Detecting neutral particles

2020 ◽  
pp. 191-205
Author(s):  
R.S. Gilmore
Keyword(s):  
Neutral Particles

First H+ Charge-Exchange Images in the Stim.

1976 ◽  
Vol 34 ◽  
pp. 504-505
Author(s):  
Wm. H. Escovitz ◽  
T. R. Fox ◽  
R. Levi-Setti
Keyword(s):  
Charge Exchange ◽  
Neutral Component ◽  
Channel Electron Multiplier ◽  
Electron Multiplier ◽  
Neutral Particles ◽  
Charged Beam ◽  
Scanning Transmission ◽  
Contrast Mechanism ◽  
Ion Microscopy ◽  
Beam Component

Charge exchange, the neutralization of ions by electron capture as the ions traverse matter, is a well-known phenomenon of atomic physics which is relevant to ion microscopy. In conventional transmission ion microscopes, the neutral component of the beam after it emerges from the specimen cannot be focused. The scanning transmission ion microscope (STIM) enables the detection of this signal to make images. Experiments with a low-resolution 55 kV STIM indicate that the charge-exchange signal provides a new contrast mechanism to detect extremely small amounts of matter. In an early version of charge-exchange detection (fig. 1), a permanent magnet installed between the specimen and the detector (a channel electron multiplier) sweeps the charged beam component away from the detector and allows only the neutrals to reach it. When the magnet is removed, both charged and neutral particles reach the detector.

Channeling of neutral particles and photons in crystals

1992 ◽  
Vol 162 (9) ◽  
pp. 1 ◽  
Author(s):  
V.I. Vysotskii ◽  
R.N. Kuz'min
Keyword(s):  
Neutral Particles

Wave velocity disturbances of neutral particles and ions in the polar regions

2013 ◽  
Vol 19 (4(83)) ◽  
pp. 50-56
Author(s):  
A.V. Bespalova ◽  
◽  
A.K. Fedorenko ◽  
Keyword(s):  
Wave Velocity ◽  
Polar Regions ◽  
Neutral Particles

The influence of blobs on neutral particles in the scrape-off layer

2016 ◽  
Vol 58 (4) ◽  
pp. 044010 ◽  
Author(s):  
Alexander S Thrysøe ◽  
Laust E H Tophøj ◽  
Volker Naulin ◽  
Jens Juul Rasmussen ◽  
Jens Madsen ◽  
...  
Keyword(s):  
Neutral Particles

Investigation of Neutral Particles Using High Speed Camera and Monte-Carlo Simulation in the GAMMA 10 Central-Cell

2007 ◽  
Vol 51 (2T) ◽  
pp. 82-85 ◽  
Author(s):  
Y. Nakashima ◽  
Y. Higashizono ◽  
N. Nishino ◽  
H. Kawano ◽  
M.K. Islam ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
High Speed ◽  
Central Cell ◽  
High Speed Camera ◽  
Neutral Particles

scholarly journals Geodesic motion of neutral particles around a Kerr–Newman black hole

2017 ◽  
Vol 34 (23) ◽  
pp. 235008 ◽  
Author(s):  
Chen-Yu Liu ◽  
Da-Shin Lee ◽  
Chi-Yong Lin
Keyword(s):  
Black Hole ◽  
Geodesic Motion ◽  
Neutral Particles ◽  
Newman Black Hole

The nature of the neutral particles emitted in Kβ3 decay

1959 ◽  
Vol 14 (3) ◽  
pp. 493-498 ◽  
Author(s):  
K. Imaeda ◽  
M. A. Shaukat
Keyword(s):  
Neutral Particles

scholarly journals WHAT IS A MATTER PARTICLE?

2006 ◽  
Vol 15 (01) ◽  
pp. 259-272
Author(s):  
TSAN UNG CHAN
Keyword(s):  
Standard Model ◽  
Weak Interaction ◽  
Strong Interaction ◽  
Neutral Particle ◽  
Z Bosons ◽  
Baryon Number ◽  
Lepton Number ◽  
Neutral Particles ◽  
The Standard Model ◽  
The Stability

Positive baryon numbers (A>0) and positive lepton numbers (L>0) characterize matter particles while negative baryon numbers and negative lepton numbers characterize antimatter particles. Matter particles and antimatter particles belong to two distinct classes of particles. Matter neutral particles are particles characterized by both zero baryon number and zero lepton number. This third class of particles includes mesons formed by a quark and an antiquark pair (a pair of matter particle and antimatter particle) and bosons which are messengers of known interactions (photons for electromagnetism, W and Z bosons for the weak interaction, gluons for the strong interaction). The antiparticle of a matter particle belongs to the class of antimatter particles, the antiparticle of an antimatter particle belongs to the class of matter particles. The antiparticle of a matter neutral particle belongs to the same class of matter neutral particles. A truly neutral particle is a particle identical with its antiparticle; it belongs necessarily to the class of matter neutral particles. All known interactions of the Standard Model conserve baryon number and lepton number; matter cannot be created or destroyed via a reaction governed by these interactions. Conservation of baryon and lepton number parallels conservation of atoms in chemistry; the number of atoms of a particular species in the reactants must equal the number of those atoms in the products. These laws of conservation valid for interaction involving matter particles are indeed valid for any particles (matter particles characterized by positive numbers, antimatter particles characterized by negative numbers, and matter neutral particles characterized by zero). Interactions within the framework of the Standard Model which conserve both matter and charge at the microscopic level cannot explain the observed asymmetry of our Universe. The strong interaction was introduced to explain the stability of nuclei: there must exist a powerful force to compensate the electromagnetic force which tends to cause protons to fly apart. The weak interaction with laws of conservation different from electromagnetism and the strong interaction was postulated to explain beta decay. Our observed material and neutral universe would signify the existence of another interaction that did conserve charge but did not conserve matter.

Sign in / Sign up

Export Citation Format

Share Document