Muonic X rays and capture γ rays in 89Y

1970 ◽  
Vol 48 (24) ◽  
pp. 3029-3037 ◽  
Author(s):  
D. Kessler ◽  
R. J. McKee ◽  
C. K. Hargrove ◽  
E. P. Hincks ◽  
H. L. Anderson
Keyword(s):  
High Resolution ◽  
Dirac Equation ◽  
Charge Distribution ◽  
Nuclear Charge ◽  
Atomic Transition ◽  
X Rays ◽  
Transition Energies ◽  
Line Intensities ◽  
Cascade Calculation ◽  
Γ Rays

The main mu-atomic transition energies in 89Y were measured with a high-resolution Ge(Li) spectrometer. The nuclear charge parameters of yttrium were derived by fitting the observed transition energies to those obtained by numerically solving the Dirac equation, using a radially symmetric Fermi charge distribution. The line intensities were also measured and shown to agree reasonably well with the results of a cascade calculation. Finally, we measured the energies and intensities of the most prominent capture γ rays. Most of these γ rays could be assigned to known transitions in the strontium isotopes 86 through 89.

Mu-Mesonic X-Rays and the Shape of the Nuclear Charge Distribution

1954 ◽  
Vol 94 (6) ◽  
pp. 1617-1629 ◽  
Author(s):  
David L. Hill ◽  
Kenneth W. Ford
Keyword(s):  
Charge Distribution ◽  
Nuclear Charge ◽  
X Rays ◽  
Nuclear Charge Distribution

Nuclear Charge Distribution in Calcium from Electron Scattering and Muonic X Rays

1964 ◽  
Vol 136 (3B) ◽  
pp. B589-B596 ◽  
Author(s):  
D. G. Ravenhall ◽  
Robert Herman ◽  
B. C. Clark
Keyword(s):  
Charge Distribution ◽  
Electron Scattering ◽  
Nuclear Charge ◽  
X Rays ◽  
Nuclear Charge Distribution

Studies of gamma-ray transitions in 146Eu

1976 ◽  
Vol 54 (2) ◽  
pp. 197-204 ◽  
Author(s):  
P. Sen ◽  
M. Kingman ◽  
H. Bakhru ◽  
N. Cue
Keyword(s):  
High Resolution ◽  
Level Scheme ◽  
Gamma Ray ◽  
X Rays ◽  
Accurate Evaluation ◽  
X Ray ◽  
Correlation Studies ◽  
Γ Rays ◽  
Γ Ray

The decay of 146Gd to levels of 146Eu has been studied using high resolution X-ray and γ-ray detectors. γ–γ directional correlation studies, using X and γ-ray Ge(Li) detectors, were made to assign the spins of the low lying states in 146Eu. γ–γ coincidence experiments with two Ge(Li) detectors and between Eu X rays and γ rays were performed to pin down the levels of 146Eu. On the basis of these measurements, Jπ of 4−, 3−, 2−, and 1− have been assigned respectively to the ground, 115.66, 230.51, and 385.11 keV states in 146Eu. More accurate evaluation of the E2 admixtures in the M1 transitions, 114.85, 115.66, and 154.60 keV, have been obtained. Based on the above results a tentative level scheme for 146Eu has been proposed.

Benchmarked atomic data for astrophysics

2019 ◽  
Vol 15 (S350) ◽  
pp. 341-344
Author(s):  
Giulio Del Zanna
Keyword(s):  
High Resolution ◽  
Spectral Line ◽  
Extreme Ultraviolet ◽  
Stellar Atmospheres ◽  
Atomic Data ◽  
X Rays ◽  
Astrophysical Interest ◽  
X Ray ◽  
Line Intensities

AbstractThe recent calculations of atomic data for ions of astrophysical interest are reviewed with a focus on work performed in Cambridge. The calculations have been benchmarked against high-resolution laboratory and astrophysical spectra. A framework for assessing uncertainties in atomic data has also been developed. Long-standing discrepancies in predicted spectral line intensities have been resolved, and a significant number of levels in coronal ions have finally been identified, improving the modelling of the extreme-ultraviolet and soft X-ray spectral regions. Recent improvements based on collisional-radiative modelling are presented. They are relevant for the modelling of satellite lines in the X-rays and for solving the long-standing problems in the chromosphere-corona transition in stellar atmospheres.

scholarly journals Measurement of synchrotron-radiation-excited Kossel patterns

2016 ◽  
Vol 23 (1) ◽  
pp. 214-218 ◽  
Author(s):  
G. Bortel ◽  
G. Faigel ◽  
M. Tegze ◽  
A. Chumakov
Keyword(s):  
High Resolution ◽  
Dynamic Range ◽  
Structural Information ◽  
Photon Counting ◽  
Spot Size ◽  
Low Noise ◽  
X Rays ◽  
Technical Problems ◽  
Pixel Detectors ◽  
Exciting Beam

Kossel line patterns contain information on the crystalline structure, such as the magnitude and the phase of Bragg reflections. For technical reasons, most of these patterns are obtained using electron beam excitation, which leads to surface sensitivity that limits the spatial extent of the structural information. To obtain the atomic structure in bulk volumes, X-rays should be used as the excitation radiation. However, there are technical problems, such as the need for high resolution, low noise, large dynamic range, photon counting, two-dimensional pixel detectors and the small spot size of the exciting beam, which have prevented the widespread use of Kossel pattern analysis. Here, an experimental setup is described, which can be used for the measurement of Kossel patterns in a reasonable time and with high resolution to recover structural information.

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