On the Masses of28Si and the Proton Determined in a Penning Trap

2002 ◽  
Vol 66 (3) ◽  
pp. 201-207 ◽  
Author(s):  
I Bergström ◽  
T Fritioff ◽  
R Schuch ◽  
J Schönfelder
Keyword(s):  
Penning Trap ◽  
The Masses

scholarly journals Precision Physics in Penning Traps Using the Continuous Stern-Gerlach Effect

2021 ◽  
pp. 247-261
Author(s):  
Klaus Blaum ◽  
Günter Werth
Keyword(s):  
Penning Trap ◽  
Magnetic Moments ◽  
Ion Traps ◽  
Detection Methods ◽  
Penning Traps ◽  
Atomic Particle ◽  
Ideal Object ◽  
Electric And Magnetic Fields ◽  
Unlimited Time ◽  
The Masses

Abstract“A single atomic particle forever floating at rest in free space” (H. Dehmelt) would be the ideal object for precision measurements of atomic properties and for tests of fundamental theories. Such an ideal, of course, can ultimately never be achieved. A very close approximation to this ideal is made possible by ion traps, where electromagnetic forces are used to confine charged particles under well-controlled conditions for practically unlimited time. Concurrently, sensitive detection methods have been developed to allow observation of single stored ions. Various cooling methods can be employed to bring the trapped ion nearly to rest. Among different realisations of ion traps we consider in this chapter the so-called Penning traps which use static electric and magnetic fields for ion confinement. After a brief discussion of Penning-trap properties, we consider various experiments including the application of the “continuous Stern-Gerlach effect”, which have led recently to precise determinations of the masses and magnetic moments of particles and antiparticles. These serve as input for testing fundamental theories and symmetries.

Penning Trap Measurements of the Masses ofC133s,R87,85b, andN23awith Uncertainties≤0.2ppb

1999 ◽  
Vol 83 (22) ◽  
pp. 4510-4513 ◽  
Author(s):  
Michael P. Bradley ◽  
James V. Porto ◽  
Simon Rainville ◽  
James K. Thompson ◽  
David E. Pritchard
Keyword(s):  
Penning Trap ◽  
The Masses

In situ irradiation effects studies in medium- and high-voltage TEM

1995 ◽  
Vol 53 ◽  
pp. 234-235
Author(s):  
Charles W. Allen
Keyword(s):  
Cross Section ◽  
Particle Flux ◽  
Threshold Value ◽  
High Energy ◽  
Irradiation Damage ◽  
Defect Complexes ◽  
Lattice Position ◽  
Electrons And Ions ◽  
The Masses

With respect to structural consequences within a material, energetic electrons, above a threshold value of energy characteristic of a particular material, produce vacancy-interstial pairs (Frenkel pairs) by displacement of individual atoms, as illustrated for several materials in Table 1. Ion projectiles produce cascades of Frenkel pairs. Such displacement cascades result from high energy primary knock-on atoms which produce many secondary defects. These defects rearrange to form a variety of defect complexes on the time scale of tens of picoseconds following the primary displacement. A convenient measure of the extent of irradiation damage, both for electrons and ions, is the number of displacements per atom (dpa). 1 dpa means, on average, each atom in the irradiated region of material has been displaced once from its original lattice position. Displacement rate (dpa/s) is proportional to particle flux (cm-2s-1), the proportionality factor being the “displacement cross-section” σD (cm2). The cross-section σD depends mainly on the masses of target and projectile and on the kinetic energy of the projectile particle.

Methods for the Masses: Demystifying Multilevel (or Hierarchical Linear) Modeling

2012 ◽  
Author(s):  
Lisa Kath ◽  
Christopher J. L. Cunningham ◽  
Alan D. Mead
Keyword(s):  
Hierarchical Linear Modeling ◽  
Linear Modeling ◽  
The Masses

Mass Media Misleading the Masses: The Propagation of Nonscientifically Supported Autism Treatments

2012 ◽  
Author(s):  
Kimberly A. Schreck ◽  
Melissa Russell ◽  
Luis Vargas ◽  
Tanya Brucie ◽  
Jennifer Hall
Keyword(s):  
Mass Media ◽  
The Masses ◽  
Autism Treatments

Leucocytes and Thrombosis

1973 ◽  
Vol 30 (01) ◽  
pp. 036-046 ◽  
Author(s):  
D.C Banks ◽  
J.R.A Mitchell
Keyword(s):  
Cell Count ◽  
White Cell Count ◽  
Cell Loss ◽  
White Cell ◽  
Structural Resemblance ◽  
The Masses

SummaryWhen heparinised blood is rotated in a glass flask at 37°C. the white cell count falls and it has been shown that this is due to the adherence and aggregation of polymorphonuclear white cells on the wall of the flask. The masses formed bear a close structural resemblance to thrombi and the mechanisms involved in white cell loss during rotation may therefore increase our knowledge of the thrombotic process.

Interdisciplinary Design Experience for the Masses

AEI 2011 ◽  
2011 ◽  
Author(s):  
Brent Nuttall ◽  
Jill Nelson ◽  
Allen C. Estes
Keyword(s):  
Interdisciplinary Design ◽  
The Masses ◽  
Design Experience
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