scholarly journals Probing the neutron’s electric neutrality with Ramsey spectroscopy of gravitational quantum states of ultracold neutrons

2011 ◽  
Vol 84 (3) ◽  
Author(s):  
Katharina Durstberger-Rennhofer ◽  
Tobias Jenke ◽  
Hartmut Abele
Keyword(s):  
Quantum States ◽  
Ultracold Neutrons ◽  
Electric Neutrality

QUANTUM STATES OF NEUTRONS IN THE EARTH'S GRAVITATIONAL FIELD: CONSTRAINTS FOR QUASI-ELASTIC REFLECTIONS IN THE RANGE ΔE~10-12–10-9eV

2005 ◽  
Vol 14 (03n04) ◽  
pp. 511-519 ◽  
Author(s):  
V. V. NESVIZHEVSKY
Keyword(s):  
Quantum Mechanics ◽  
Gravitational Field ◽  
Energy Range ◽  
Quantum States ◽  
Ultracold Neutrons ◽  
Neutron Spectrometry ◽  
Earth’S Gravitational Field ◽  
Elastic Process

A restrictive constraint for any quasi-elastic process was obtained in the previously inaccessible energy range ΔE~10-12–3·10-10 eV for reflections of ultracold neutrons from surfaces in the experiment on neutron quantum states in the earth's gravitational field. This could be useful for precision neutron spectrometry experiments and for the verification of extensions of quantum mechanics.

scholarly journals Quantized Ultracold Neutrons in Rough Waveguides: GRANIT Experiments and Beyond

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
M. Escobar ◽  
A. E. Meyerovich
Keyword(s):  
Surface Roughness ◽  
Quantum States ◽  
Scaling Relations ◽  
Ultracold Neutrons ◽  
System Parameters ◽  
Neutron Count ◽  
Simple Scaling ◽  
Biased Diffusion ◽  
Rough Boundaries ◽  
Single Constant

We apply our general theory of transport in systems with random rough boundaries to gravitationally quantized ultracold neutrons in rough waveguides as in GRANIT experiments (ILL, Grenoble). We consider waveguides with roughness in both two and one dimensions (2D and 1D). In the biased diffusion approximation the depletion times for the gravitational quantum states can be easily expressed via each other irrespective of the system parameters. The calculation of the exit neutron count reduces to evaluation of a single constant which contains a complicated integral of the correlation function of surface roughness. In the case of 1D roughness (random grating) this constant is calculated analytically for common types of the correlation functions. The results obey simple scaling relations which are slightly different in 1D and 2D. We predict the exit neutron count for the new GRANIT cell.

scholarly journals Status of the GRANIT Facility

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Damien Roulier ◽  
Francis Vezzu ◽  
Stefan Baeßler ◽  
Benoît Clément ◽  
Daniel Morton ◽  
...  
Keyword(s):  
Particle Physics ◽  
Quantum States ◽  
Experimental Techniques ◽  
Current Status ◽  
Ultracold Neutrons

The GRANIT facility is a follow-up project, which is motivated by the recent discovery of gravitational quantum states of ultracold neutrons. The goal of the project is to approach the ultimate accuracy in measuring parameters of such quantum states and also to apply this phenomenon and related experimental techniques to a broad range of applications in particle physics as well as in surface and nanoscience studies. We overview the current status of this facility, the recent test measurements, and the nearest prospects.

scholarly journals Prospects for Studies of the Free Fall and Gravitational Quantum States of Antimatter

2015 ◽  
Vol 2015 ◽  
pp. 1-16 ◽  
Author(s):  
G. Dufour ◽  
D. B. Cassidy ◽  
P. Crivelli ◽  
P. Debu ◽  
A. Lambrecht ◽  
...  
Keyword(s):  
Free Fall ◽  
Quantum States ◽  
Experimental Techniques ◽  
Ultracold Neutrons ◽  
Neutral System ◽  
Close Analogy ◽  
Quantum Reflection ◽  
The Status ◽  
Neutral Antimatter ◽  
Ultimate Limit

Different experiments are ongoing to measure the effect of gravity on cold neutral antimatter atoms such as positronium, muonium, and antihydrogen. Among those, the project GBAR at CERN aims to measure precisely the gravitational fall of ultracold antihydrogen atoms. In the ultracold regime, the interaction of antihydrogen atoms with a surface is governed by the phenomenon of quantum reflection which results in bouncing of antihydrogen atoms on matter surfaces. This allows the application of a filtering scheme to increase the precision of the free fall measurement. In the ultimate limit of smallest vertical velocities, antihydrogen atoms are settled in gravitational quantum states in close analogy to ultracold neutrons (UCNs). Positronium is another neutral system involving antimatter for which free fall under gravity is currently being investigated at UCL. Building on the experimental techniques under development for the free fall measurement, gravitational quantum states could also be observed in positronium. In this contribution, we report on the status of the ongoing experiments and discuss the prospects of observing gravitational quantum states of antimatter and their implications.

Geometry of Quantum States

2006 ◽  
Author(s):  
Ingemar Bengtsson ◽  
Karol Zyczkowski
Keyword(s):  
Quantum States
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