Ultracold-neutron infrastructure for the gravitational spectrometer GRANIT

Schmidt-Wellenburg, P.; Andersen, K.H.; Courtois, P.; Kreuz, Michael; Mironov, S.; Nesvizhevsky, V. V.; Pignol, G.; Протасов, К. В.; Söldner, T.; Vezzu, F.; Zimmer, O.

doi:10.1016/j.nima.2009.07.096

Cited by 32 publications

(31 citation statements)

References 28 publications

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“…Ultracold neutrons are produced from a dedicated superthermal source installed at a cold beamline of the high flux reactor of the Institut Laue-Langevin. The source relies on downscattering of neutrons with a wavelength of 0.89 nm in a superfluid helium bath cooled down to 0.8 K [11,12]. According to a preliminary measurement of the UCN velocity spectrum [13], we expect the V velocity along the beam to be distributed with a mean value of V 0 = 4 m/s and a standard deviation of 1.5 m/s.…”

Section: The Granit Flow Through Setupmentioning

confidence: 99%

Gravitational Resonance Spectroscopy with an Oscillating Magnetic Field Gradient in the GRANIT Flow through Arrangement

Pignol

Baeßler

Nesvizhevsky

et al. 2014

Advances in High Energy Physics

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Gravitational resonance spectroscopy consists in measuring the energy spectrum of bouncing ultracold neutrons above a mirror by inducing resonant transitions between different discrete quantum levels. We discuss how to induce the resonances with a flow through arrangement in the GRANIT spectrometer, excited by an oscillating magnetic field gradient. The spectroscopy could be realized in two distinct modes (so called DC and AC) using the same device to produce the magnetic excitation. We present calculations demonstrating the feasibility of the newly proposed AC mode.

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Section: The Granit Flow Through Setupmentioning

confidence: 99%

Gravitational Resonance Spectroscopy with an Oscillating Magnetic Field Gradient in the GRANIT Flow through Arrangement

Pignol

Baeßler

Nesvizhevsky

et al. 2014

Advances in High Energy Physics

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“…We will use the new ultracold neutron source [23] which is dedicated to the GRANIT experiment to make use of the higher statistics. We will have to polarize the ultracold neutrons (UCN) and maintain the polarization with a magnetic holding field.…”

Section: The Experimental Setupmentioning

confidence: 99%

Constraints on spin-dependent short-range interactions using gravitational quantum levels of ultracold neutrons

Baeßler

Nesvizhevsky

Pignol

et al. 2009

Nuclear Instruments and Methods in Physics Research Section A:

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In this paper, we discuss a possibility to improve constraints on spin-dependent short-range interactions in the range of 1 -200 µm significantly. For such interactions, our constraints are without competition at the moment. They were obtained through the observation of gravitationally bound states of ultracold neutrons. We are going to improve these constraints by about three orders of magnitude in a dedicated experiment with polarized neutrons using the next-generation spectrometer GRANIT.

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“…Experiments exploiting other ideas for measuring the energy scale, i.e. the energy differences between quantum states, are proposed by observing resonance transitions induced by a magnetic field [17][18][19][20] and mechanical vibrations [21]. These projects are called GRANIT and qBounce, respectively.…”

Section: Introductionmentioning

confidence: 99%

Precision Measurement of the Position-Space Wave Functions of Gravitationally Bound Ultracold Neutrons

Kamiya

Ichikawa

Komamiya

2014

Advances in High Energy Physics

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Gravity is the most familiar force at our natural length scale. However, it is still exotic from the view point of particle physics. The first experimental study of quantum effects under gravity was performed using a cold neutron beam in 1975. Following this, an investigation of gravitationally bound quantum states using ultracold neutrons was started in 2002. This quantum bound system is now well understood, and one can use it as a tunable tool to probe gravity. In this paper, we review a recent measurement of positionspace wave functions of such gravitationally bound states, and discuss issues related to this analysis, such as neutron loss models in a thin neutron guide, the formulation of phase space quantum mechanics, and UCN position sensitive detectors. The quantum modulation of neutron bound states measured in this experiment shows good agreement with the prediction from quantum mechanics. *

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Ultracold-neutron infrastructure for the gravitational spectrometer GRANIT

Abstract: International audienc

Cited by 32 publications

References 28 publications

Gravitational Resonance Spectroscopy with an Oscillating Magnetic Field Gradient in the GRANIT Flow through Arrangement

Gravitational Resonance Spectroscopy with an Oscillating Magnetic Field Gradient in the GRANIT Flow through Arrangement

Constraints on spin-dependent short-range interactions using gravitational quantum levels of ultracold neutrons

Precision Measurement of the Position-Space Wave Functions of Gravitationally Bound Ultracold Neutrons

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