold neutrons stored in vacuum. The dominant
systematic uncertainty resulting from magnetic-field gradients was controlled
to an unprecedented level of approximately 4 pT/cm using an array of
optically-pumped cesium vapor magnetometers and magnetic-field maps
independently recorded using a dedicated measurement device. No signature of a
theoretically predicted new interaction was found, and we set a new limit on
the product of the scalar and the pseudoscalar couplings (95% C.L.) in a range of for the monopole-dipole interaction. This new result confirms
and improves our previous limit by a factor of 2.7 and provides the current
tightest limit obtained with free neutrons
Comparison of fecal culture and F57 real-time polymerase chain reaction for the detection of Mycobacterium avium subspecies paratuberculosis in Swiss cattle herds with a history of paratuberculosis
Identification of Cracking Mechanisms in Scaled FRP Reinforced Concrete Beams using Acoustic Emission
NETRALOG - Entwicklung und Einsatz bioanaloger Algorithmen in der Schiffsabfertigung Schlussbericht
Available from TIB Hannover: F01B55+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung und Forschung, Berlin (Germany)DEGerman
Sediment quality assessment of flowing waters in South-West Germany using acute and chronic bioassays
Chromosomal Studies of Two Populations of Peromyscus difficilis felipensis (Rodentia: Muridae)
Search for an interaction mediated by axion-like particles with ultracold neutrons at the PSI
We report on a search for a new, short-range, spin-dependent interaction using a modified version
of the experimental apparatus used to measure the permanent neutron electric dipole moment at
the Paul Scherrer Institute. This interaction, which could be mediated by axion-like particles,
concerned the unpolarized nucleons (protons and neutrons) near the material surfaces of the
apparatus and polarized ultracold neutrons stored in vacuum. The dominant systematic
uncertainty resulting from magnetic-field gradients was controlled to an unprecedented level of approximately 4 pT cmâ»Âč using an array of optically-pumped cesium vapor magnetometers and
magnetic-field maps independently recorded using a dedicated measurement device. No signature
of a theoretically predicted new interaction was found, and we set a new limit on the product of the
scalar and the pseudoscalar couplings gâgâλÂČ < 8.3 Ă 10â»ÂČâž mÂČ (95% C.L.) in a range of 5 ”m < λ < 25 mm for the monopoleâdipole interaction. This new result confirms and improves our previous limit by a factor of 2.7 and provides the current tightest limit obtained with free neutrons.ISSN:1367-263