Why very cold neutrons could be useful for neutron-antineutron oscillation searches

Nesvizhevsky, V. V.

doi:10.3233/jnr-220003

Cited by 9 publications

(8 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fact is that any new method is of interest only if it is actively used in practice. At the moment, the applicability of the method of nanodiamond reflectors of slow neutrons has already been convincingly proven; some specific projects have already been proposed [ 32 , 78 , 79 ], but they have not yet been implemented.…”

Section: Projects To Use Nd Reflectors To Enhance Vcn and Cn Fluxesmentioning

confidence: 99%

“…The design of reflectors of such neutrons based on NDs can significantly increase VCN/CN fluxes and expand the scope of such neutrons for solving applied and fundamental problems. In particular, some of these topics were recently mentioned when discussing particle physics at the European Spallation Source in Lund, Sweden [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Powders of Diamond Nanoparticles as a Promising Material for Reflectors of Very Cold and Cold Neutrons

Lychagin,

Dubois,

Nesvizhevsky

2024

Nanomaterials

Self Cite

View full text Add to dashboard Cite

More than 15 years ago, the study of nanodiamond (ND) powders as a material for designing reflectors of very cold neutrons (VCNs) and cold neutrons (CNs) began. Such reflectors can significantly increase the efficiency of using such neutrons and expand the scope of their application for solving applied and fundamental problems. This review considers the principle of operation of VCN and CN reflectors based on ND powders and their advantages. Information is presented on the performed experimental and theoretical studies of the effect of the size, structure, and composition of NDs on the efficiency of reflectors. Methods of chemical and mechanical treatments of powders in order to modify their chemical composition and structure are discussed. The aim is to avoid, or at least to decrease, the neutron inelastic scatterers and absorbers (mainly hydrogen atoms but also metallic impurities and nitrogen) as well as to enhance coherent elastic scattering (to destroy ND clusters and sp2 carbon shells on the ND surface that result from the preparation of NDs). Issues requiring further study are identified. They include deeper purification of NDs from impurities that can be activated in high radiation fluxes, the stability of NDs in high radiation fluxes, and upscaling methods for producing larger quantities of ND powders. Possible ways of solving these problems are proposed.

show abstract

Section: Projects To Use Nd Reflectors To Enhance Vcn and Cn Fluxesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Powders of Diamond Nanoparticles as a Promising Material for Reflectors of Very Cold and Cold Neutrons

Lychagin,

Dubois,

Nesvizhevsky

2024

Nanomaterials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Additionally, a judicious design of the geometry of ND reflectors, inserted in a hybrid liquid-solid D 2 moderator, could enhance the VCN generation at the source and its transport towards the instruments. This concept proposed by Nesvizhevsky [38], will also be explored in the second half of the HighNESS project.…”

Section: Combined Use Of Dedicated Vcn Moderator and Advanced Reflectorsmentioning

confidence: 99%

Very cold and ultra cold neutron sources for ESS

Zanini

Dian

DiJulio

et al. 2023

JNR

View full text Add to dashboard Cite

The goal of the “Workshop on Very Cold and Ultra Cold Neutron Sources for ESS” was to discuss scientific cases, ideas and possibilities for the implementation of sources of Very Cold and Ultra Cold neutrons at the European Spallation Source. The ESS facility, presently under construction, offers several possibilities for in-pile UCN or VCN sources, in primis thanks to the available space below the spallation target where additional neutron sources can be placed to complement those above the target. Neutron beams can be extracted over a wide angular range with a grid of forty-two beamports with 6° average angular separation, allowing future instruments to be installed which may view either the upper or lower moderator systems. Of greatest interest for fundamental physics is the so-called Large Beamport foreseen for the NNBAR experiment. This beamport is also particularly well suited to feed a UCN source, for which several ideas were presented that employ either superfluid helium or solid deuterium as established neutron converter materials. Concepts for VCN sources make use of novel materials for VCN production and/or advanced reflectors to increase yields in the coldest part of the neutron spectrum from a cryogenic neutron source. In this paper we discuss these ideas and the possible locations of UCN and VCN sources at ESS.

show abstract

“…DND powders can diffusively reflect VCNs at any angle of incidence [ 9 , 10 , 11 , 12 ] and can reflect CNs quasi-specularly at small angles of incidence [ 13 , 14 , 15 ]. The potential applications of these phenomena in neutron technologies and experiments [ 16 , 17 , 18 , 19 , 20 ] and the properties of such reflectors [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ] are being actively studied. In addition, DND reflectors are being integrated into standard neutron simulation packages [ 28 , 29 , 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanodiamond Sizes on the Efficiency of the Quasi-Specular Reflection of Cold Neutrons

et al. 2023

Self Cite

View full text Add to dashboard Cite

Nanomaterials can intensively scatter and/or reflect radiation. Such processes and materials are of theoretical and practical interest. Here, we study the quasi-specular reflections (QSRs) of cold neutrons (CNs) and the reflections of very cold neutrons (VCNs) from nanodiamond (ND) powders. The fluorination of ND increased its efficiency by removing/replacing hydrogen, which is otherwise the dominant cause of neutron loss due to incoherent scattering. The probability of the diffuse reflection of VCNs increased for certain neutron wavelengths by using appropriate ND sizes. Based on model concepts of the interaction of CNs with ND, and in reference to our previous work, we assume that the angular distribution of quasi-specularly reflected CNs is narrower, and that the probability of QSRs of longer wavelength neutrons increases if we increase the characteristic sizes of NDs compared to standard detonation nanodiamonds (DNDs). However, the probability of QSRs of CNs with wavelengths below the cutoff of ~4.12 Å decreases due to diffraction scattering on the ND crystal lattice. We experimentally compared the QSRs of CNs from ~4.3 nm and ~15.0 nm ND. Our qualitative conclusions and numerical estimates can help optimize the parameters of ND for specific practical applications based on the QSRs of CNs.

show abstract

Why very cold neutrons could be useful for neutron-antineutron oscillation searches

Cited by 9 publications

References 28 publications

Powders of Diamond Nanoparticles as a Promising Material for Reflectors of Very Cold and Cold Neutrons

Powders of Diamond Nanoparticles as a Promising Material for Reflectors of Very Cold and Cold Neutrons

Very cold and ultra cold neutron sources for ESS

Effect of Nanodiamond Sizes on the Efficiency of the Quasi-Specular Reflection of Cold Neutrons

Contact Info

Product

Resources

About