Possible Existence of a Neutron
@article{Chadwick1932PossibleEO, title={Possible Existence of a Neutron}, author={James Sir Chadwick}, journal={Nature}, year={1932}, volume={129}, pages={312-312} }
IT has been shown by Bothe and others that beryllium when bombarded by α-particles of polonium emits a radiation of great penetrating power, which has an absorption coefficient in lead of about 0.3 (cm.)−1. Recently Mme. Curie-Joliot and M. Joliot found, when measuring the ionisation produced by this beryllium radiation in a vessel with a thin window, that the ionisation increased when matter containing hydrogen was placed in front of the window. The effect appeared to be due to the ejection of…
688 Citations
Possible Existence of a Neutron
- PhysicsNature
- 1932
IN a paper to appear shortly in the Proceedings of the Royal Society, I have reported observations on the absorption of the radiations produced in beryllium and other light elements by bombardment…
Passage of Neutrons through Matter
- PhysicsNature
- 1932
THE discovery by Dr. J. Chadwick1 of strong experimental evidence in favour of the existence of neutrons of mass approximately that of the proton makes it imperative that as many lines of attack as…
The Positive Electron (Positron)
- Physics
- 2013
The year 1932 is usually considered the annus mirabilis of nuclear physics. In that year, in Cambridge, the neutron was discovered by J. Chadwick [1] by bombarding beryllium and boron with the alpha…
A history of nuclear transmutations by natural alpha particles
- Physics
- 2005
A systematic account of the use of alpha particles up to the 1930s for promoting the disintegration of atoms is here provided. As will be shown, a number of different radium family alpha sources were…
Concentration of Slow Neutrons in the Atmosphere
- PhysicsNature
- 1932
RECENT evidence1, 2 of neutral particles of atomic mass and great penetrating power suggests the possibility that terrestial matter may contain similar particles of low (thermal) energies, undetected…
Particle Physics: Neutrons radiating decay
- PhysicsNature
- 2006
That neutrons can be transmuted to protons, electrons and antineutrinos through the process of beta decay is old hat. That photons sometimes also get in on the act was suspected, but until now never…
Neutron Structure : A New Model
- Physics
- 2019
In this paper we examine two situations apparently conflicting. On a side the Quantum Mechanics (QM) denies the presence of electrons within the atomic nucleus, so that it was shelved the doublet…
Neutron Interferometry Tests of Quantum Theory a
- Physics
- 1995
The neutron, a seemingly simple, yet exquisitely complex particle, was discovered over 60 years ago by Chadwick.’ Elasser first suggested that the motion of neutrons would be determined by quantum…
Background due to secondary electron emission in the KATRIN experiment
- Physics
- 2014
KATRIN will determine the effective mass of the electron anti-neutrino with a sensitivity of 200 meV (90% C.L.) by scanning the tritium-beta-spectrum close to the endpoint energy with unprecedented…