Relativistic atomic form factors and photon coherent scattering cross sections

1979 ◽  
Vol 8 (1) ◽  
pp. 69-106 ◽  
Author(s):  
J. H. Hubbell ◽  
I. O/verbo/
Keyword(s):  
Cross Sections ◽  
Form Factors ◽  
Coherent Scattering ◽  
Scattering Cross ◽  
Scattering Cross Sections

Coherent and incoherent scattering of low-energy X-ray photons in the atomic region 13 ≤ Z ≤ 82

1996 ◽  
Vol 74 (1-2) ◽  
pp. 10-16 ◽  
Author(s):  
D. V. Rao ◽  
R. Cesareo ◽  
G. E. Gigante ◽  
D. V. Rao ◽  
G. E. Gigante
Keyword(s):  
Cross Sections ◽  
Detection System ◽  
Form Factors ◽  
Coherent Scattering ◽  
Incoherent Scattering ◽  
X Rays ◽  
Bremsstrahlung Radiation ◽  
X Ray ◽  
Scattering Cross ◽  
Scattering Cross Sections

Coherent- and incoherent-scattering cross sections for the elements Al, Cu, Y, In, Au, and Pb were measured using nearly monoenergetic unpolarized 35.86 and 39.96 keV X-ray beams with high-resolution Si (Li) detectors. Bremsstrahlung radiation from an X-ray tube was used to excite nearly monoenergetic X-rays in secondary targets. To improve the efficiency of the detection system the excitation source, detector, and the target assembly were placed in a vacuum chamber and a pressure of 10−2 mbar was maintained throughout the measurements. This system considerably reduced the background and scattering effects and improved the monochromacy. Experimental coherent-scattering cross sections are compared with the normalized integrated coherent-scattering cross sections calculated using the relativistic, nonrelativistic, and relativistic-modified form factors. Experimental incoherent-scattering cross sections are compared with the theoretical values, calculated using the nonrelativistic incoherent-scattering function. Good correspondence is observed between experimental and theoretical values in the given energy region.

Neutron Reflecting Mirrors for Determining Coherent Scattering Cross Sections

1956 ◽  
Vol 27 (8) ◽  
pp. 620-622 ◽  
Author(s):  
C. J. Heindl ◽  
I. W. Ruderman ◽  
J. M. Ostrowski ◽  
J. R. Ligenza ◽  
D. M. Gardner
Keyword(s):  
Cross Sections ◽  
Coherent Scattering ◽  
Scattering Cross ◽  
Scattering Cross Sections

Streuung langsamer Neutronen an Lanthan und Cer

1982 ◽  
Vol 37 (10) ◽  
pp. 1132-1138
Author(s):  
K. Knopf ◽  
W. Waschkowski
Keyword(s):  
Neutron Energy ◽  
Cross Sections ◽  
Coherent Scattering ◽  
Resonance Parameters ◽  
Filter Technique ◽  
Scattering Cross ◽  
Scattering Lengths ◽  
Scattering Cross Sections

The coherent scattering lengths b for the bound atom were measured by the Christiansen filter technique for natural Lanthanum and Cerium and the Cerium isotopes. In addition the free scattering cross sections at zero neutron energy could be determined. We obtained the following data:By comparison with the resonance parameters the potential radii could be derived and discussed.

scholarly journals Recasting direct detection limits within micrOMEGAs and implication for non-standard dark matter scenarios

2021 ◽  
Vol 81 (3) ◽  
Author(s):  
G. Bélanger ◽  
A. Mjallal ◽  
A. Pukhov
Keyword(s):  
Dark Matter ◽  
Elastic Scattering ◽  
Velocity Distribution ◽  
Cross Sections ◽  
Direct Detection ◽  
Cosmological Parameters ◽  
Form Factors ◽  
Scattering Cross ◽  
Upper Limits ◽  
Scattering Cross Sections

AbstractDirect detection experiments obtain 90% upper limits on the elastic scattering cross sections of dark matter with nucleons assuming point-like interactions and standard astrophysical and cosmological parameters. In this paper we provide a recasting of the limits from XENON1T, PICO-60, CRESST-III and DarkSide-50 and include them in micrOMEGAs. The code can then be used to directly impose constraints from these experiments on generic dark matter models under different assumptions about the DM velocity distribution or on the nucleus form factors. Moreover, new limits on the elastic scattering cross sections can be obtained in the presence of a light t-channel mediator or of millicharged particles.

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