A note on the Wilson cloud chamber (1912)

Leone, Matteo; Robotti, Nadia

doi:10.1088/0143-0807/25/6/010

Cited by 13 publications

(8 citation statements)

References 7 publications

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“…As is well known, the first condition was met in 1911 by the development of the cloud chamber technique by Wilson, 34 and the second one was partially fulfilled in 1923, when the cloud chamber was first coupled with strong magnetic fields by Kapitsa (to observe the bending of alpha particle tracks) and Skobeltsyn (in order to test the Compton effect). 35 Under these experimental conditions, to determine the sign of the charge of a particle, it is necessary to know which direction it is moving.…”

Section: Discussionmentioning

confidence: 99%

An uninvited guest: The positron in early 1930s physics

Leone¹,

Robotti

2012

American Journal of Physics

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A few months before its "official" discovery in September 1932 by Anderson at Cal Tech in Pasadena, the positron was almost simultaneously observed by no less than two additional research teams: one at Cavendish Laboratory in Cambridge, England, and one at Institut du Radium in Paris, France. In this paper, we examine this curious case of multiple independent observations by studying the primary literature. This study identifies the motivations that led these researchers to independently design the experiments suitable for the detection of this novel particle and shows that none of these teams were looking for a positive electron.

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Section: Discussionmentioning

confidence: 99%

An uninvited guest: The positron in early 1930s physics

Leone¹,

Robotti

2012

American Journal of Physics

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“…An example of a strongly coupled apparatus is Wilson's chamber [69,70] containing a radioactive atom emitting, for example, an α particle. The chamber is filled up with the mixture of air and water molecules, and its volume is suddenly extended to bring the mixture into supersaturation.…”

Section: Particle Cloud Chambermentioning

confidence: 99%

Macroscopic Limit of Quantum Systems

Polónyi

2021

Universe

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Classical physics is approached from quantum mechanics in the macroscopic limit. The technical device to achieve this goal is the quantum version of the central limit theorem, derived for an observable at a given time and for the time-dependent expectation value of the coordinate. The emergence of the classical trajectory can be followed for the average of an observable over a large set of independent microscopical systems, and the deterministic classical laws can be recovered in all practical purposes, owing to the largeness of Avogadro’s number. This result refers to the observed system without considering the measuring apparatus. The emergence of a classical trajectory is followed qualitatively in Wilson’s cloud chamber.

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“…An example of a strongly coupled apparatus is Wilson's chamber [51,52] containing a radioactive atom emitting say an α particle. The chamber is filled up with the mixture of air and water molecules and its volume is suddenly extended to bring the mixture into supersaturation.…”

Section: B Particle Cloud Chambermentioning

confidence: 99%

Macroscopic limit of quantum systems

Polónyi¹

2021

Preprint

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The classical physics is approached from quantum mechanics in the macroscopic limit. The technical device to achieve this goal is the quantum version of the central limit theorem, derived for an observable at a given time and for the time-dependent expectation value of the coordinate. The emergence of the classical trajectory can be followed and the deterministic classical laws can be recovered in all practical purposes owing to the largeness of Avogadro's number. The emergence of a classical trajectory is followed qualitatively in Wilson's cloud chamber.

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A note on the Wilson cloud chamber (1912)

Cited by 13 publications

References 7 publications

An uninvited guest: The positron in early 1930s physics

An uninvited guest: The positron in early 1930s physics

Macroscopic Limit of Quantum Systems

Macroscopic limit of quantum systems

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