Nonstationary Diffraction of Ultracold Neutrons from a Moving Grating and Efficiency of Energy Transfer to a Neutron

Kulin, G. V.; Frank, A. I.; Zakharov, M. A.; Goryunov, S. V.; Bushuev, V. A.; Panzarella, A.; Geltenbort, P.; Jentschel, M.

doi:10.1134/s1063776119110128

Cited by 6 publications

(3 citation statements)

References 18 publications

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“…In this work, a very important result was obtained, which consists in the fact that for a given grating velocity and neutron energy, the ratio between the intensities of orders depends significantly on the depth of profile h. Therefore, abandoning the fulfillment of relation (22), it is possible to set the depth of profile h, and, together with it, parameter C, proceeding from the specific values of the grating velocity and the value of the transmitted energy. A number of predictions of work [36] were confirmed in experiments [37,38].…”

Section: Non-stationary Neutron Diffraction As a Physical Basis For E...mentioning

confidence: 70%

On the possibility of creating a UCN source on a periodic pulsed reactor

Frank¹,

Kulin²,

Rebrova³

et al. 2021

Preprint

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Section: Non-stationary Neutron Diffraction As a Physical Basis For E...mentioning

confidence: 70%

On the possibility of creating a UCN source on a periodic pulsed reactor

Frank¹,

Kulin²,

Rebrova³

et al. 2021

Preprint

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“…This property is an advantage of the proposed triangular surface relief compared to the rectangular relief considered in [36], where to reduce the absorption of neutrons by the wall, roughness satisfying the relation h R > l R , i.e., a very brittle wall relief, was required. It is noteworthy that diffraction gratings with the period l R ≈ 4 µm and depth h R ≈ 0.2 µm are already actively used for the scattering of UCNs [45,46].…”

Section: Helium Film On the Rough Surface: General Formulasmentioning

confidence: 99%

On the possibility of a significant increase in the storage time of ultracold neutrons in traps coated with a liquid helium film

Grigoriev,

Dyugaev,

Mogilyuk

et al. 2022

Preprint

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It is shown that rough inner walls of a trap of ultracold neutrons can be coated with a superfluid helium film much thicker than the depth of penetration of ultracold neutrons into helium. This coating should reduce the rate of loss of ultracold neutrons caused by absorption in the walls of the trap by orders of magnitude. It is demonstrated that triangular roughness is more efficient than rectangular for the reduction of the rate of loss of ultracold neutrons. Triangular roughness is more easily implemented technically and such diffraction gratings are fabricated industrially. Other methods are proposed to increase the thickness of the protective helium film.

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“…[44] it was argued that a simple triangular wall roughness of period 𝑙 𝑅 5 µm, as in the mass-produced diffraction gratings [45], is better than rectangular roughness to hold a shielding helium film in UCN traps. The diffraction gratings with the period 𝑙 R ≈ 4 µm and depth ℎ R ≈ 0.2 µm are already actively used for the scattering of UCNs [46,47]. However, the thickness of He film on sharp peaks of this triangular roughness remains less than 𝜅 −1 0He , which leaves 5% of wall surface insufficiently coated.…”

Section: Introductionmentioning

confidence: 99%