Gravitational Acceleration of Free Neutrons

Dabbs, J.W.T.; Harvey, J. A.; Paya, D.; Horstmann, H.

doi:10.1103/physrev.139.b756

Cited by 60 publications

(26 citation statements)

References 8 publications

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“…This has been experimentally detected in 1965 by Dabbs [1] and repeated with increased accuracy by Koester [2] and Schiedmayer [3]. The results show a correspondence up to a measurement accuracy of 0.02%.…”

Section: Introductionsupporting

confidence: 56%

Measurement of gravitation-induced quantum interference for neutrons in a spin-echo spectrometer

Haan¹,

Plomp

Well

et al. 2014

Phys. Rev. A

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With a neutron spin-echo reflectometer (OffSpec at ISIS, UK) it is possible to measure the gravitation-induced quantum phase difference between the two spin states of the neutron wave function in a magnetic field. In the small-angle approximation, this phase depends linearly on the inclination angle of the neutron beam with respect to the horizontal. This also holds for the Bonse-Hart interferometer used in the Colella-Overhauser-Werner experiments and should be taken into account. Neglecting this term could yield deviations up to 1% per degree inclination angle. The gravitation-induced quantum phase as measured with OffSpec with an accuracy of 0.1% agrees with the theoretically expected results.

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Section: Introductionsupporting

confidence: 56%

Measurement of gravitation-induced quantum interference for neutrons in a spin-echo spectrometer

Haan¹,

Plomp

Well

et al. 2014

Phys. Rev. A

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“…This result was to be expected since there is no reason for a difference in the magnitude of the gravity constants for free and bound hadrons, which could not be excluded by previous experiments [17] giving a difference (g,r -g)/g = -(0.4_+ 0.3) %.…”

Section: Discussionmentioning

confidence: 59%

New determination of the neutron-proton scattering amplitude and precise measurements of the scattering amplitudes on carbon, chlorine, fluorine and bromine

Koester

Nistler

1975

Z Physik A

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Abstract. After an improvement on the theory of the neutron-gravity-refractometer and after refinements of the experimental procedure we have performed new measurements of the absolute value of the neutron-proton scattering amplitude at low neutron energies. In order to obtain and to confirm a very high accuracy we carried out neutron-reflection experiments on 18 various liquids of 11 different organic substances containing the elements carbon, hydrogen and/or chlorine. Compounds with fluorine and bromine were used to measure the scattering amplitudes of these elements. We found the coherent scattering amplitudes of the bound atoms to be: a, = -3.7409 (11)fm, ac=6.6484(13)fm, acl=9.5792(8)fm, av= 5.66(2)fm and a~r=6.79(2)fm. The low energy (n, p)-parameters a t and a~ were calculated with the present a H and a new value of the (n, p) scattering cross-section cr 0. By comparing the measured a c with values obtained from precise transmission experiments we could determine the gravitational acceleration gj of the free neutron in terms of the local value g. We found the two values to be equal: gf =0.9996(7)g.

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“…while the only surviving Weyl scalar is ψ 2 = −mA 3 (x +ỹ) 3 ; here a prime and a dot denote differentiation with respect tox andỹ, respectively. Following the approach of Prestidge [41], rescaling the unknown ψ s of the master equation (for the various ψ s satisfying the master equation, see e.g.…”

Section: Massless Perturbations Of Accelerating Schwarzschild Spacetimementioning

confidence: 99%

“…Soon upper limits were placed on the strength of such an interaction from the measurements of the hyperfine splitting of the ground state of hydrogen [2] and the gravitational acceleration of free neutrons [3]. More generally, an interaction Hamiltonian of the form…”

Section: Introductionmentioning

confidence: 99%

Spin, acceleration and gravity

Bini¹,

Cherubini²,

Mashhoon³

2004

Class. Quantum Grav.

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The massless field perturbations of the accelerating Minkowski and Schwarzschild spacetimes are studied. The results are extended to the propagation of the Proca field in Rindler spacetime. We examine critically the possibility of existence of a general spin-acceleration coupling in complete analogy with the well-known spin-rotation coupling. We argue that such a direct coupling between spin and linear acceleration does not exist.

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Gravitational Acceleration of Free Neutrons

Cited by 60 publications

References 8 publications

Measurement of gravitation-induced quantum interference for neutrons in a spin-echo spectrometer

Measurement of gravitation-induced quantum interference for neutrons in a spin-echo spectrometer

New determination of the neutron-proton scattering amplitude and precise measurements of the scattering amplitudes on carbon, chlorine, fluorine and bromine

Spin, acceleration and gravity

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