scholarly journals Corrigendum to “Cluster density slopes from Dark Matter-Baryons Energy Transfer” [Phys. Dark Univ. 33 (2021) 100847]

2022 ◽  
Vol 35 ◽  
pp. 100910
Author(s):  
Antonino Del Popolo ◽  
Morgan Le Delliou ◽  
Maksym Deliyergiyev
Keyword(s):  
Dark Matter ◽  
Energy Transfer ◽  
Cluster Density

scholarly journals Cluster density slopes from dark matter-baryons energy transfer

2021 ◽  
pp. 100847
Author(s):  
Antonino Del Popolo ◽  
Morgan Le Delliou
Keyword(s):  
Dark Matter ◽  
Energy Transfer ◽  
Cluster Density

scholarly journals Signatures of self-interacting dark matter on cluster density profile and subhalo distributions

2020 ◽  
Vol 2020 (02) ◽  
pp. 024-024 ◽  
Author(s):  
Arka Banerjee ◽  
Susmita Adhikari ◽  
Neal Dalal ◽  
Surhud More ◽  
Andrey Kravtsov
Keyword(s):  
Dark Matter ◽  
Density Profile ◽  
Cluster Density

scholarly journals Migdal effect and photon Bremsstrahlung: improving the sensitivity to light dark matter of liquid argon experiments

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
G. Grilli di Cortona ◽  
A. Messina ◽  
S. Piacentini
Keyword(s):  
Dark Matter ◽  
Energy Transfer ◽  
Bayesian Approach ◽  
Liquid Argon ◽  
Weakly Interacting Massive Particles ◽  
Bremsstrahlung Photon ◽  
Search Region ◽  
Simulated Experiment ◽  
The Earth ◽  
Ultimate Limit

Abstract The search for dark matter weakly interacting massive particles with noble liquids has probed masses down and below a GeV/c2. The ultimate limit is represented by the experimental threshold on the energy transfer to the nuclear recoil. Currently, the experimental sensitivity has reached a threshold equivalent to a few ionization electrons. In these conditions, the contribution of a Bremsstrahlung photon or a so-called Migdal electron due to the sudden acceleration of a nucleus after a collision might be sizable. In the present work, we use a Bayesian approach to study how these effects can be exploited in experiments based on liquid argon detectors. In particular, taking inspiration from the DarkSide-50 public spectra, we develop a simulated experiment to show how the Migdal electron and the Bremsstrahlung photon allow to push the experimental sensitivity down to masses of 0.1 GeV/c2, extending the search region for dark matter particles of previous results. For these masses we estimate the effect of the Earth shielding that, for strongly interacting dark matter, makes any detector blind. Finally, we show how the sensitivity scales for higher exposure.

A quantitative approach to inner shell losses

1978 ◽  
Vol 36 (1) ◽  
pp. 526-527 ◽  
Author(s):  
R.D. Leapman ◽  
P. Rez ◽  
D.F. Mayers
Keyword(s):  
Energy Transfer ◽  
Cross Section ◽  
Cross Sections ◽  
Accurate Determination ◽  
Background Intensity ◽  
Core Excitation ◽  
Quantitative Basis ◽  
Cross Section Differential ◽  
Bound Electrons

Microanalysis by EELS has been developing rapidly and though the general form of the spectrum is now understood there is a need to put the technique on a more quantitative basis (1,2). Certain aspects important for microanalysis include: (i) accurate determination of the partial cross sections, σx(α,ΔE) for core excitation when scattering lies inside collection angle a and energy range ΔE above the edge, (ii) behavior of the background intensity due to excitation of less strongly bound electrons, necessary for extrapolation beneath the signal of interest, (iii) departures from the simple hydrogenic K-edge seen in L and M losses, effecting σx and complicating microanalysis. Such problems might be approached empirically but here we describe how computation can elucidate the spectrum shape.The inelastic cross section differential with respect to energy transfer E and momentum transfer q for electrons of energy E0 and velocity v can be written as

Formation Mechanisms for Multiply Twinned Particles During Nucleation in the Au/MICA System

1975 ◽  
Vol 33 ◽  
pp. 84-85
Author(s):  
Eal H. Lee ◽  
Helmut Poppa
Keyword(s):  
Deposition Time ◽  
High Vacuum ◽  
Dark Field ◽  
Ultra High Vacuum ◽  
Formation Mechanisms ◽  
Heat Treated ◽  
Cluster Density ◽  
Diffraction Patterns ◽  
Crystal Particle ◽  
Multiply Twinned Particles

The formation of thin films of gold on mica has been studied in ultra-high vacuum (5xl0-10 torr) . The mica substrates were heat-treated for 24 hours at 375°C, cleaved, and annealed for 15 minutes at the deposition temperature of 300°C prior to deposition. An impingement flux of 3x1013 atoms cm-2 sec-1 was used. These conditions were found to give high number densities of multiple twin particles and are based on a systematic series of nucleation experiments described elsewhere. Individual deposits of varying deposition time were made and examined by bright and dark field TEM after "cleavage preparation" of highly transparent specimens. In the early stages of growth, the films generally consist of small particles which are either single crystals or multiply twinned; a strong preference for multiply twinned particles was found whenever the particle number densities were high. Fig. 1 shows the stable cluster density ns and the variation with deposition time of multiple twin particle and single crystal particle densities, respectively. Corresponding micrographs and diffraction patterns are shown in Fig. 2.

Influence of adiabatic interactions on the energy transfer in molecular collisions)

Physica ◽  
1954 ◽  
Vol 3 (7-12) ◽  
pp. 1169-1180
Author(s):  
F DEWETTE ◽  
Z SLAWSKY
Keyword(s):  
Energy Transfer ◽  
Molecular Collisions
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