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257
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Indirect Approach To The H-2(d,p)H-3 Reaction Study
Sparta, R.; Pizzone, R. G.; Spitaleri, C.; Aliotta, M.; Burjan, Václav; Cherubini, S.; Crucilla, V.; Gulino, M.; Hons, Zdeněk; Kiss, G. G.; Kroha, Václav; La Cognata, M.; Lamia, L.; McCleskey, M.; Mrázek, Jaromír; Puglia, S. M. R.; Rapisarda, G. G.; Romano, S.; Sergi, M. L.; Trache, L.; Tumino, A.
2010 - anglický
In order to understand primordial and stellar nucleosynthesis, we have studied H-2(d,p)H-3 reaction at 0.4 MeV down to astrophysical energies. Knowledge of its S-factor is interesting also to plan reactions for fusion reactors to produce energy. The H-2(d,p)H-3 reaction has been studied through the Trojan Horse Method applied to the three-body reaction H-2(He-3,pt)H, at beam energy of 17 MeV. Once selection of protons and tritons detected in coincidence and the selection of quasi-free events, the obtained S-factor is compared with direct measurements. Such data are in agreement with the direct ones and a pole invariance test has been obtained comparing the present results with another H-2(d,p)H-3 THM measurements, where a different spectator particle was employed.
Klíčová slova:
nuclear astrohphysics; Trojan Horse; Big Bang nucleosynthesis
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Indirect Approach To The H-2(d,p)H-3 Reaction Study
In order to understand primordial and stellar nucleosynthesis, we have studied H-2(d,p)H-3 reaction at 0.4 MeV down to astrophysical energies. Knowledge of its S-factor is interesting also to plan ...
Spectroscopy of Medium-mass Hypernuclear Production
Motoba, T.; Bydžovský, Petr; Sotona, Miloslav; Itonaga, K.; Ogawa, K.; Hashimoto, O.
2010 - anglický
Theoretical hypernuclear photoproduction spectra are demonstrated by choosing typical medium-heavy nuclear targets such as Si-28, Ca-40, and Cr-52. The predictions provide us with interesting opportunities of spectroscopic study beyond p-shell on the dynamical coupling between a hyperon and nuclear core excitations.
Klíčová slova:
hypernuclear photoproduction; DWIA; unnatural parity states
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Spectroscopy of Medium-mass Hypernuclear Production
Theoretical hypernuclear photoproduction spectra are demonstrated by choosing typical medium-heavy nuclear targets such as Si-28, Ca-40, and Cr-52. The predictions provide us with interesting ...
Influence of Plastic Deformation on the Residual Stress Distribution and Fatigue Behaviour of High Strength Steels Welds
Mráz, Ľ.; Karlsson, L.; Hamak, I.; Mikula, Pavol; Vrána, Miroslav
2010 - anglický
The effects of plastic deformation and cyclic loading on residual stress distribution have been studied at welds in high strength 800 MPa steel. Effects of residual stress levels on fatigue life are also presented. Tensile loading was used to induce precisely controlled plastic deformation at weld toes. Residual stress distributions were measured by neutron diffraction. The influence of fatigue loading on the residual stress level was much smaller than that of plastic deformation. A large drop of residual stresses in the vicinity of the welds was recognised after local straining at the level of 2%. Stresses decreased with up to 550 MPa in the region around the weld toe. The effect of local plastic deformation on fatigue properties was also found to be significant. Fatigue strength more than doubled compared to the non-strained as-welded condition.
Klíčová slova:
neutron diffraction; residual stress
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Influence of Plastic Deformation on the Residual Stress Distribution and Fatigue Behaviour of High Strength Steels Welds
The effects of plastic deformation and cyclic loading on residual stress distribution have been studied at welds in high strength 800 MPa steel. Effects of residual stress levels on fatigue life are ...
Geometric Versus Spectral Convergence for the Neumann Laplacian under Exterior Perturbations of the Domain
Arrieta, J. M.; Krejčiřík, David
2010 - anglický
This chapter is concerned with the behavior of the eigenvalues and eigenfunctions of the Laplace operator in bounded domains when the domain undergoes a perturbation. It is well known that if the boundary condition that we are imposing is of Dirichlet type, the kind of perturbations that we may allow in order to obtain the continuity of the spectra is much broader than in the case of a Neumann boundary condition. This is explicitly stated in the pioneer work of Courant and Hilbert [CoHi53], and it has been subsequently clarified in many works, see [BaVy65, Ar97, Da03] and the references therein among others. See also [HeA06] for a general text on different properties of eigenvalues and [HeD05] for a study on the behavior of eigenvalues and in general partial differential equations when the domain is perturbed.
Klíčová slova:
eigenvalues; Laplace operator; Dirichlet condition
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Geometric Versus Spectral Convergence for the Neumann Laplacian under Exterior Perturbations of the Domain
This chapter is concerned with the behavior of the eigenvalues and eigenfunctions of the Laplace operator in bounded domains when the domain undergoes a perturbation. It is well known that if the ...
Photo- and electro-production of kaons
Bydžovský, Petr
2010 - anglický
Isobar models for the electromagnetic production of K+ and K-0 are discussed with emphasis on the K-0 photoproduction off neutron. Predictions of the models for the K-0 photoproduction on deuteron are compared with the recent data and some properties of the elementary amplitudes are shown.
Klíčová slova:
electromagnetic production; photoproduction; model
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Photo- and electro-production of kaons
Isobar models for the electromagnetic production of K+ and K-0 are discussed with emphasis on the K-0 photoproduction off neutron. Predictions of the models for the K-0 photoproduction on deuteron are ...
Some nanostructures created in PET-foils by track etching of low energy ions and fission fragments
Turek, Karel; Dajkó, G.; Orčíková, Hana
2009 - anglický
Klíčová slova:
nanostructures; PET-foils; track etching
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Some nanostructures created in PET-foils by track etching of low energy ions and fission fragments
Integrals of motion for quantum spin chains with elliptic Weierstrass function interaction
Dittrich, Jaroslav; Inozemtsev, V. I.
2009 - anglický
Two non-trivial integrals of motion are constructed for the spin chains with exchange interaction the coupling strengh being given by the Weierstrass elliptic function of the spins distance. Jsou sestrojeny dva netriviální integrály pohybu pro spinové řetězy s výměnnou interkcí, jejíž síla je dána Weierstrassovou eliptickou funkcí vzdálenosti spinů.
Klíčová slova:
spin chain; Weierstrass function; integral of motion
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Integrals of motion for quantum spin chains with elliptic Weierstrass function interaction
Two non-trivial integrals of motion are constructed for the spin chains with exchange interaction the coupling strengh being given by the Weierstrass elliptic function of the spins distance....
Scaling features in high energy hadron and nucleus collisions
Zborovský, Imrich; Tokarev, M. V.
2009 - anglický
Results of analysis of experimental data on inclusive cross sections of jets, direct photons, and high-pT hadrons produced in pp= ¯ pp and AA collisions are presented in the framework of zscaling. The data were obtained at ISR, S¯ppS, RHIC, and Tevatron. New properties of zpresentation of the inclusive spectra are discussed. A physical interpretation of the variable z and the scaling function y(z) is given. A microscopic scenario of hadron and nucleus collisions at a constituent level in terms of momentum fractions is developed. The z-scaling re ects the structure of the colliding objects, interaction of their constituents, and particle formation and manifests the general properties of self-similarity, locality, and fractality. The obtained results could be used for searching for new physics phenomena in high energy hadron and nucleus collisions in soft and hard regions at RHIC, Tevatron, and LHC.
Klíčová slova:
RHIC; LHC
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Scaling features in high energy hadron and nucleus collisions
Results of analysis of experimental data on inclusive cross sections of jets, direct photons, and high-pT hadrons produced in pp= ¯ pp and AA collisions are presented in the framework of zscaling. ...
Nuclear pore creation in pet-foils by means of ions from Tandetron accelerator
Turek, Karel; Dajkó, G.; Orčíková, Hana; Kovář, Ivan; Spurný, František
2008 - anglický
Klíčová slova:
Tandetron accelerator; irradiated foils; nuclear pore
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Nuclear pore creation in pet-foils by means of ions from Tandetron accelerator
Effect of ligands on the stability of the specific complex between estrogen receptor (protein) and estrogen response element (DNA) under irradiation
Štísová, Viktorie; Goffinont, S.; Spotheim-Maurizot, M.; Davídková, Marie
2008 - anglický
The overall stability of the specific complex between estrogen receptor protein and DNA estrogen response element under irradiation has been followed. The effect of ligands, estrogen and or tamoxifen, has been determined. Byla sledována celková stabilita specifického komplexu mezi proteinem receptorem estrogenů a DNA estrogen responsivním elementem po ozáření. Byl stanoven vliv ligandů, estrogenu a tamoxifenu.
Klíčová slova:
ionizing radiation; specific DNA-protein complex; estrogen receptor; estrogen response element
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Effect of ligands on the stability of the specific complex between estrogen receptor (protein) and estrogen response element (DNA) under irradiation
The overall stability of the specific complex between estrogen receptor protein and DNA estrogen response element under irradiation has been followed. The effect of ligands, estrogen and or tamoxifen, ...
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