First observation of new effects at the set-up for searching for a neutron electric dipole moment by a crystal-diffraction method

V. V. Fedorov, E. G. Lapin, S. Y. Semenikhin, V. V. Voronin

Research output

Abstract

First observation of new effects was carried out using the set-up created for searching for a neutron electric dipole moment (EDM) by a crystal-diffraction method. For the first time the neutron dynamical Laue diffraction for the Bragg angles close to a right angle (up to 87°) was studied, using the direct diffraction beam and a thick (∼ 3.5-cm) crystal. The effect of an essential time delay of diffracting neutrons inside the crystal for Bragg angles close to 90° was experimentally observed, using a time-of-flight method. The phenomenon of neutron-beam depolarization was first experimentally observed for the case of Laue diffraction in a noncentrosymmetric α-quartz crystal. It is experimentally proved that the interplanar electric field, affecting a neutron in a crystal, maintains its value up to Bragg angles equal to 87°. These results confirm the opportunity to increase by more than an order of magnitude the sensitivity of the method to the neutron EDM, using the diffraction angles close to 90°, and give a real prospect to exceed the sensitivity of the magnetic resonance method, using ultra-cold neutrons.

Original languageEnglish
JournalApplied Physics A: Materials Science and Processing
Volume74
Issue numberSUPPL.I
DOIs
Publication statusPublished - 1 Dec 2002

Fingerprint

Electric dipole moments
electric moments
electric dipoles
Neutrons
dipole moments
Bragg angle
Diffraction
neutrons
Crystals
diffraction
crystals
cold neutrons
sensitivity
neutron beams
Neutron beams
quartz crystals
Quartz
depolarization
Depolarization
magnetic resonance

Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

Cite this

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title = "First observation of new effects at the set-up for searching for a neutron electric dipole moment by a crystal-diffraction method",
abstract = "First observation of new effects was carried out using the set-up created for searching for a neutron electric dipole moment (EDM) by a crystal-diffraction method. For the first time the neutron dynamical Laue diffraction for the Bragg angles close to a right angle (up to 87°) was studied, using the direct diffraction beam and a thick (∼ 3.5-cm) crystal. The effect of an essential time delay of diffracting neutrons inside the crystal for Bragg angles close to 90° was experimentally observed, using a time-of-flight method. The phenomenon of neutron-beam depolarization was first experimentally observed for the case of Laue diffraction in a noncentrosymmetric α-quartz crystal. It is experimentally proved that the interplanar electric field, affecting a neutron in a crystal, maintains its value up to Bragg angles equal to 87°. These results confirm the opportunity to increase by more than an order of magnitude the sensitivity of the method to the neutron EDM, using the diffraction angles close to 90°, and give a real prospect to exceed the sensitivity of the magnetic resonance method, using ultra-cold neutrons.",
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T1 - First observation of new effects at the set-up for searching for a neutron electric dipole moment by a crystal-diffraction method

AU - Fedorov, V. V.

AU - Lapin, E. G.

AU - Semenikhin, S. Y.

AU - Voronin, V. V.

PY - 2002/12/1

Y1 - 2002/12/1

N2 - First observation of new effects was carried out using the set-up created for searching for a neutron electric dipole moment (EDM) by a crystal-diffraction method. For the first time the neutron dynamical Laue diffraction for the Bragg angles close to a right angle (up to 87°) was studied, using the direct diffraction beam and a thick (∼ 3.5-cm) crystal. The effect of an essential time delay of diffracting neutrons inside the crystal for Bragg angles close to 90° was experimentally observed, using a time-of-flight method. The phenomenon of neutron-beam depolarization was first experimentally observed for the case of Laue diffraction in a noncentrosymmetric α-quartz crystal. It is experimentally proved that the interplanar electric field, affecting a neutron in a crystal, maintains its value up to Bragg angles equal to 87°. These results confirm the opportunity to increase by more than an order of magnitude the sensitivity of the method to the neutron EDM, using the diffraction angles close to 90°, and give a real prospect to exceed the sensitivity of the magnetic resonance method, using ultra-cold neutrons.

AB - First observation of new effects was carried out using the set-up created for searching for a neutron electric dipole moment (EDM) by a crystal-diffraction method. For the first time the neutron dynamical Laue diffraction for the Bragg angles close to a right angle (up to 87°) was studied, using the direct diffraction beam and a thick (∼ 3.5-cm) crystal. The effect of an essential time delay of diffracting neutrons inside the crystal for Bragg angles close to 90° was experimentally observed, using a time-of-flight method. The phenomenon of neutron-beam depolarization was first experimentally observed for the case of Laue diffraction in a noncentrosymmetric α-quartz crystal. It is experimentally proved that the interplanar electric field, affecting a neutron in a crystal, maintains its value up to Bragg angles equal to 87°. These results confirm the opportunity to increase by more than an order of magnitude the sensitivity of the method to the neutron EDM, using the diffraction angles close to 90°, and give a real prospect to exceed the sensitivity of the magnetic resonance method, using ultra-cold neutrons.

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