scholarly journals Recent results on implosions directly driven at λ = 0·26-μm laser wavelength

1992 ◽  
Vol 10 (4) ◽  
pp. 573-583 ◽  
Author(s):  
M. Koenig ◽  
V. Malka ◽  
E. Fabre ◽  
P. Hammerling ◽  
A. Michard ◽  
...  
Keyword(s):  
Neutron Emission ◽  
Fusion Reaction ◽  
Laser Wavelength ◽  
Reconstruction Technique ◽  
Size Determination ◽  
Core Size ◽  
Reaction Products ◽  
X Ray ◽  
Emission Core ◽  
Α Particles

New diagnostics were implemented on the implosion experiments performed at LULI to improve our measurements of hydroefficiencies: Neutron chronometry gives the time of emission of the fusion reaction products as measured from the peak of the laser pulse; thereby making it possible to correlate the neutron emission with X-ray emission. Core imaging, based upon a maximum entropy reconstruction technique, leads to core size determination and also is a promising diagnostic for wall nonuniformities induced by irradiation conditions. A simple model is developed to retrieve experimental spectra of α-particles.

scholarly journals Validation of nuclear reaction models for incident α-particles

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hartmut Machner
Keyword(s):  
Nuclear Reaction ◽  
Compound Nucleus ◽  
Neutron Emission ◽  
Cascade Model ◽  
The Other ◽  
Reaction Products ◽  
Exciton Model ◽  
Intranuclear Cascade ◽  
Reaction Models ◽  
Α Particles

AbstractTwo different models allowing the calculation of reaction products are confronted with data from α-particle induced reactions. Both models contain a pre-equilibrium part and an equilibrium or compound nucleus part. The models are the exciton model in form of a code written by the author and TALYS. The other model is the intranuclear cascade model in form of the Liege-Saclay formulation incorporated in the PHITS code. The data are angle-integrated proton spectra from reactions with α-particle energies below 720 MeV and excitation functions from multi neutron emission with α-particle energies below 200 MeV.

X-ray identification of fusion reaction products implanted in Al foils following 16O and 19F bombardment of 59Co foils

1980 ◽  
Vol 170 (1-3) ◽  
pp. 189-192
Author(s):  
A.W. Waltner ◽  
S.L. Varghese ◽  
J.E. Willis ◽  
S.M. Shafroth
Keyword(s):  
Fusion Reaction ◽  
Reaction Products ◽  
X Ray

scholarly journals Joining of SiO2 glass and 316L stainless steel using Bi–Ag-based active solders

2020 ◽  
Vol 56 (4) ◽  
pp. 3444-3454
Author(s):  
Felix Weber ◽  
Markus Rettenmayr
Keyword(s):  
Stainless Steel ◽  
Cross Sections ◽  
316L Stainless Steel ◽  
Dissimilar Materials ◽  
Intermetallic Phases ◽  
Reaction Products ◽  
Cast State ◽  
Metallic Component ◽  
X Ray ◽  
Solder Interface

Abstract Active brazing is a commonly used method for joining dissimilar materials with at least one non-metallic component. In the present study, joining of SiO2 glass to 316L stainless steel was performed utilizing Bi–Ag-based solders. Ti up to a concentration of 4 and Mg up to 1 wt.% were added as active elements. Microstructures of the solder alloys in the as-cast state and of cross sections of the joined compounds were analysed using scanning electron microscopy and energy-dispersive X-ray spectroscopy. In the as-cast state of the solder, Ti is found in Bi–Ti intermetallic phases; Mg is partially dissolved in the fcc-(Ag) phase and additionally contained in a ternary Ag-Bi-Mg phase. After soldering, a tight joint was generated using several alloy compositions. Ti leads to the formation of reaction products at the steel/solder and glass/solder interfaces, and Mg is exclusively accumulated at the glass/solder interface.

Microtexture of shock reaction products of niobium and silica mixtures

1999 ◽  
Vol 14 (7) ◽  
pp. 3169-3174 ◽  
Author(s):  
Reiko Murao ◽  
Masae Kikuchi ◽  
Kiyoto Fukuoka ◽  
Eiji Aoyagi ◽  
Toshiyuki Atou ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Microscope ◽  
Shock Compression ◽  
Pressure Range ◽  
Reaction Products ◽  
Small Particles ◽  
Powder Mixtures ◽  
X Ray ◽  
Transmission Electron

Shock compression experiments on powder mixtures of niobium metal and quartz were conducted for the pressure range of 30–40 GPa by a 25-mm single-stage propellant gun. Chemical reaction occurred above 35 GPa, and products were found to be mainly so-called “Cu3Au-type” Nb3Si, which contained a small amount of oxygen. Microtextures of the specimen were examined by scanning and transmission electron microscopy. A field-emission transmission electron microscope was used for energy-dispersive x-ray analysis of microtextures in small particles found in the SiO2 matrix, and various species with different Nb/Si ratio and oxygen content were shown to be produced through the nonequilibrium process of shock compression.

Correlation of soft x‐ray spots with hard radiation and neutron emission in a 1‐kJ plasma focus

1974 ◽  
Vol 25 (10) ◽  
pp. 547-549 ◽  
Author(s):  
K. H. Schönbach ◽  
L. Michel ◽  
Heinz Fischer
Keyword(s):  
Plasma Focus ◽  
Neutron Emission ◽  
X Ray ◽  
Hard Radiation

scholarly journals Acid-beta-glycerophosphatase reaction products in the central nervous system mitochondria following x-ray irradiation.

1975 ◽  
Vol 23 (6) ◽  
pp. 402-410 ◽  
Author(s):  
L Roizin ◽  
D Orlovskaja ◽  
J C Liu ◽  
A L Carsten
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Acid Phosphatase ◽  
Enzyme Reaction ◽  
Reaction Products ◽  
Huntington's Chorea ◽  
X Ray ◽  
System A ◽  
Chemical Lesion ◽  
The Central Nervous System

A survey of the literature to date on the enzyme histochemistry of intracellular organelles has not yielded any reference to the presence of acid phosphatase reaction products in the mammalian mitochondria of the central nervous system. A combination of Gomori's acid phosphatase mehtod, however, with standard electron microscopy has disclosed the presence of enzyme reaction products in the mitochondria of the central nervous system of rats from 2 hr to 22 weeks after x-ray irradiation, as well as in a cerebral biopsy performed on a patient affected by Huntington's chorea. No enzyme reaction products, on the other hand, were observed in serial sections that had been incubated in substrates either containing sodium fluoride or lacking in beta-glycerophosphate. The abnormal mitochondrial enzyme reaction (chemical lesion) is considered to be the consequenco of the pathologic process affecting the ultrastructural-chemical organization of the organelle.

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