scholarly journals Multipole Response of Ni and Sn Isotopes and its Momentum Dependence

2021 ◽  
Vol 12 ◽  
pp. 110
Author(s):  
P. Papakonstantinou ◽  
E. Mavrommatis ◽  
J. Wambach ◽  
V. Yu. Ponomarev
Keyword(s):  
Experimental Studies ◽  
Strength Distribution ◽  
Momentum Dependence ◽  
Self Consistent

We have used a self-consistent Skyrme-HF plus Continuum RPA model to study the low-multipole response of stable and neutron/proton-rich Ni and Sn isotopes using suitable Skyrme parametrizations. Experimental studies of these nuclei are being planned at RIKEN. We focus on the momentum dependence of the strength distribution, as it may provide information on the structure of excited nuclear states.

scholarly journals Why do Electrons with “Anomalous Energies” appear in High-Pressure Gas Discharges?

2018 ◽  
Vol 167 ◽  
pp. 01005 ◽  
Author(s):  
Andrey Kozyrev ◽  
Vasily Kozhevnikov ◽  
Natalia Semeniuk
Keyword(s):  
Runaway Electron ◽  
Experimental Studies ◽  
Boltzmann Kinetic Equation ◽  
Travelling Wave ◽  
Runaway Electrons ◽  
Gas Discharges ◽  
High Energies ◽  
Self Consistent ◽  
Discharge Gap ◽  
Maximum Voltage

Experimental studies connected with runaway electron beams generation convincingly shows the existence of electrons with energies above the maximum voltage applied to the discharge gap. Such electrons are also known as electrons with “anomalous energies”. We explain the presence of runaway electrons having so-called “anomalous energies” according to physical kinetics principles, namely, we describe the total ensemble of electrons with the distribution function. Its evolution obeys Boltzmann kinetic equation. The dynamics of self-consistent electromagnetic field is taken into the account by adding complete Maxwell’s equation set to the resulting system of equations. The electrodynamic mechanism of the interaction of electrons with a travelling-wave electric field is analyzed in details. It is responsible for the appearance of electrons with high energies in real discharges.

scholarly journals Effects of frustration and cyclic exchange on the spin-1/2 Heisenberg antiferromagnet within the self-consistent spin-wave theory

2016 ◽  
Vol 30 (02) ◽  
pp. 1550251 ◽  
Author(s):  
Milica S. Rutonjski ◽  
Milica V. Pavkov-Hrvojević ◽  
Maja B. Berović
Keyword(s):  
High Temperature ◽  
Spin Wave ◽  
Experimental Studies ◽  
Interlayer Coupling ◽  
Wave Theory ◽  
Wave Dispersion ◽  
The Self ◽  
Spin Wave Theory ◽  
Self Consistent ◽  
Spin Wave Dispersion

The relevance of the quasi-two-dimensional spin-1/2 frustrated quantum antiferromagnet (AFM) due to its possibility of modeling the high-temperature superconducting parent compounds has resulted in numerous theoretical and experimental studies. This paper presents a detailed research of the influence of the varying exchange interactions on the model magnetic properties within the framework of self-consistent spin-wave theory based on Dyson–Maleev (DM) representation. Beside the nearest neighbor (NN) interaction within the plane, the planar frustration up to the third NNs, cyclic interaction and the interlayer coupling are taken into account. The detailed description of the elementary spin excitations, staggered magnetization, spin-wave velocity renormalization factor and ground state energy is given. The results are compared to the predictions of the linear spin-wave theory and when possible also to the second-order perturbative spin-wave expansion results. Finally, having at our disposal improved experimental results for the in-plane spin-wave dispersion in high-[Formula: see text] copper oxide La2CuO4, the self-consistent spin-wave theory (SCSWT) is applied to that compound in order to correct earlier obtained set of exchange parameters and high-temperature spin-wave dispersion.

scholarly journals Momentum dependent mean-fields of hyperons & antihyperons

2021 ◽  
Vol 252 ◽  
pp. 05006
Author(s):  
Arsenia Chorozidou ◽  
Theodoros Gaitanos
Keyword(s):  
Experimental Studies ◽  
Mean Field ◽  
Nuclear Astrophysics ◽  
Effective Field ◽  
Momentum Dependence ◽  
Chiral Effective Field Theory ◽  
Relativistic Mean Field ◽  
Optical Potentials ◽  
Nuclear Systems ◽  
Mean Fields

The in-medium properties of hyperons and antihyperons are studied with the Non-Linear Derivative (NLD) model and focus is made on the momentum dependence of strangeness optical potentials. The NLD model is based on the Relativistic Mean Field (RMF) approximation to Relativistic Hadrodynamics (RHD) approach of nuclear systems, but it incorporates an explicit momentum dependence of mean-fields. The extension of the NLD model to the baryon and antibaryon octet is based on SU(6) and G-parity arguments. It is demonstrated that with a proper choice of momentum cut-offs, the Λ and Σ optical potentials are consistent with recent studies of the chiral effective field theory(χ -EFT) and optical potentials are consistent with Lattice-QCD calculations, over a wide momentum region. We also present NLD predictions for the in-medium momentum dependence of ∧¯, ∑¯ and Ξ¯ hyperons. This work is important for future experimental studies, like CBM, PANDA at FAIR and is relevant to nuclear astrophysics as well.

scholarly journals Temperature and Density Conditions for Alpha Clustering in Excited Self-Conjugate Nuclei

Symmetry ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1562
Author(s):  
Bernard Borderie ◽  
Adriana Raduta ◽  
Enrico De Filippo ◽  
Elena Geraci ◽  
Nicolas Le Neindre ◽  
...  
Keyword(s):  
Stellar Evolution ◽  
Experimental Studies ◽  
Mean Field ◽  
Saturation Density ◽  
Self Consistent ◽  
Density Values ◽  
Alpha Clustering

Starting from experimental studies on alpha-clustering in excited self-conjugate nuclei (from 16O to 28Si), temperature and density conditions for such a clustering are determined. Measured temperatures have been found in the range of 5.5–6.0 MeV, whereas density values of 0.3–0.4 times the saturation density are deduced, i.e., 0.046 to 0.062 fm−3. Such a density domain is also predicted by constrained self-consistent mean field calculations. These results constitute a benchmark for alpha clustering from self-conjugate nuclei in relation to descriptions of stellar evolution and supernovae.

scholarly journals Asymmetric Velocity Distributions from Halo Density Profiles in the Eddington Approach

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
J. D. Vergados
Keyword(s):  
Angular Momentum ◽  
Simple Model ◽  
Energy Distribution ◽  
Asymmetry Parameter ◽  
Momentum Dependence ◽  
Axially Symmetric ◽  
Density Profiles ◽  
Self Consistent ◽  
Analytic Expressions ◽  
Event Rates

We show how to obtain the energy distributionf(E)in our vicinity starting from WIMP density profiles in a self-consistent way by employing the Eddington approach and adding reasonable angular momentum dependent terms in the expression of the energy. We then show how we can obtain the velocity dispersions and the asymmetry parameterβin terms of the parameters describing the angular momentum dependence. From this expression, forf(E), we proceed to construct an axially symmetric WIMP a velocity distribution, which, for a gravitationally bound system, automatically has a velocity upper bound and is characterized by the same asymmetriyβ. This approach is tested and clarified by constructing analytic expressions in a simple model, with adequate structure. We then show how such velocity distributions can be used in determining the event rates, including modulation, in both the standard and the directional WIMP searches.

scholarly journals ISOSPIN AND MOMENTUM DEPENDENCE OF LIQUID-GAS PHASE TRANSITION IN HOT ASYMMETRIC NUCLEAR MATTER

2008 ◽  
Vol 17 (09) ◽  
pp. 1917-1926 ◽  
Author(s):  
JUN XU ◽  
LIE-WEN CHEN ◽  
BAO-AN LI ◽  
HONG-RU MA
Keyword(s):  
Phase Transition ◽  
Nuclear Matter ◽  
Gas Phase ◽  
Symmetry Energy ◽  
Thermal Model ◽  
Nuclear Interaction ◽  
Momentum Dependence ◽  
Nuclear Symmetry Energy ◽  
Coexistence Region ◽  
Self Consistent

The liquid-gas phase transition in hot neutron-rich nuclear matter is investigated within a self-consistent thermal model using different interactions with or without isospin and/or momentum dependence. The boundary of the phase-coexistence region is shown to be sensitive to the density dependence of the nuclear symmetry energy as well as the isospin and momentum dependence of the nuclear interaction.

The evolution of the Kuiper belt during the formation of the outer planets

1999 ◽  
Vol 173 ◽  
pp. 37-44
Author(s):  
M.D. Melita ◽  
A. Brunini
Keyword(s):  
Kuiper Belt ◽  
Outer Planets ◽  
Self Consistent ◽  
Planetary Bodies ◽  
Mass Depletion

AbstractA self-consistent study of the formation of planetary bodies beyond the orbit of Saturn and the evolution of Kuiper disks is carried out by means of an N-body code where accretion and gravitational encounters are considered. This investigation is focused on the aggregation of massive bodies in the outer planetary region and on the consequences of such process in the corresponding cometary belt. We study the link between the bombardment of massive bodies and mass depletion and eccentricity excitation.

3-D reconstruction and analysis of mammalian mitotic spindle structure

1992 ◽  
Vol 50 (1) ◽  
pp. 578-579
Author(s):  
Kent McDonald ◽  
David Mastronarde ◽  
Rubai Ding ◽  
Eileen O'Toole ◽  
J. Richard McIntosh
Keyword(s):  
Cross Sections ◽  
Mitotic Spindle ◽  
Experimental Studies ◽  
Video Camera ◽  
Three Dimensions ◽  
Mitotic Spindles ◽  
Black And White ◽  
Reconstruction Methods ◽  
Spindle Structure ◽  
Tissue Culture Line

Mammalian spindles are generally large and may contain over a thousand microtubules (MTs). For this reason they are difficult to reconstruct in three dimensions and many researchers have chosen to study the smaller and simpler spindles of lower eukaryotes. Nevertheless, the mammalian spindle is used for many experimental studies and it would be useful to know its detailed structure.We have been using serial cross sections and computer reconstruction methods to analyze MT distributions in mitotic spindles of PtK cells, a mammalian tissue culture line. Images from EM negatives are digtized on a light box by a Dage MTI video camera containing a black and white Saticon tube. The signal is digitized by a Parallax 1280 graphics device in a MicroVax III computer. Microtubules are digitized at a magnification such that each is 10-12 pixels in diameter.

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