Search results for "nuclear fusion"
showing 10 items of 437 documents
Messung der Spinpolarisation von 900 eV-Elektronen nach elastischer Streuung an Schwermetallfolien in Abh�ngigkeit von der Targettemperatur
1967
900 eV electrons are elastically scattered by solid targets of tungsten, platinum and gold. The angular dependence of the scattered intensity and of spin polarizationP(Θ) is investigated as a function of the target temperature. The influence of hydrogen on the scattering process by a gold target is investigated too.
Dispersion relations of wave modes in helium II layers
1973
Dispersion relations of (sound-like) wave modes, which can exist in a helium II layer of arbitrary width, are calculated numerically. The basis of our considerations is the complete system of the linearized Landau-Khalamikov equations, in which only the dissipative processes involved with η and ζ2 are taken into account. Apart from the linearization, no approximation or averaging is performed. The thermal expansion of helium II is taken into account. Symmetry properties of the velocities of flow, usually required, are dropped here. A hint is given as to how all the Khalatnikov coefficients may be measured by sound absorption experiments.
The triple-alpha-reaction at low temperatures.
1986
We have studied the triple-α-reaction at low temperatures which is of importance on accreting white dwarfs and neutron stars. Although we have improved a recent investigation of Nomoto, Thielemann and Miyaji on several points, we find a reaction rate for the relevant temperature range (T=107−108K) which is rather similar to the previous result. In particular, our improved study confirms that helium might be ignited on accreting white dwarfs at temperaturesT≦4.107 K.
Low-lying levels in the nuclei151Nd and155Sm
1984
Decay properties of excited states in the151Nd and155Sm nuclei produced by 10 MeV douterons have been investigated with in-beam gamma-gamma-coincidence equipment during bombardment of the150Nd and154Sm targets. The results largely confirm the data obtained earlier for these nuclei. The (d, p γ) reaction channel favors population of odd-parity low-spin levels, whose energies follow the rule of regular band structure for well-deformed nuclei. The level schemes are interpreted with calculations using an axial particle-rotor model with a Woods-Saxon potential.
g-Factor of theT 1/2=35 ns isomeric state in154Er
1983
The reaction32S+126Te has been used to determine theg-factor of theT 1/2=35 ns yrast isomeric state in154Er through the time-differential spin-rotation method. The experimental valueg=+0.017±0.003 agrees with an aligned two-neutron ν(i13/2,h9/2) main configuration and supports an 11− spin-parity assignment for the isomeric state. Unambiguous spin-parity assignment for upper energy yrast states can be deduced. The properties of the isomeric state are discussed.
Properties of isomeric states and the ?d 3/2-vi 13/2 multiplet in194Au
1977
The level structure of194Au has been studied by observing prompt and delayedγ-rays following194Pt(p,n) and195Pt(p,2n) reactions. The conversion electron andγ-ray spectra from the decay of the 0.42s (10−) and 0.60s (5+) isomers at 476 keV and 107.4 keV, respectively, have been measured using the He-jet method. The half-lives of the 6+ (278.2 keV, 1.1±0.4 ns), 7+ (224.6 keV, 2.6±0.2 ns) and 8+ (406.8 keV, 2.9±0.4 ns) members of theπd3/2-vi13/2 multiplet have been obtained from the time distributions between cyclotron beam pulses andγ-rays depopulating these levels. A calculation made assuming a pure two-particle configuration for the multiplet predicts very well theB(E2) values for the transi…
Precise pion electroproduction in thep(e, e? ?+)n reaction at W=1125 MeV
1996
The reactione+p →> e+π ++n at c.m. energyW=1125MeV and momentum transfer Q2=0.117GeV2/c2 has been measured. The transverse and longitudinal structure functions have been separated by varying the polarization of the virtual photon (Rosenbluth plot) with a 3 to 4% error. In addition the longitudinal-transverse interference term has been determined measuring the right-left asymmetry with an accuracy of 3%. The experimental data are compared to model calculations, and the sensitivity of the results to the axial and pion formfactors is discussed.
Identification of the 13/2+ isomer in 199At
2000
The 13/2+ isomeric state in the 199At nucleus has been identified at an excitation energy of 573 keV and its half-life measured to be 580(130) ns using the recoil-decay tagging technique.
In-beam study of low-lying levels in the149Sm nucleus
1989
The146Nd(α,n) reaction combined with conventional in-beam spectroscopic methods has been used to study low-lying levels in149Sm. Several new levels andγ-ray transitions have been placed to the149Sm level scheme. Main features of levels below 1 MeV in149Sm have been reproduced in a quasiparticle-rotor model calculation.
Excited states in 31S studied via beta decay of 31Cl
2006
The beta decay of 31Cl has been studied with a silicon detector array and a HPGe detector at the IGISOL facility. Previously controversial proton peaks have been confirmed to belong to 31Cl and a new proton group with an energy of 762(14) keV has been found. Proton captures to this state at 6921(15) keV in 31S can have an effect on the reaction rate of 30P(p,γ) in ONe novae. Gamma rays of 1249.1(14) keV and 2234.5(8) keV corresponding to the de-excitations of the first two excited states in 31S have been measured. No beta-delayed protons from the IAS have been observed. peerReviewed