Yield Curves for Li + Li and Li + Be Nuclear Reactions

The present work describes a method to determine excitation function curves and, therefore, cross-sections, making use of the irradiation of liquid targets at distinct energies in a biomedical cyclotron. The method relies on the derivative of experimentally measured thick target yield curves to determine the corresponding excitation function curves. The technique is presented as a valid and practical alternative to the commonly used activation method combined with the stack monitor technique, whose implementation in liquid targets offers practical difficulties. The working principle is exemplified by presenting the results obtained for the clinically relevant 68Zn(p,n)68Ga and the 64Zn(p,α)61Cu nuclear reactions, obtained though the irradiation of liquid targets containing dissolved natural zinc.

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Nuclear Processes Related to the Ap Stars and the Heaviest Chemical Elements

International Astronomical Union Colloquium ◽

10.1017/s0252921100080520 ◽

1976 ◽

Vol 32 ◽

pp. 169-182

Author(s):

B. Kuchowicz

Keyword(s):

Nuclear Physics ◽

Nuclear Reactions ◽

Chemical Elements ◽

Fission Products ◽

Abundance Pattern ◽

Isotopic Shifts ◽

Processed Material ◽

R Process ◽

Ap Stars ◽

Nuclear Processes

SummaryIsotopic shifts in the lines of the heavy elements in Ap stars, and the characteristic abundance pattern of these elements point to the fact that we are observing mainly the products of rapid neutron capture. The peculiar A stars may be treated as the show windows for the products of a recent r-process in their neighbourhood. This process can be located either in Supernovae exploding in a binary system in which the present Ap stars were secondaries, or in Supernovae exploding in young clusters. Secondary processes, e.g. spontaneous fission or nuclear reactions with highly abundant fission products, may occur further with the r-processed material in the surface of the Ap stars. The role of these stars to the theory of nucleosynthesis and to nuclear physics is emphasized.

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Nuclear Reactions in Deuterium Titanium

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100134260 ◽

1990 ◽

Vol 48 (2) ◽

pp. 134-135

Author(s):

D.M. Vanderwalker

Keyword(s):

Nuclear Reactions ◽

Ion Beam ◽

Exothermic Reaction ◽

Pure Titanium ◽

Fundamental Interest ◽

Transmission Electron ◽

Iodide Titanium ◽

A Cell ◽

After Hours ◽

Quantity Of Heat

There is a fundamental interest in electrochemical fusion of deuterium in palladium and titanium since its supposed discovery by Fleischmann and Pons. Their calorimetric experiments reveal that a large quantity of heat is released by Pd after hours in a cell, suggesting fusion occurs. They cannot explain fusion by force arguments, nor can it be an exothermic reaction on the formation of deuterides because a smaller quantity of heat is released. This study examines reactions of deuterium in titanium.Both iodide titanium and 99% pure titanium samples were encapsulated in vacuum tubes, annealed for 2h at 800 °C. The Ti foils were charged with deuterium in a D2SO4 D2O solution at a potential of .45V with respect to a calomel reference junction. Samples were ion beam thinned for transmission electron microscopy. The TEM was performed on the JEOL 200CX.The structure of D charged titanium is α-Ti with hexagonal and fee deuterides.

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The evolution of the microstructure of 600 Mev proton irradiated materials

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100178148 ◽

1990 ◽

Vol 48 (4) ◽

pp. 1002-1003

Author(s):

R. Gotthardt ◽

A. Horsewell ◽

F. Paschoud ◽

S. Proennecke ◽

M. Victoria

Keyword(s):

Nuclear Reactions ◽

Dislocation Loops ◽

Defect Clusters ◽

Weak Beam ◽

Stacking Fault Tetrahedra ◽

Small Defect ◽

Sufficient Intensity ◽

Reactor Materials ◽

Metallic Impurities ◽

Beam Technique

Fusion reactor materials will be damaged by an intense field of energetic neutrons. There is no neutron source of sufficient intensity at these energies available at present, so the material properties are being correlated with those obtained in irradiation with other irradiation sorces. Irradiation with 600 MeV protons produces both displacement damage and impurities due to nuclear reactions. Helium and hydrogen are produced as gaseous impurities. Other metallic impurities are also created . The main elements of the microstructure observed after irradiation in the PIREX facility, are described in the following paragraphs.A. Defect clusters at low irradiation doses: In specimens irradiated to very low doses (1021-1024 protons.m-2), so that there is no superimposition of contrast, small defect clusters have been observed by the weak beam technique. Detailed analysis of the visible contrast (>0.5 nm diameter) revealed the presence of stacking fault tetrahedra, dislocation loops and a certain number of unidentified clusters . Typical results in Cu and Au are shown in Fig. 1.

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On the many-body theory of nuclear reactions

Nuclear Physics A ◽

10.1016/s0375-9474(68)91896-4 ◽

1968 ◽

Vol 111 (1) ◽

pp. 392-416 ◽

Cited By ~ 2

Author(s):

K DIETRICH ◽

K HARA

Keyword(s):

Nuclear Reactions ◽

Many Body ◽

Many Body Theory ◽

The Many ◽

Body Theory

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The cross sections for different channels in heavy ion nuclear reactions

Journal de Physique ◽

10.1051/jphys:019710032010700 ◽

1971 ◽

Vol 32 (1) ◽

pp. 7-9 ◽

Cited By ~ 21

Author(s):

J. Galin ◽

D. Guerreau ◽

M. Lefort ◽

X. Tarrago

Keyword(s):

Cross Sections ◽

Nuclear Reactions ◽

Heavy Ion ◽

The Cross

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Modeling the green bond yield on bond offering

Finance and Credit ◽

10.24891/fc.26.12.2858 ◽

2020 ◽

Vol 26 (12) ◽

pp. 2858-2878

Author(s):

M.I. Emets

Keyword(s):

Linear Regression ◽

Yield Curve ◽

Bond Market ◽

Third Party ◽

Bond Pricing ◽

Market Development ◽

Fair Price ◽

Lower Yield ◽

Yield Curves ◽

Bond Yield

Subject. The article addresses the green bond pricing as compared to bonds other than green ones. Objectives. The aims are to determine how the fact that a bond is identified as a green one, the issue amount, and the availability of third-party verification, influence the yield to maturity; to make recommendations on effective green bond pricing. Methods. The study employs econometric testing of hypotheses, using the multiple linear regression. The sample includes 318 green and 1695 conventional bonds. Results. Green bonds have a lower yield to maturity in comparison with conventional bonds. The yield to maturity of green bonds with third-party verification is lower, as contrasted with green bonds without verification. Conclusions. The next step in the green bond market development is creating a benchmark yield curve for sovereign green bonds, with parallel issuance of conventional, non-green bonds. The yield curve is crucial for effective bond pricing. Two yield curves, i.e. for green and non-green bonds, will enable investors to estimate the fair price on issuance, as well as to define, if there is a difference in pricing.

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