Neutron storage between perfect silicon crystal plates

Schuster, M.; Carlile, C.J.; Rauch, H.

doi:10.1007/bf01387787

Cited by 16 publications

(13 citation statements)

References 18 publications

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“…In this article, we reconsider a proposal of an experimental test of the QZE that makes use of neutron spin [9]. In view of the recent progress in perfect crystal neutron-storage technology [10,11], it is necessary to investigate the physical properties of a Zeno setup, focusing in particular on practical limits.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a neutron-spin test of the quantum Zeno effect

et al. 2003

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A neutron-spin experimental test of the quantum Zeno effect (QZE) is discussed from a practical point of view, when the nonideal efficiency of the magnetic mirrors, used for filtering the spin state, is taken into account. In the idealized case the number N of (ideal) mirrors can be indefinitely increased, yielding an increasingly better QZE. By contrast, in a practical situation with imperfect mirrors, there is an optimal number of mirrors, Nopt, at which the QZE becomes maximum: more frequent measurements would deteriorate the performance. However, a quantitative analysis shows that a good experimental test of the QZE is still feasible. These conclusions are of general validity: in a realistic experiment, the presence of losses and imperfections leads to an optimal frequency Nopt, which is in general finite. One should not increase N beyond Nopt. A convenient formula for Nopt, valid in a broad framework, is derived as a function of the parameters characterizing the experimental setup.

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Section: Introductionmentioning

confidence: 99%

Optimization of a neutron-spin test of the quantum Zeno effect

et al. 2003

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“…Both are based on a shift of the narrow incident energy distribution away from the region of total reflection. To shift the energy distribution across the scattering range of the vibrating crystal one could use a CaF2 thermalgradient monochromator, or as in the experiments of Schuster et al (1991) and Jericha et al (1996) apply a magnetic field. With both methods, the Doppler-strain field could be probed step by step with a resolution determined by the energy width of the incident beam.…”

Section: Time Structure Of the Transmitted Beam In Response To Neutromentioning

confidence: 99%

“…Multiple scattering of neutrons in backscattering geometry can be used for the storage of cold neutrons. Recently, a storage device based on multiple reflections of neutrons between two perfect (111)-oriented crystal plates cut from a monolithic silicon crystal was proposed (Schuster et al, 1990) and built (Schuster et al, 1991;Jericha et al, 1996). Multiple reflections on hkl/-h-k-l reflection pairs inside a longitudinally vibrating silicon crystal set up in a fully asymmetric diffraction geometry can be used to generate neutron pulses as short as 1.3 ~s (Mikula et al, 1980;Kulda et al, 1981).…”

Section: Introductionmentioning

confidence: 99%

Neutron Storage in a Longitudinally Vibrating Silicon Crystal

Hock

Liss²,

Magerl³

et al. 1998

J Appl Cryst

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The time structure and integrated diffraction profile of cold neutrons of wavelength λ = 6.27 Å transmitted through a longitudinally vibrating silicon crystal were calculated by Monte Carlo simulations and measured on the backscattering spectrometer IN10 at the Institut Laue–Langevin. Neutrons of velocity vN = 630 ms−1 require tT = 158.5 μs for direct transit through the 100 mm‐long silicon resonator. This time is long compared with the vibration period TP = 22.3 μs and most of the neutrons experience multiple Bragg reflections in the oscillating Doppler‐strain field. Monte Carlo calculations predict that neutrons will be stored in the crystal and released with a time structure determined by the vibration period and by the energy width of the incident beam. For a continuous beam, the usual time modulation of the diffracted neutrons with twice the vibration frequency is expected. If a neutron pulse much shorter than the vibration period impinges on the crystal, the transmitted signal should be a decaying sequence of pulses separated by the vibration period. For pulses which are long compared with the vibration period, the effect of neutron storage should be manifest as a delayed staircase‐like intensity variation on both pulse edges. A silicon crystal was set with the (111) lattice planes in backreflection and excited in a λ/2 resonance at 44.78 kHz. A typical deformation amplitude was u0 = 1 μm corresponding to a scattering range of ΔE = ±1.9 μeV. The response of the λ/2 resonator to a quasicontinuous beam and to neutron pulses of lengths ΔtP = 3 ms and 33 μs FWHM was measured. Experiments were performed with neutron beams of two energy widths ΔE = ±0.35 and ±1.23 μeV. In agreement with the Monte Carlo simulations, neutron storage in the silicon crystal was observed. The storage time was 250 μs for both long and short incident pulses. This time equals about 11 vibration periods of the crystal resonator and is in good agreement with the calculations for the Si 111 reflection and chosen vibration parameters. A first indication of the dependence of the time structure on the energy width of the neutron beam was seen in the experiments. The predicted pulsed structure of the transmitted signal in response to neutron pulses shorter than the vibration period could not be resolved. With a shortest incident pulse width of ΔtP = 33 μs, the condition ΔtP << TP, was not fulfilled. The measured transmission profile is in good agreement with the calculations for the λ/2 resonator. Compared with vibrating crystals excited into higher harmonics at the same applied strain, the λ/2 resonator has a lower reflectivity.

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Ultracold neutrons discovery and research

Ignatovich

1996

Usp. Fiz. Nauk

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Neutron storage between perfect silicon crystal plates

Cited by 16 publications

References 18 publications

Optimization of a neutron-spin test of the quantum Zeno effect

Optimization of a neutron-spin test of the quantum Zeno effect

Neutron Storage in a Longitudinally Vibrating Silicon Crystal

Ultracold neutrons discovery and research

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Neutron storage between perfect silicon crystal plates

Cited by 16 publications

References 18 publications

Optimization of a neutron-spin test of the quantum Zeno effect

Optimization of a neutron-spin test of the quantum Zeno effect

Neutron Storage in a Longitudinally Vibrating Silicon Crystal

Ultracold neutrons  discovery and research

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Ultracold neutrons discovery and research