scholarly journals The SHEAL Diffuse X-ray Spectrometer Experiment

1990 ◽  
Vol 115 ◽  
pp. 376-379
Author(s):  
W. T. Sanders ◽  
S. L. Snowden ◽  
R. J. Edgar
Keyword(s):  
Energy Resolution ◽  
Low Energy ◽  
X Ray ◽  
X Ray Background ◽  
Better Than

AbstractThe Diffuse X-ray Spectrometer (DXS) experiment is part of NASA’s SHEAL 2 mission, scheduled to be flown as an attached Shuttle payload in 1992. The DXS is designed to measure the spectrum of the low energy (0.15 to 0.28 keV) diffuse x-ray background with energy resolution better than 0.01 keV. This paper describes the DXS experiment and presents the results of calculations of the anticipated data.

scholarly journals The Fluctuations of the Cosmic X-Ray Background as a Sensitive Tool to the Universal Source Distribution

1981 ◽  
Vol 94 ◽  
pp. 277-278
Author(s):  
P. Giommi ◽  
G. F. Bignami
Keyword(s):  
Low Energy ◽  
Experimental Results ◽  
Space Distribution ◽  
Source Distribution ◽  
X Ray ◽  
Definite Relation ◽  
Sensitive Tool ◽  
X Ray Background ◽  
Flux Curve

Recent experimental results (Giacconi et al, 79, Tananbaum et al 79) ascribe an increasingly important role to the contribution of discrete sources to the low-energy (few Kev) cosmic X-ray background (CXB). While the astrophysical nature of the objects involved is not yet clear, distant and powerful emitters like QSO play probably an important role (e.g. Setti and Woltjer 1979, Field 1980). For them, often the number-flux curve (LogN-LogS) provides useful hints on such properties as space distribution and/or evolution. For the case of the X-ray sources, moreover, a definite relation exists between their LogN-LogS and the granularity of the sky emission as described by the fluctuations of the X-ray background.

scholarly journals Evidence for a galactic component of the diffuse X-ray background

1970 ◽  
Vol 37 ◽  
pp. 280-288
Author(s):  
B. A. Cooke ◽  
R. E. Griffiths ◽  
K. A. Pounds
Keyword(s):  
Energy Range ◽  
Low Energy ◽  
Galactic Latitude ◽  
X Ray ◽  
Latitude Dependence ◽  
The Galaxy ◽  
X Ray Background

It is widely believed that the diffuse X-ray background, observed on several occasions over the energy range from 0.25 keV to above 1 MeV has an extragalactic origin. Evidence for this comes from the generally reported isotropy above several keV [1, 2, 3] and the observed galactic latitude dependence at 0.25 keV, believed to result from the interstellar attenuation of these low energy photons in passage through the Galaxy [4, 5].

scholarly journals Instruments optimizations for low energy Gamma-ray detection

2019 ◽  
Vol 209 ◽  
pp. 01044
Author(s):  
Gonzalo Rodriguez ◽  
Aldo Morselli
Keyword(s):  
Energy Range ◽  
Photon Energy ◽  
Chemical Evolution ◽  
Energy Resolution ◽  
Gamma Ray ◽  
Supernova Explosion ◽  
Low Energy ◽  
Previous Generation ◽  
Energy Gamma ◽  
Better Than

There is an experimental gap in the study of the non-thermal universe in the photon energy range from 0.3 to 100 MeV. We have analyzed the performance of a detector with unprecedented sensitivity, angular and energy resolution and combined with polarimetric capability to study of the most powerful Galactic and extragalactic sources and with a line sensitivity in the MeV energy range two orders of magnitude better than previous generation of instruments that can determine the origin of key isotopes fundamental for the understanding of supernova explosion and the chemical evolution of our Galaxy.

scholarly journals Features in the Soft X-ray Background

1990 ◽  
Vol 115 ◽  
pp. 146-155
Author(s):  
R. Rothenflug
Keyword(s):  
Energy Resolution ◽  
Line Emission ◽  
Spatial Variations ◽  
Emission Lines ◽  
X Ray ◽  
Hot Gas ◽  
The North ◽  
North Polar ◽  
X Ray Background ◽  
Japanese Group

AbstractThe soft X-ray background is explained in terms of emission coming from hot gas. Most of these soft X-ray data were obtained by proportional counters with a poor energy resolution. Instruments having the capability to resolve lines were only flown by two groups: a GSPC by a Japanese group and a SSD by a french-american collaboration. They both detected the 0 VII line emission coming from the soft X-ray background and so proved the thermal nature of the emission. The implications of these results on possible models for the local hot medium will be discussed. The same detectors observed part of the North Polar Spur. They detected emission lines coming from different species (0 VII,Fe XVII,Ne IX). Spatial variations of line ratios for this object could be due to non-equilibrium ionization effects.

scholarly journals Resonant inelastic X-ray scattering of magnetic excitations under pressure

2019 ◽  
Vol 26 (5) ◽  
pp. 1725-1732 ◽  
Author(s):  
Matteo Rossi ◽  
Christian Henriquet ◽  
Jeroen Jacobs ◽  
Christian Donnerer ◽  
Stefano Boseggia ◽  
...  
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Energy Resolution ◽  
Low Energy ◽  
Polarization Analysis ◽  
Magnetic Excitations ◽  
X Ray ◽  
X Ray Scattering ◽  
Sample Environment ◽  
Ray Scattering

Resonant inelastic X-ray scattering (RIXS) is an extremely valuable tool for the study of elementary, including magnetic, excitations in matter. The latest developments of this technique have mostly been aimed at improving the energy resolution and performing polarization analysis of the scattered radiation, with a great impact on the interpretation and applicability of RIXS. Instead, this article focuses on the sample environment and presents a setup for high-pressure low-temperature RIXS measurements of low-energy excitations. The feasibility of these experiments is proved by probing the magnetic excitations of the bilayer iridate Sr3Ir2O7 at pressures up to 12 GPa.

scholarly journals IRIXS Spectrograph: an ultra high-resolution spectrometer for tender RIXS

2021 ◽  
Vol 28 (4) ◽  
Author(s):  
Joel Bertinshaw ◽  
Simon Mayer ◽  
Frank-Uwe Dill ◽  
Hakuto Suzuki ◽  
Olaf Leupold ◽  
...  
Keyword(s):  
High Resolution ◽  
Energy Resolution ◽  
X Rays ◽  
Full Width ◽  
X Ray ◽  
X Ray Scattering ◽  
Imaging Approach ◽  
High Resolution Spectrometer ◽  
Resolution Spectrometer ◽  
Better Than

The IRIXS Spectrograph represents a new design of an ultra-high-resolution resonant inelastic X-ray scattering (RIXS) spectrometer that operates at the Ru L 3-edge (2840 eV). First proposed in the field of hard X-rays by Shvyd'ko [(2015), Phys. Rev. A, 91, 053817], the X-ray spectrograph uses a combination of laterally graded multilayer mirrors and collimating/dispersing Ge(111) crystals optics in a novel spectral imaging approach to overcome the energy resolution limitation of a traditional Rowland-type spectrometer [Gretarsson et al. (2020), J. Synchrotron Rad. 27, 538–544]. In combination with a dispersionless nested four-bounce high-resolution monochromator design that utilizes Si(111) and Al2O3(110) crystals, an overall energy resolution better than 35 meV full width at half-maximum has been achieved at the Ru L 3-edge, in excellent agreement with ray-tracing simulations.

EDS x-ray microcalorimeters with 13 eV energy resolution

1996 ◽  
Vol 54 ◽  
pp. 488-489
Author(s):  
D. A. Wollman ◽  
G. C. Hilton ◽  
K. D. Irwin ◽  
J. M. Martinis
Keyword(s):  
Energy Resolution ◽  
Temperature Rise ◽  
Energy Dispersive Spectroscopy ◽  
Transition Edge Sensor ◽  
Electrical Contact ◽  
Low Energy ◽  
Superconducting Transition ◽  
X Ray ◽  
Transition Edge ◽  
Eds Microanalysis

Although Si- and Ge-based Energy Dispersive Spectroscopy (EDS) detectors are by far the most commonly used x-ray spectrometers for microanalysis, they are limited by energy resolutions on the order of 100 eV. This low energy resolution is insufficient to clearly resolve many peak overlaps between Kα x-ray lines of different elements. In addition, many L and M lines of heavier elements fall in the 100 eV to 2 keV energy range, making it difficult in complicated spectra to identify and quantify the presence of technologically important lighter elements. Higher energy resolution and good count rates are necessary to provide improved limits of detectability.We are developing a cryogenic x-ray microcalorimeter with significantly improved energy resolution and a count rate and detector area suitable for EDS microanalysis. In a calorimeter, the energy of an x-ray is converted to heat, and a measurement of the temperature rise of the detector gives the deposited photon energy. Our microcalorimeter detector consists of a normal-metal x-ray absorber which is in thermal and electrical contact with a superconducting transition-edge sensor (TES).

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