The Cross Section for Photo-Disintegration of the Deuteron at Low Energies

1950 ◽  
Vol 80 (2) ◽  
pp. 211-222 ◽  
Author(s):  
G. R. Bishop ◽  
C. H. Collie ◽  
H. Halban ◽  
A. Hedgran ◽  
K. Siegbahn ◽  
...  
Keyword(s):  
Cross Section ◽  
Low Energies ◽  
The Cross

Erratum: The Cross Section for Photo-Disintegration of the Deuteron at Low Energies

1951 ◽  
Vol 81 (4) ◽  
pp. 644-644 ◽  
Author(s):  
G. R. Bishop ◽  
C. H. Collie ◽  
H. Halban ◽  
A. Hedgran ◽  
K. Siegbahn ◽  
...  
Keyword(s):  
Cross Section ◽  
Low Energies ◽  
The Cross

scholarly journals Light WIMP Searches Involving Electron Scattering

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
J. D. Vergados ◽  
Ch. C. Moustakidis ◽  
Yeuk-Kwan E. Cheung ◽  
H. Ejiri ◽  
Yeongduk Kim ◽  
...  
Keyword(s):  
Dark Matter ◽  
Cross Section ◽  
Electron Scattering ◽  
Mass Range ◽  
Bound State ◽  
Particle Model ◽  
Electron Mass ◽  
Bound State Wave Function ◽  
Low Energies ◽  
The Cross

In the present work we examine the possibility of detecting electrons in light dark matter searches. These detectors are considered to be the most appropriate for detecting dark matter particles with a mass in the MeV region. We analyze theoretically some key issues involved in such detection. More specifically we consider a particle model involving WIMPs interacting with fermions via Z-exchange. We find that for WIMPs with mass in the electron mass range the cross section for WIMP-atomic electron scattering is affected by the electron binding. For WIMPs more than 20 times heavier than the electron, the binding affects the kinematics very little. As a result, many electrons can be ejected with energy which increases linearly with the WIMP mass, but the cross section is somewhat reduced depending on the bound state wave function employed. On the other hand for lighter WIMPs, the effect of binding is dramatic. More specifically at most 10 electrons, namely, those with binding energy below 10 eV, become available even in the case of WIMPs with a mass as large as 20 times the electron mass. Even fewer electrons contribute if the WIMPs are lighter. The cross section is, however, substantially enhanced by the Fermi function corrections, which become more important at low energies of the outgoing electrons. Thus events of 0.5–2.5 per kg-y become possible.

scholarly journals The Momentum Transfer Cross Section for Electrons in Argon in the Energy Range 0 - 4 eV

1977 ◽  
Vol 30 (1) ◽  
pp. 61 ◽  
Author(s):  
HB Milloy ◽  
RW Crompton ◽  
JA Rees ◽  
AG Robertson
Keyword(s):  
Momentum Transfer ◽  
Cross Section ◽  
Cross Sections ◽  
Scattering Length ◽  
Effective Range ◽  
Fitting Procedure ◽  
Low Energies ◽  
Range Theory ◽  
The Cross ◽  
Momentum Transfer Cross Section

The momentum transfer cross section for electron-argon collisions in the range 0–4 eV has been derived from an analysis of recent measurements of DT/μ as a function of E/N at 294 K (Milloy and Crompton 1977a) and W as a function of E/N at 90 and 293 K (Robertson 1977). Modified effective range theory was used in the fitting procedure at low energies. An investigation of the range of validity of this theory indicated that the scattering length and effective range were uniquely determined ,and hence the cross section could be accurately extrapolated to zero energy. It is concluded that for ε ≤ 0.1 eV the error in !he cross section is less than � 6 % and in the range 0.4 ≤ ε (eV) ≤ 0.4 the error is less than � 8 %. In the range 0.1 < ε (eV) < 0.4 the presence of the minimum makes it difficult to determine the errors in the cross section but it is estimated that they are less than −20 %, +12 %. It is demonstrated that no other reported cross sections are compatible with the experimental results used in the present derivation.

Ion-Molekül-Reaktionen und Ladungsaustausch bei Stößen von O– auf O2 / Ion-Molecule Reactions and Charge Transfer in Collisions of O– on O2

1977 ◽  
Vol 32 (1) ◽  
pp. 13-16
Author(s):  
D. Vogt ◽  
W. Dreves ◽  
J. Mischke
Keyword(s):  
Charge Transfer ◽  
Cross Section ◽  
Charge Exchange ◽  
Energy Region ◽  
Lower Energy ◽  
Sharp Maximum ◽  
Ion Molecule Reactions ◽  
Low Energies ◽  
Lower Energy Region ◽  
The Cross

Abstract Investigations of the cross section for the reaction O- + O2 → O2- + O have been made for laboratory kinetic energies 0-100 eV. The reaction shows a sharp maximum in the cross section at low energies (5 eV lab.). By the use of the primary ion 18O- it can be shown that above 20 eV (lab.) there is only charge exchange whereas in the lower energy region ion-molecule-reactions as well as charge exchange occure. The reaction O- + O2 → O+ + … has also been observed above 27 eV (lab.).

Inelastic collisions between ions and atoms

1952 ◽  
Vol 212 (1109) ◽  
pp. 235-248 ◽  
Keyword(s):  
Excited States ◽  
Cross Section ◽  
Cross Sections ◽  
Negative Ions ◽  
Inelastic Collisions ◽  
Electron Affinities ◽  
Atomic Collision ◽  
Low Energies ◽  
Low Energy Electron ◽  
The Cross

Charge-exchange cross-sections for H + , D + , O + 2 , H + 2 , O + , CO + and N + 2 in A; D + , O + and N + in Kr; D + , C + and Br + in Xe, and O + in H 2 O have been measured between 25 and 4000 eV energy by a method previously described. The normal atomic collision cross-sections rise to a maximum at a voltage which depends on the value of Δ E √ M for the process, M being the atomic mass and Δ E the energy defect of the reaction. Collisions between negative ions and atoms have been studied with the same apparatus, the cross-section of the detachment reaction X - + Y → X + e + Y — Δ E being obtained. For S - , Br - , I - , C - , P - , Li - in Ne, and H - in He, Ne, A, Kr, Xe, this rises with increasing energy of the incident ion. For O - in He, Ne, A, Kr, Xe, Cl - in He, Ne, A, Kr, Xe, and F - in Ne, Kr, Xe the cross-section at low energies is unexpectedly large for the value of Δ E √M. This may be interpreted as being due to the presence of excited states of these ions, of low electron affinities, in the beam. With O - , a low energy electron bombardment source gave smaller cross-sections, i.e. a smaller proportion of excited ions.

A New Approach to the Demonstration of Oxidase-Localization Using Tannic Acid Or Catechin

1973 ◽  
Vol 31 ◽  
pp. 698-699
Author(s):  
V. Mizuhira ◽  
Y. Futaesaku
Keyword(s):  
Cross Section ◽  
Tannic Acid ◽  
Elastic Fiber ◽  
The Other ◽  
New Approach ◽  
Tissue Block ◽  
Active Reaction ◽  
The Cross

Previously we reported that tannic acid is a very effective fixative for proteins including polypeptides. Especially, in the cross section of microtubules, thirteen submits in A-tubule and eleven in B-tubule could be observed very clearly. An elastic fiber could be demonstrated very clearly, as an electron opaque, homogeneous fiber. However, tannic acid did not penetrate into the deep portion of the tissue-block. So we tried Catechin. This shows almost the same chemical natures as that of proteins, as tannic acid. Moreover, we thought that catechin should have two active-reaction sites, one is phenol,and the other is catechole. Catechole site should react with osmium, to make Os- black. Phenol-site should react with peroxidase existing perhydroxide.

Energy Distribution in Electron Beams

1972 ◽  
Vol 30 ◽  
pp. 568-569
Author(s):  
Tamotsu Ohno
Keyword(s):  
Electron Beam ◽  
Energy Distribution ◽  
Cross Section ◽  
Integral Curve ◽  
Electron Beams ◽  
Electron Gun ◽  
Angular Divergence ◽  
Apparent Increase ◽  
Integral Width ◽  
The Cross

The energy distribution in an electron; beam from an electron gun provided with a biased Wehnelt cylinder was measured by a retarding potential analyser. All the measurements were carried out with a beam of small angular divergence (<3xl0-4 rad) to eliminate the apparent increase of energy width as pointed out by Ichinokawa.The cross section of the beam from a gun with a tungsten hairpin cathode varies as shown in Fig.1a with the bias voltage Vg. The central part of the beam was analysed. An example of the integral curve as well as the energy spectrum is shown in Fig.2. The integral width of the spectrum ΔEi varies with Vg as shown in Fig.1b The width ΔEi is smaller than the Maxwellian width near the cut-off. As |Vg| is decreased, ΔEi increases beyond the Maxwellian width, reaches a maximum and then decreases. Note that the cross section of the beam enlarges with decreasing |Vg|.

Research in the cross-section of community psychology and global climate change: A call for action

2009 ◽  
Author(s):  
Marci Culley ◽  
Holly Angelique ◽  
Courte Voorhees ◽  
Brian John Bishop ◽  
Peta Louise Dzidic ◽  
...  
Keyword(s):  
Climate Change ◽  
Cross Section ◽  
Global Climate Change ◽  
Community Psychology ◽  
Global Climate ◽  
The Cross

Experimental Studies Of Multilayer Glass Structures On Compression, Compression With Bending And Simple Bending

2019 ◽  
pp. 22-30
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Applied Load ◽  
Experimental Studies ◽  
Strength Properties ◽  
Research Topic ◽  
Normative Values ◽  
Laminated Glass ◽  
The Cross ◽  
Experimental Values

The work of multilayer glass structures for central and eccentric compression and bending are considered. The substantiation of the chosen research topic is made. The description and features of laminated glass for the structures investigated, their characteristics are presented. The analysis of the results obtained when testing for compression, compression with bending, simple bending of models of columns, beams, samples of laminated glass was made. Overview of the types and nature of destruction of the models are presented, diagrams of material operation are constructed, average values of the resistance of the cross-sections of samples are obtained, the table of destructive loads is generated. The need for development of a set of rules and guidelines for the design of glass structures, including laminated glass, for bearing elements, as well as standards for testing, rules for assessing the strength, stiffness, crack resistance and methods for determining the strength of control samples is emphasized. It is established that the strength properties of glass depend on the type of applied load and vary widely, and significantly lower than the corresponding normative values of the strength of heat-strengthened glass. The effect of the connecting polymeric material and manufacturing technology of laminated glass on the strength of the structure is also shown. The experimental values of the elastic modulus are different in different directions of the cross section and in the direction perpendicular to the glass layers are two times less than along the glass layers.

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