Sensitivity tests on the rates of the excited states of positron decays during the rapid proton capture process of the one-zone X-ray burst model

2018 ◽  
Vol 970 ◽  
pp. 1-7 ◽  
Author(s):  
Rita Lau
Keyword(s):  
Excited States ◽  
Proton Capture ◽  
Capture Process ◽  
X Ray ◽  
Rapid Proton ◽  
Sensitivity Tests ◽  
The One

scholarly journals ENDPOINT OF rp PROCESS USING RELATIVISTIC MEAN FIELD APPROACH AND A NEW MASS FORMULA

2012 ◽  
Vol 21 (08) ◽  
pp. 1250074 ◽  
Author(s):  
CHIRASHREE LAHIRI ◽  
G. GANGOPADHYAY
Keyword(s):  
Mass Formula ◽  
Optical Potential ◽  
Mean Field ◽  
Proton Capture ◽  
Density Profiles ◽  
X Ray ◽  
Field Approach ◽  
Relativistic Mean Field ◽  
Rapid Proton ◽  
Rp Process

Densities from relativistic mean field calculations are applied to construct the optical potential and, hence calculate the endpoint of the rapid proton capture (rp) process. Mass values are taken from a new phenomenological mass formula. Endpoints are calculated for different temperature-density profiles of various X-ray bursters. We find that the rp process can produce significant quantities of nuclei upto around mass 95. Our results differ from existing works to some extent.

New Isotopes fromK78rFragmentation and the Ending Point of the Astrophysical Rapid-Proton-Capture Process

1995 ◽  
Vol 74 (23) ◽  
pp. 4611-4614 ◽  
Author(s):  
B. Blank ◽  
S. Andriamonje ◽  
S. Czajkowski ◽  
F. Davi ◽  
R. Del Moral ◽  
...  
Keyword(s):  
Proton Capture ◽  
Capture Process ◽  
Rapid Proton

scholarly journals Ground-State Proton Decay ofBr69and Implications for theSe68Astrophysical Rapid Proton-Capture Process Waiting Point

2011 ◽  
Vol 106 (25) ◽  
Author(s):  
A. M. Rogers ◽  
M. A. Famiano ◽  
W. G. Lynch ◽  
M. S. Wallace ◽  
F. Amorini ◽  
...  
Keyword(s):  
Ground State ◽  
Proton Decay ◽  
Proton Capture ◽  
Capture Process ◽  
Rapid Proton

scholarly journals IMPORTANCE OF Q-VALUES IN ASTROPHYSICAL RAPID PROTON CAPTURE PROCESS

2013 ◽  
Vol 28 (17) ◽  
pp. 1350076 ◽  
Author(s):  
CHIRASHREE LAHIRI ◽  
G. GANGOPADHYAY
Keyword(s):  
Optical Model ◽  
Mean Field ◽  
Reaction Rates ◽  
Nucleon Nucleon ◽  
Proton Capture ◽  
Capture Process ◽  
Relativistic Mean Field ◽  
Rapid Proton ◽  
Nucleon Nucleon Interaction ◽  
Q Values

The importance of measuring Q-values in rapid proton capture process has been investigated. The microscopic optical model, derived using a nucleon–nucleon interaction and densities from relativistic mean field (RMF) calculations, has been utilized to calculate the reaction rates. It has been observed that the Q-values involved in the reactions at waiting points at A = 60 and 64 are very important in determining the final abundance of the process. Some other Q-values also play a crucial role in the final abundance of nuclei near the end point of the process.

scholarly journals Alpha decay of 109I and the implications for the rapid-proton capture process

2009 ◽  
Author(s):  
Chiara Mazzocchi ◽  
Robert Grzywacz ◽  
S. N. Liddick ◽  
Krzysztof P. Rykaczewski ◽  
Hendrik Schatz ◽  
...  
Keyword(s):  
Alpha Decay ◽  
Proton Capture ◽  
Capture Process ◽  
Rapid Proton

αDecay ofI109and Its Implications for the Proton Decay ofSb105and the Astrophysical Rapid Proton-Capture Process

2007 ◽  
Vol 98 (21) ◽  
Author(s):  
C. Mazzocchi ◽  
R. Grzywacz ◽  
S. N. Liddick ◽  
K. P. Rykaczewski ◽  
H. Schatz ◽  
...  
Keyword(s):  
Proton Decay ◽  
Proton Capture ◽  
Capture Process ◽  
Rapid Proton

scholarly journals ZnOTe Compounds Grown by DC-Magnetron Co-Sputtering

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 570
Author(s):  
Olga Sánchez ◽  
Manuel Hernández-Vélez
Keyword(s):  
Molar Fraction ◽  
Variable Parameter ◽  
Point Of View ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sample Series ◽  
Solid Phases ◽  
The One ◽  
High Bulk ◽  
Substrate Sample

ZnOTe compounds were grown by DC magnetron cosputtering from pure Tellurium (Te) and Zinc (Zn) cathodes in O2/Ar atmosphere. The applied power on the Zn target was constant equal to 100 W, while the one applied on the Te target took two values, i.e., 5 W and 10 W. Thus, two sample series were obtained in which the variable parameter was the distance from the Te targets to the substrate. Sample compositions were determined by Rutherford Backscattering Spectroscopy (RBS) experiments. Structural analysis was done using X-Ray diffraction (XRD) spectrometry and the growth of the hexagonal w-ZnO phase was identified in the XRD spectra. RBS results showed high bulk homogeneity of the samples forming ZnOTe alloys, with variable Te molar fraction (MF) ranging from 0.48–0.6% and from 1.9–3.1% for the sample series obtained at 5 W and 10 W, respectively. The results reflect great differences between the two sample series, particularly from the structural and optical point of view. These experiments point to the possibility of Te doping ZnO with the permanence of intrinsic defects, as well as the possibility of the formation of other Te solid phases when its content increases. The results and appreciable variations in the band gap transitions were detected from Photoluminescence (PL) measurements.

scholarly journals Nanostructural Arrangements and Surface Morphology on Ureasil-Polyether Films Loaded with Dexamethasone Acetate

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1362
Author(s):  
Joao Augusto Oshiro ◽  
Angelo Lusuardi ◽  
Elena M. Beamud ◽  
Leila Aparecida Chiavacci ◽  
M. Teresa Cuberes
Keyword(s):  
Film Surface ◽  
Crystalline Phases ◽  
Essential Information ◽  
X Ray ◽  
Force Microscopy ◽  
Ether Oxygen ◽  
Dexamethasone Acetate ◽  
Poly Ethylene ◽  
The One ◽  
Poly Propylene

Ureasil-Poly(ethylene oxide) (ureasil-PEO500) and ureasil-Poly(propylene oxide) (u-PPO400) films, unloaded and loaded with dexamethasone acetate (DMA), have been investigated by carrying out atomic force microscopy (AFM), ultrasonic force microscopy (UFM), contact-angle, and drug release experiments. In addition, X-ray diffraction, small angle X-ray scattering, and infrared spectroscopy have provided essential information to understand the films’ structural organization. Our results reveal that while in u-PEO500 DMA occupies sites near the ether oxygen and remains absent from the film surface, in u-PPO400 new crystalline phases are formed when DMA is loaded, which show up as ~30–100 nm in diameter rounded clusters aligned along a well-defined direction, presumably related to the one defined by the characteristic polymer ropes distinguished on the surface of the unloaded u-POP film; occasionally, larger needle-shaped DMA crystals are also observed. UFM reveals that in the unloaded u-PPO matrix the polymer ropes are made up of strands, which in turn consist of aligned ~180 nm in diameter stiffer rounded clusters possibly formed by siloxane-node aggregates; the new crystalline phases may grow in-between the strands when the drug is loaded. The results illustrate the potential of AFM-based procedures, in combination with additional physico-chemical techniques, to picture the nanostructural arrangements in polymer matrices intended for drug delivery.

scholarly journals Determination of the Height of Hard X-Ray Sources in the Solar Atmosphere by Measurement of Photospheric Albedo Photons

1975 ◽  
Vol 68 ◽  
pp. 239-241
Author(s):  
John C. Brown ◽  
H. F. Van Beek
Keyword(s):  
Solar Atmosphere ◽  
The Other ◽  
X Ray ◽  
Theoretical Predictions ◽  
Source Models ◽  
The One

SummaryThe importance and difficulties of determining the height of hard X-ray sources in the solar atmosphere, in order to distinguish source models, have been discussed by Brown and McClymont (1974) and also in this Symposium (Brown, 1975; Datlowe, 1975). Theoretical predictions of this height, h, range between and 105 km above the photosphere for different models (Brown and McClymont, 1974; McClymont and Brown, 1974). Equally diverse values have been inferred from observations of synchronous chromospheric EUV bursts (Kane and Donnelly, 1971) on the one hand and from apparently behind-the-limb events (e.g. Datlowe, 1975) on the other.

CsOH and its Lighter Homologues – a Comparison

2014 ◽  
Vol 69 (11-12) ◽  
pp. 1229-1236
Author(s):  
Matthias Wörsching ◽  
Constantin Hoch
Keyword(s):  
Gas Phase ◽  
Room Temperature ◽  
Structure Type ◽  
Alkali Metal Hydroxide ◽  
X Ray ◽  
Raman Spectroscopic ◽  
Cesium Hydroxide ◽  
Free Ion ◽  
The One ◽  
First Time

Abstract Cesium hydroxide, CsOH, was for the first time characterised on the basis of single-crystal data. The structure is isotypic to the one of the room-temperature modification of NaOH and can be derived from the NaCl structure type thus allowing the comparison of all alkali metal hydroxide structures. Raman spectroscopic investigations show the hydroxide anion to behave almost as a free ion as in the gas phase. The X-ray investigations indicate possible H atom positions.

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