Neutron interference from a split-crystal interferometer

Lemmel, Hartmut; Jentschel, M.; Abele, H.; Lafont, F.; Guérard, B.; Sasso, C.P.; Mana, Giovanni; Massa, Enrico

doi:10.1107/s1600576722006082

Cited by 9 publications

(8 citation statements)

References 30 publications

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“…For instance, when 0 /w 0 → 0 (that is, the source is completely incoherent), the coherence length at the detection plane is D = 4z (K z w 0 ), see (14b). Therefore, reducing the source radius w 0 increases the contrast, as it is reported in [16,42].…”

Section: Fringe Contrastmentioning

confidence: 57%

“…The proof-of-principle demonstration that the alignment and operation of a split-crystal interferometer with the accuracy required for neutron interference are technically possible [16,17] prompts the design of split-crystal skewsymmetric interferometers operating with both x-rays and neutrons and having the potential of crystal separations up to the meter scale.…”

Section: Discussionmentioning

confidence: 99%

“…Hence, the analyser is displaced by ρ∆y and the hρ∆y term appears in the ψ o1 (p, q) phase. By using the ψ in (q) factor of ( 8), where q 0 /K = 0, and transforming (17) back to the direct space, we obtain (see the supplementary material)…”

Section: Moiré Fringesmentioning

confidence: 99%

“…We can qualitatively understand the effect of the source coherence as follows. According to (17) and the therein discussion, the phase difference of fringe patterns originated by any pair of point-like sources vertically spaced by ∆y is hρ∆y. If z D = z A (that is, the detection plane is the analyser), the patterns' spacing is ∆y and their phases run as hρy.…”

Section: Fringe Contrastmentioning

confidence: 99%

“…Recently, Lemmel and collaborators [16,17] operated a neutron interferometer having a split analyser crystal and achieved a proof-of-principle demonstration that split-crystal interferometry with neutrons is possible. This demonstration opens the way to the realisation of skew-symmetric interferometers operating with neutrons and having crystal separations up to the meter scale.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Three-dimensional model of a split-crystal x-ray and neutron interferometer

Sasso¹,

Mana²,

Massa³

2022

Preprint

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The observation of neutron interference by using a crystal interferometer having a separate analyser opens the way to the construction and operation of interferometers with vast arm separation and length. Setting the design specifications requires a three-dimensional dynamical-theory model of their operation. In this paper, we develop the needed three-dimensional mathematical framework, which also comprises coherent and incoherent illuminations, and apply it to study the visibility of the interference fringes.

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Section: Fringe Contrastmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Moiré Fringesmentioning

confidence: 99%

Section: Fringe Contrastmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Three-dimensional model of a split-crystal x-ray and neutron interferometer

Sasso¹,

Mana²,

Massa³

2022

Preprint

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Phase vortex lattices in neutron interferometry

et al. 2023

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Neutron Orbital Angular Momentum (OAM) is an additional quantum mechanical degree of freedom, useful in quantum information, and may provide more complete information on the neutron scattering amplitude of nuclei. Various methods for producing OAM in neutrons have been discussed. In this work we generalize magnetic methods which employ coherent averaging and apply this to neutron interferometry. Two aluminium prisms are inserted into a nested loop interferometer to generate a phase vortex lattice with significant extrinsic OAM, 〈Lz〉 ≈ 0.35, on a length scale of ≈ 220 μm, transverse to the propagation direction. Our generalized method exploits the strong nuclear interaction, enabling a tighter lattice. Combined with recent advances in neutron compound optics and split crystal interferometry our method may be applied to generate intrinsic neutron OAM states. Finally, we assert that, in its current state, our setup is directly applicable to anisotropic ultra small angle neutron scattering.

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Search for Dark Energy with Neutron Interferometry

Fischer,

Käding,

Lemmel

et al. 2024

Progress of Theoretical and Experimental Physics

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We use previously obtained experimental results by neutron interferometry to effectively constrain the parameter space of several prominent dark energy models. This investigation encompasses the environment-dependent dilaton field, a compelling contender for dark energy that emerges naturally within the strong coupling limit of string theory, alongside symmetron and chameleon fields. Our study presents substantial improvements over previous constraints of the dilaton and symmetron fields, improving parameter constraints by several orders of magnitude. However, the analysis does not yield any new constraints on the chameleon field. Furthermore, we establish constraints for the projected neutron split interferometer, which has recently concluded a decisive proof-of-principle demonstration. Our symmetron simulations reveal that depending on the parameter values there are multiple static solutions with increasing number of nodes and increasing energy inside a cylindrical vacuum chamber. This agrees with results obtained earlier in the literature for infinitely parallel plates. Interestingly, while these multiple solutions can correspond to domain walls forming inside the vacuum chamber, we also find solutions that do not reach their vacuum expectation value inside the vacuum chamber, but display multiple nodes nonetheless.

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Neutron interference from a split-crystal interferometer

Cited by 9 publications

References 30 publications

Three-dimensional model of a split-crystal x-ray and neutron interferometer

Three-dimensional model of a split-crystal x-ray and neutron interferometer

Phase vortex lattices in neutron interferometry

Search for Dark Energy with Neutron Interferometry

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