Whispering gallery states of neutrons and anti-hydrogen atoms and their applications to fundamental and surface physics

Valery Nesvizhevsky

doi:10.1117/12.2011271

28 March 2013 Whispering gallery states of neutrons and anti-hydrogen atoms and their applications to fundamental and surface physics

Valery Nesvizhevsky

Author Affiliations +

Proceedings Volume 8600, Laser Resonators, Microresonators, and Beam Control XV; 86001C (2013) https://doi.org/10.1117/12.2011271
Event: SPIE LASE, 2013, San Francisco, California, United States

Abstract

The ‘whispering gallery’ effect has been known since ancient times for sound waves in air, later in water and more recently for a broad range of electromagnetic waves: radio, optics, Roentgen and so on. It is intensively used and explored due to its numerous crucial applications. It consists of wave localization near a curved reflecting surface and is expected for waves of various natures, for instance, for neutrons and (anti)atoms. For (anti)matter waves, it includes a new feature: a massive particle is settled in quantum states, with parameters depending on its mass. In this talk, we present the first observation of the quantum whispering-gallery effect for matter particles (cold neutrons) ^1-2. This phenomenon provides an example of an exactly solvable problem analogous to the ‘quantum bouncer’; it is complementary to recently discovered gravitational quantum states of neutrons³. These two phenomena provide a direct demonstration of the weak equivalence principle for a massive particle in a quantum state. Deeply bound long-living states are weakly sensitive to surface potential; highly excited short-living states are very sensitive to the wall nuclear potential shape. Therefore, they are a promising tool for studying fundamental neutron–matter interactions, quantum neutron optics and surface physics effects. Analogous phenomena could be measured with atoms and anti-atoms ^4-5.

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Valery Nesvizhevsky "Whispering gallery states of neutrons and anti-hydrogen atoms and their applications to fundamental and surface physics", Proc. SPIE 8600, Laser Resonators, Microresonators, and Beam Control XV, 86001C (28 March 2013); https://doi.org/10.1117/12.2011271

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Chemical species

Mirrors

Particles

Physics

Reflection

Electromagnetic radiation

Quantum physics

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