PRECISION MEASUREMENT OF THE MOMENTA OF CONVERSION ELECTRON LINES FROM SOURCES OF 212Pb (ThB)

1965 ◽  
Vol 43 (2) ◽  
pp. 171-192 ◽  
Author(s):  
R. L. Graham ◽  
G. Murray ◽  
J. S. Geiger
Keyword(s):  
Least Squares ◽  
Precision Measurement ◽  
Conversion Electron ◽  
Internal Conversion ◽  
Calibration Method ◽  
Conversion Line ◽  
Fundamental Constants ◽  
X Ray ◽  
Self Calibration

Momentum ratios of some of the more intense internal conversion lines from sources of thorium radioactive deposit have been determined with accuracies of 1 to 4 parts in 105 using an iron-free β spectrometer. Accurate absolute values of the momenta were obtained from intercomparisons of these line momenta with that of the K-412 internal conversion line in 198Hg. The X-ray self-calibration method of Siegbahn is discussed in some detail and is shown to be less accurate at this time. The results are analyzed on both the 1955 and 1963 least-squares adjusted values of the fundamental constants.

Precision Measurement of Transition and Level Energies in 233U

1971 ◽  
Vol 26 (6) ◽  
pp. 1092-1093 ◽  
Author(s):  
T. von Egidy ◽  
O.W.B. Schult ◽  
W. Kallinger ◽  
D. Breitig ◽  
R.P. Sharma ◽  
...  
Keyword(s):  
Least Squares ◽  
Precision Measurement ◽  
Level Scheme ◽  
Gamma Ray ◽  
Crystal Spectrometer ◽  
Transition Energies ◽  
Annihilation Line ◽  
X Ray ◽  
Bent Crystal ◽  
Better Than

Abstract Gamma ray energies in 233U following the decay of 233Pa were measured with the Risö bent crystal spectrometer. These gamma lines were detected during the study of the 232Th(n,y)233Th reaction. Experimental details will be given elsewhere1. The energies were calibrated with the X-ray lines2 and the annihilation line3. The energies of seven transitions between 270 and 420 keV were determined with an accuracy which is up to a factor of 10 better than previous measurements by Albridge, Hollander, Gallagher, and Hamilton4. The transition energies are shown in the level scheme 4, 5 (Fig. 1 ) . A least squares program was used to fit the level energies to the seven transition energies obtained in this experiment and to four transition energies (below 103 keV) measured precisely by Albridge et al. 4. Level energies could be calculated with an accuracy of about 20 eV (Fig. 1).

scholarly journals The Self-Calibration Method for the Vertex Distance of the Elliptical Paraboloid Array

2019 ◽  
Vol 9 (17) ◽  
pp. 3485 ◽  
Author(s):  
Zekui Lv ◽  
Zhikun Su ◽  
Dong Zhang ◽  
Lingyu Gao ◽  
Zhiming Yang ◽  
...  
Keyword(s):  
Precision Measurement ◽  
Communication Systems ◽  
Calibration Method ◽  
Displacement Measurement ◽  
The Self ◽  
Self Calibration ◽  
Series Of Experiments ◽  
Geometrical Relationship ◽  
High Repeatability ◽  
Elliptical Paraboloid

The elliptical paraboloid array plays an important role in precision measurement, astronomical telescopes, and communication systems. The calibration of the vertex distance of elliptical paraboloids is of great significance to precise 2D displacement measurement. However, there are some difficulties in determining the vertex position with contact measurement. In this study, an elliptical paraboloid array and an optical slope sensor for displacement measurement were designed and analyzed. Meanwhile, considering the geometrical relationship and relative angle between elliptical paraboloids, a non-contact self-calibration method for the vertex distance of the elliptical paraboloid array was proposed. The proposed self-calibration method was verified by a series of experiments with a high repeatability, within 3   μ m in the X direction and within 1   μ m in the Y direction. Through calibration, the displacement measurement system error was reduced from 100   μ m to 3   μ m . The self-calibration method of the elliptical paraboloid array has great potential in the displacement measurement field, with a simple principle and high precision.

The Internal Conversion Electron Spectrum of 147Nd

1967 ◽  
Vol 22 (2) ◽  
pp. 154-164 ◽  
Author(s):  
E. Bashandy ◽  
A. Abd El-Haliem
Keyword(s):  
Line Intensity ◽  
Conversion Electron ◽  
Electron Spectrum ◽  
Internal Conversion ◽  
Conversion Line ◽  
Β Decay ◽  
Internal Conversion Electron ◽  
Conversion Electron Spectrum ◽  
Momentum Resolution ◽  
Intensity Ratios

The internal conversion electron spectrum following the β-decay of 147Nd has been studied using, an iron yoke and an iron free double focussing β-ray spectrometer at a momentum resolution of about 0.2%. A total of 66 transitions has been ascribed to this decay. On the basis of statistical analysis of sum relationships for the transition energies, combined with earlier reported coincidence results, a decay scheme involving 16 excited levels is suggested. The experimental data indicate a higher state at 763 keV. Its energy is close to the high state observed in other promethium nuclei.The multipolarity assignment for each transition was obtained by comparing the observed conversion line intensity ratios with the theoretical line intensity ratios of SLIV and BAND. From the multipolarity values obtained, the spins and parities of the excited levels in 147Pm are assigned and discussed in terms of recent nuclear models.

scholarly journals The internal conversion of gamma-rays.—Part II

1928 ◽  
Vol 121 (787) ◽  
pp. 447-456
Keyword(s):  
Magnetic Field ◽  
Quantum Mechanics ◽  
Wave Equation ◽  
Gamma Rays ◽  
Internal Conversion ◽  
Scalar Potential ◽  
X Ray ◽  
Electro Magnetic Field ◽  
Γ Rays ◽  
Electro Magnetic

In a previous paper the absorption of γ-rays in the K-X-ray levels of the atom in which they are emitted was calculated according to the Quantum Mechanics, supposing the γ-rays to be emitted from a doublet of moment f ( t ) at the centre of the atom. The non-relativity wave equation derived from the relativity wave equation for an electron of charge — ε moving in an electro-magnetic field of vector potential K and scalar potential V is h 2 ∇ 2 ϕ + 2μ ( ih ∂/∂ t + εV + ih ε/μ c (K. grad)) ϕ = 0. (1) Suppose, however, that K involves the space co-ordinates. Then, (K. grad) ϕ ≠ (grad . K) ϕ , and the expression (K . grad) ϕ is not Hermitic. Equation (1) cannot therefore be the correct non-relativity wave equation for a single electron in an electron agnetic field, and we must substitute h 2 ∇ 2 ϕ + 2μ ( ih ∂/∂ t + εV) ϕ + ih ε/ c ((K. grad) ϕ + (grad. K) ϕ ) = 0. (2)

A self-calibration method for rotary tables’ five degrees-of-freedom error motions

Measurement ◽  
2021 ◽  
Vol 174 ◽  
pp. 109067
Author(s):  
Zhi-Feng Lou ◽  
Li Liu ◽  
Ji-Yun Zhang ◽  
Kuang-chao Fan ◽  
Xiao-Dong Wang
Keyword(s):  
Degrees Of Freedom ◽  
Calibration Method ◽  
Self Calibration
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