Experimental determination of gadolinium scattering characteristics in neutron reflectometry with reference layer

Nikova, E. S.; Salamatov, Yuri; Кравцов, Е. А.; Боднарчук, В. И.; Ustinov, V. V.

doi:10.1016/j.physb.2018.09.033

Cited by 10 publications

(2 citation statements)

References 8 publications

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“…The formula used for the antineutron-nucleus reflectivity deviates strongly from the usual Fresnel shape familiar from light optics due to the very large effect of the imaginary part of the antineutron optical potential. The accuracy of the neutron reflectivity formula in this extreme limit has been verified by neutron reflectometry measurements on gadolinium, which is an element with two isotopes that possess a very high neutron absorption cross section comparable in size to that possessed by antineutrons [202,203]. It would also be very interesting to test theoretical calculations of nbar-A scattering amplitudes with data from slow antiprotons (there is essentially no hope to get slow antineutrons for scattering experiments) as long as theory can handle the Coulomb corrections to extract the nuclear component of the scattering from the data.…”

Section: Future Directionsmentioning

confidence: 92%

New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source

Addazi

Anderson

Ansell

et al. 2021

J. Phys. G: Nucl. Part. Phys.

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The violation of baryon number, B , is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the Universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron–antineutron oscillation ( n → n ̄ ) via mixing, neutron–antineutron oscillation via regeneration from a sterile neutron state ( n → [ n ′ , n ̄ ′ ] → n ̄ ), and neutron disappearance (n → n′); the effective Δ B = 0 process of neutron regeneration ( n → [ n ′ , n ̄ ′ ] → n ) is also possible. The program can be used to discover and characterize mixing in the neutron, antineutron and sterile neutron sectors. The experiment addresses topical open questions such as the origins of baryogenesis and the nature of dark matter, and is sensitive to scales of new physics substantially in excess of those available at colliders. A goal of the program is to open a discovery window to neutron conversion probabilities (sensitivities) by up to three orders of magnitude compared with previous searches. The opportunity to make such a leap in sensitivity tests should not be squandered. The experiment pulls together a diverse international team of physicists from the particle (collider and low energy) and nuclear physics communities, while also including specialists in neutronics and magnetics.

show abstract

Section: Future Directionsmentioning

confidence: 92%

New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source

Addazi

Anderson

Ansell

et al. 2021

J. Phys. G: Nucl. Part. Phys.

View full text Add to dashboard Cite

show abstract

“…The formula used for the antineutron-nucleus reflectivity deviates strongly from the usual Fresnel shape familiar from light optics due to the very large effect of the imaginary part of the antineutron optical potential. The accuracy of the neutron reflectivity formula in this extreme limit has been verified by neutron reflectometry measurements on gadolinium, which is an element with two isotopes that possess a very high neutron absorption cross section comparable in size to that possessed by antineutrons [201,202]. It would also be very interesting to test theoretical calculations of nbar-A scattering amplitudes with data from slow antiprotons (there is essentially no hope to get slow antineutrons for scattering experiments) as long as theory can handle the Coulomb corrections to extract the nuclear component of the scattering from the data.…”

Section: Future Directionsmentioning

confidence: 92%

New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the European Spallation Source

Addazi,

Anderson,

Ansell

et al. 2020

Preprint

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The violation of Baryon Number, B, is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source (ESS) to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron-antineutron oscillation (n → n) via mixing, neutron-antineutron oscillation via regeneration from a sterile neutron state (n → [n , n ] → n), and neutron disappearance (n → n ); the effective ∆B = 0 process of neutron regeneration (n → [n , n ] → n) is also possible. The program can be used to discover and characterise mixing in the neutron, antineutron, and sterile neutron sectors. The experiment addresses topical open questions such as the

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Magnetic and crystal structure of the antiferromagnetic skyrmion candidate GdSb0.71Te1.22

Plokhikh

Fabelo

Prodan

et al. 2023

Journal of Alloys and Compounds

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Experimental determination of gadolinium scattering characteristics in neutron reflectometry with reference layer

Cited by 10 publications

References 8 publications

New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source

New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source

New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the European Spallation Source

Magnetic and crystal structure of the antiferromagnetic skyrmion candidate GdSb0.71Te1.22

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