Calculation of Kstopped− absorption yields on light nuclei

2019 ◽  
Vol 28 (07) ◽  
pp. 1950060
Author(s):  
Morteza Raeisi ◽  
Jafar Esmaili
Keyword(s):  
Atomic Number ◽  
Cascade Model ◽  
The Other ◽  
Light Nuclei ◽  
Natural Width ◽  
Transition Formula ◽  
Low Sensitivity ◽  
Radiation Transition

This paper describes an atomic cascade model which is used to predict the absorption yields for a kaon at low orbits in [Formula: see text]Li,9Be,[Formula: see text]C and [Formula: see text]O nuclei. The calculations show that most of the absorptions occur in [Formula: see text] and [Formula: see text] states so that their contribution adds up to 100% for [Formula: see text]O. However, for all of the targets, absorption in the other states is nearly zero. Also by increasing atomic number of target [Formula: see text], the yield of [Formula: see text] states decreases while it increases for the [Formula: see text] states. The results also display a low sensitivity on the widths of 4[Formula: see text] state (0.1%), in which it is comparable with the natural width of the radiation transition [Formula: see text].

An Overview of the Interdiffusion Studies in Mo-Si and W-Si Systems

2014 ◽  
Vol 354 ◽  
pp. 79-83
Author(s):  
Soumitra Roy ◽  
Soma Prasad ◽  
Aloke Paul
Keyword(s):  
Crystal Structures ◽  
Atomic Number ◽  
Diffusion Coefficients ◽  
Relative Increase ◽  
The Other ◽  
Reactive Diffusion ◽  
Refractory Elements ◽  
Other Hand ◽  
Two Systems ◽  
Diffusion Rates

The growth of phases by reactive diffusion in Mo-Si and W-Si systems are compared. The crystal structures of MSi2 and M5Si3 phases (M = Mo, W) are similar in these two systems. However, the diffusion rates of the components change systematically with a change in the atomic number. Integrated diffusion coefficients in both phases increase with an increasing atomic number of refractory elements i.e. from Mo to W. On the other hand, the ratio of diffusivities of the components decreases. This indicates a relative increase in the diffusion rates of the metal components with increasing atomic number and a difference in defects concentrations in these two systems.

scholarly journals Non-Destructive Monitoring of P. fluorescens and S. epidermidis Biofilm under Different Media by Fourier Transform Infrared Spectroscopy and Other Corroborative Techniques

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 930
Author(s):  
Marco Consumi ◽  
Kamila Jankowska ◽  
Gemma Leone ◽  
Claudio Rossi ◽  
Alessio Pardini ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Staphylococcus Epidermidis ◽  
Biofilm Formation ◽  
Early Stage ◽  
Deionized Water ◽  
The Other ◽  
Ftir Technique ◽  
Low Sensitivity ◽  
Non Destructive ◽  
Peculiar Behavior

In the present study, the early stage of bacteria biofilm formation has been studied as a function of different nutrients. Infrared spectra of Pseudomonas fluorescens (PF) and Staphylococcus epidermidis (SE), on germanium ATR crystal, were collected under deionized water H2O, phosphate buffered solution (PBS) and PBS with glucose (PBS-G). In H2O, protein bands of PF increased while, no difference in PBS and PBS-G were observed until 135 min. SE strain showed a low sensitivity to PBS composition starting to expose proteins on surfaces after 120 min. SE shows a low polysaccharides increase in H2O while, in bare and enriched PBS their intensity increases after 120 and 75 min. in PBS and PBS-G respectively. PF exhibits a peculiar behavior in H2O where the saccharide bands increased strongly after 100 min, while under all the other conditions, the intensity of polysaccharide bands increased up to the plateau probably because the layer of the biofilm exceeded the penetration capability of FTIR technique. All data suggest that, under lack of nutrients, both the bacteria tend to firmly anchor themselves to the support using proteins.

scholarly journals RADIOACTIVE UHECR ASTRONOMY: CORRELATING GAMMA ANISOTROPY AND NEUTRINO PEV EVENTS

2013 ◽  
Vol 53 (A) ◽  
pp. 718-723
Author(s):  
Daniele Fargion
Keyword(s):  
Cosmic Rays ◽  
Galactic Plane ◽  
Atmospheric Neutrino ◽  
High Energy ◽  
The Other ◽  
Light Nuclei ◽  
Ultra High Energy ◽  
Wide Spread ◽  
High Energy Cosmic Rays ◽  
Narrow Angle

UHECR (Ultra High Energy Cosmic Rays) were expected to be protons, to fly straight and to suffer of a GZK (opacity on CMB radiation) cut off. AUGER did suggest on 2007 that such early UHECR anisotropy was compatible with the foreseen Super-Galactic plane while both HIRES and AUGER confirmed such apparent GZK cut-off in the spectra. However the same AUGER composition since 2007 was favoring nuclei (and not nucleon). The recent absence of narrow angle clustering in UHECR maps, as it should be expected by protons, the missing of events along nearest Cluster Virgo, the wide spread (16°) angle of UHECR along CenA are in disagreement with first proton–UHECR AUGER understanding. We claimed since 2008 a light nuclei role for CenA crowded area. On the other side the ICECUBE absence of TeVs neutrino clustering or anisotropy, its spectra steepening is favoring mostly a ruling atmospheric neutrino noise up to tens TeV. However recent two PeV neutrino event cannot easily coexist or being extrapolate with such atmospheric ruling scenario, nor with GZK (either nucleon or nuclei) secondaries expected spectra. Finally tens TeV gamma anisotropy in ARGO–MILAGRO–ICECUBE maps may hardly be associated with known hadronic sources. We<br />imagine such anisotropy ruled by diffused gamma secondaries, being shine along UHECR bending and flight: radioactive light and heavy UHECR nuclei, while decaying in flight, may paint in the sky (by gamma, electrons and neutrinos) their trajectories and bending, connecting UHECR spread events with TeV anisotropy, as well offering a very realistic source of first, otherwise puzzling, observed PeV neutrinos.

Fitting Ellipse Based on the Dual Conic Model

2013 ◽  
Vol 670 ◽  
pp. 80-84
Author(s):  
C. Zhao ◽  
Mao Li Fu ◽  
J.T. Cheng
Keyword(s):  
Computational Efficiency ◽  
Dual Space ◽  
The Other ◽  
Dual Representation ◽  
Conic Model ◽  
Gradient Information ◽  
Edge Points ◽  
Low Sensitivity

This paper presents an operator that fitting the parameters of ellipses features, and improves the computational efficiency. Based on the dual conic model, this operator directly uses the raw gradient information in the neighborhood of an ellipse’s boundary, which use tangent lines and to apply the estimation in the dual space, so that avoiding the step of precisely extracting individual edge points. Moreover, under the dual representation, the dual conic can easily be constrained to a dual ellipse when minimizing the algebraic distance. The operator presents low sensitivity to noise and is compared to other estimation approaches, which shows good results, the accuracy of this operator is the highest, the time of this operator is moderate that compared with the other methods, and fall within acceptable levels, and in the case of noise or blur, the algorithm have shown very good robustness, in the practical environment can fit the parameters of the ellipse accurately.

scholarly journals Extension of the Liège intranuclear-cascade model to reactions induced by light nuclei

2014 ◽  
Vol 90 (5) ◽  
Author(s):  
Davide Mancusi ◽  
Alain Boudard ◽  
Joseph Cugnon ◽  
Jean-Christophe David ◽  
Pekka Kaitaniemi ◽  
...  
Keyword(s):  
Cascade Model ◽  
Light Nuclei ◽  
Intranuclear Cascade

Midbrain MRI assessments in progressive supranuclear palsy subtypes

2019 ◽  
Vol 91 (1) ◽  
pp. 98-103 ◽  
Author(s):  
Marina Picillo ◽  
Maria Francesca Tepedino ◽  
Filomena Abate ◽  
Roberto Erro ◽  
Sara Ponticorvo ◽  
...  
Keyword(s):  
Progressive Supranuclear Palsy ◽  
Clinical Diagnosis ◽  
Sensitivity And Specificity ◽  
Diagnostic Value ◽  
The Other ◽  
Class Iii ◽  
Neuroimaging Biomarkers ◽  
Low Sensitivity ◽  
Richardson’S Syndrome

ObjectivesTo explore the role of the available midbrain-based MRI morphometric assessments in (1) differentiating among progressive supranuclear palsy (PSP) subtypes (PSP Richardson’s syndrome (PSP-RS), PSP with predominant parkinsonism (PSP-P) and the other variant syndromes of PSP (vPSP)), and (2) supporting the diagnosis of PSP subtypes compared with Parkinson’s disease (PD) and healthy controls (HC).MethodsSeventy-eight patients with PSP (38 PSP-RS, 21 PSP-P and 19 vPSP), 35 PD and 38 HC were included in the present analysis. Available midbrain-based MRI morphometric assessments were calculated for all participants.ResultsCurrent MRI midbrain-based assessments do not display an adequate sensitivity and specificity profile in differentiating PSP subtypes. On the other hand, we confirmed MR Parkinsonism Index (MRPI) and pons area to midbrain area ratio (P/M) have adequate diagnostic value to support PSP-RS clinical diagnosis compared with both PD and HC, but low sensitivity and specificity profile in differentiating PSP-P from PD as well as from HC. The same measures show acceptable sensitivity and specificity profile in supporting clinical diagnosis of vPSP versus HC but not versus PD. Similar findings were detected for the newer MRPI and P/M versions.ConclusionsFurther studies are warranted to identify neuroimaging biomarkers supporting the clinical phenotypic categorisation of patients with PSP. MRPI and P/M have diagnostic value in supporting the clinical diagnosis of PSP-RS.Classification of evidenceThis study provides class III evidence that available MRI midbrain-based assessments do not have diagnostic value in differentiating the Movement Disorder Society PSP subtypes.

scholarly journals ANTI-HYPERON POLARIZATION IN pA AND Σ-A COLLISIONS AND INTRINSIC ANTIDIQUARK STATE IN INCIDENT BARYON

2012 ◽  
Vol 21 (01) ◽  
pp. 1250001
Author(s):  
HUJIO NODA ◽  
TSUTOMU TASHIRO ◽  
SHIN-ICHI NAKARIKI
Keyword(s):  
Constituent Quark ◽  
Valence Quark ◽  
Cascade Model ◽  
The Other ◽  
Other Hand ◽  
Incident Nucleon

We discuss the relation between the polarization of inclusively produced (anti)hyperons and the incident baryon states in the framework of the constituent quark–diquark cascade model. We assume that there is an intrinsic diquark–antidiquark state in the incident baryon, in which the intrinsic diquark immediately fragments into a non-leading baryon and the antidiquark behaves as a valence constituent. It is also assumed that the valence (anti)diquark in the incident nucleon tends to combine selectively with a spin-down sea quark and, on the other hand, the spin-up valence quark in the projectile is chosen by a sea (anti)diquark in preference to the spin-down valence quark. It is found that the incident spin-1/2 baryon is mainly composed of a spin-0 valence diquark and a valence quark, and contains an intrinsic diquark–antidiquark state with a probability of about 7%.

Comparison of Experimental and Theoretical Intensities for a New X-Ray Tube for Light Element Analysis

1983 ◽  
Vol 27 ◽  
pp. 423-426 ◽  
Author(s):  
John Kikkert ◽  
Graham Hendry
Keyword(s):  
Atomic Number ◽  
Light Element ◽  
Fluorescence Spectrometry ◽  
Light Elements ◽  
Element Analysis ◽  
X Ray ◽  
Highly Sensitive ◽  
Low Sensitivity

While x-ray fluorescence spectrometry is a highly sensitive and highly repoducible method of analysing samples, its one weakness is its relatively low sensitivity for light elements. This is mainly due to two problems: firstly the low fluorescent yield of the low atomic number elements, and secondly to the inherent inefficiency of exciting these elements. While it is not possible to improve the fluorescent yield, considerable improvements in light element sensitivity can be achieved by improvements in x-ray tubes.

The angular distribution of γ-radiation from light nuclei I. Experimental

1949 ◽  
Vol 199 (1056) ◽  
pp. 56-73 ◽  
Keyword(s):  
Angular Distribution ◽  
Proton Energy ◽  
The Other ◽  
Light Nuclei ◽  
Proton Bombardment ◽  
Proton Capture ◽  
Γ Radiation ◽  
Experimental Procedure

The experimental procedure used in studying the angular distribution of γ-radiation produced by the proton bombardment of some light nuclei is described. Results are given for the radiation following proton capture by the nuclei Li 7 , Be 9 , C 12 , C 13 and for the radiation from the residual O 16* nucleus produced in the reaction F 19 ( p , α) O 16* . Proton energies between 300 and 1000 keV were available. The distribution of the radiation from Li 7 was investigated over the whole range of energies; in the other cases the distribution was measured at energies corresponding to resonance maxima for the processes. The main results are: reaction Li 7 ( p , γ) Be 8 Be 9 ( p , γ) B 10 C 12 ( p , γ) N 13 C 13 ( p , γ) N 14 F 19 ( p , α) O 16* proton energy (keV) 440 960 450 550 330, 470 and 670 590 870 angular distribution 1+ 0.05 cosθ 1 + 0.09 sin 2 θ isotropic isotropic isotropic 1 + 0.2 cos 2 θ 1 + 0.1 cos 2 θ

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