762 research outputs found
Deformations and quasiparticle spectra of nuclei in the nobelium region
We have performed self-consistent Skyrme Hartree-Fock-Bogolyubov calculations
for nuclei close to No. Self-consistent deformations, including
as functions of the rotational frequency, were determined for
even-even nuclei Fm, No, and Rf. The
quasiparticle spectra for N=151 isotones and Z=99 isotopes were calculated and
compared with experimental data and the results of Woods-Saxon calculations. We
found that our calculations give high-order deformations similar to those
obtained for the Woods-Saxon potential, and that the experimental quasiparticle
energies are reasonably well reproduced.Comment: 6 pages, 2 figures; ICFN5 conference proceeding
Low-lying states in near-magic odd-odd nuclei and the effective interaction
The iterative quasi-particle-random-phase approximation (QRPA) method we
previously developed to accurately calculate properties of individual nuclear
states is extended so that it can be applied for nuclei with odd numbers of
neutrons and protons. The approach is based on the proton-neutron-QRPA (pnQRPA)
and uses an iterative non-hermitian Arnoldi diagonalization method where the
QRPA matrix does not have to be explicitly calculated and stored. The method is
used to calculate excitation energies of proton-neutron multiplets for several
nuclei. The influence of a pairing interaction in the channel is studied
Fluctuating parts of nuclear ground state correlation energies
Background: Heavy atomic nuclei are often described using the
Hartree-Fock-Bogoliubov (HFB) method. In principle, this approach takes into
account Pauli effects and pairing correlations while other correlation effects
are mimicked through the use of effective density-dependent interactions.
Purpose: Investigate the influence of higher order correlation effects on
nuclear binding energies using Skyrme's effective interaction.
Methods: A cut-off in relative momenta is introduced in order to remove
ultraviolet divergences caused by the zero-range character of the interaction.
Corrections to binding energies are then calculated using the
quasiparticle-random-phase approximation (QRPA) and second order many-body
perturbation theory (MBPT2).
Result: Contributions to the correlation energies are evaluated for several
isotopic chains and an attempt is made to disentangle which parts give rise to
fluctuations that may be difficult to incorporate on the HFB level. The
dependence of the results on the cut-off is also investigated.
Conclusions: The improved interaction allows explicit summations of
perturbation series which is useful for the description of some nuclear
observables. However, refits of the interaction parameters are needed to obtain
more quantitative results
Linear response strength functions with iterative Arnoldi diagonalization
We report on an implementation of a new method to calculate RPA strength
functions with iterative non-hermitian Arnoldi diagonalization method, which
does not explicitly calculate and store the RPA matrix. We discuss the
treatment of spurious modes, numerical stability, and how the method scales as
the used model space is enlarged. We perform the particle-hole RPA benchmark
calculations for double magic nucleus 132Sn and compare the resulting
electromagnetic strength functions against those obtained within the standard
RPA.Comment: 9 RevTeX pages, 11 figures, submitted to Physical Review
Behavioral modelling of GaN RF-power amplifier
Abstract. In this thesis memory effects and nonlinearities of Gallium Nitride (GaN) Doherty power amplifier (PA) were studied for measurement based behavioral modelling purposes. In SoC simulations a PA model is needed to simulate the performance of different linearization algorithms and to optimize the digital pre-distortion (DPD) design to cancel the memory effects of the PA, thus the model needs to be capable of modelling the memory effects sufficiently. Aim was to study if there were any differences in power amplifiers behavior and memory effects between time division duplexing (TDD) and frequency division duplexing (FDD) and what kind of model topologies are needed to model the PA sufficiently.
In this thesis, two PAs were measured in different operation modes. Characterization setup was built, and an equalizer was characterized to remove the frequency selectivity of the test setup to obtain more accurate measurement results. Two signal bandwidths of 20MHz and 100MHz were used to extract data from power amplifier output with FDD and TDD operation. A generalized memory polynomial was fitted to model the PAs and found to be sufficient to model FDD operation. However, with TDD operation generalized memory polynomial model was not as accurate due to complex memory effects such as thermal and trapping memory. Models were also validated by using a digital pre-distorter and compared with measurement results and the models seem to work well and provide adjacent channel power ratio (ACPR) of -53.5dBc on lower channel and -53.3dBc on upper channel with 100MHz signal.GaN RF-tehovahvistimen käyttäytymistason mallinnus. Tiivistelmä. Tässä työssä tutkittiin Galliumnitraatti (GaN) Doherty-tehovahvistimen (PA) muistiilmiöitä ja epälineaarisuutta mittauksiin perustuvaa käyttäytymistason mallinnusta varten. SoC-simuloinneissa tarvitaan PA-mallia erilaisten linearisointialgoritmien suorituskyvyn simuloimiseksi. Erityisesti digitaalisen esisäröttimen (DPD) suunnittelun optimoimiseksi tehovahvistimessa esiintyvän muistin kumoamiseksi mallin on pystyttävä mallintamaan muistia riittävällä tarkkuudella. Työn tavoitteena oli selvittää, onko tehovahvistimien käyttäytymisessä ja muisti-ilmiöissä eroja aika- ja taajuusdupleksoinnin (TDD, FDD) välillä ja millaisia mallitopologioita tarvitaan, jotta tehovahvistinta voidaan mallintaa riittävällä tarkkuudella.
Tässä työssä käytettiin kahta tehovahvistinta eri toimintatilojen mittaamiseen. Työssä rakennettiin mittausympäristö ja lisättiin taajuuskorjain kumoamaan mittausympäristön taajuusselektiivisyyttä. Kahta signaalinkaistanleveyttä 20 MHz:a ja 100 MHz:ä käytettiin datan keräämiseen tehovahvistimen ulostulosta aika- ja taajusjakoista dupleksointia käyttäen. Tehovahvistimen mallintamiseen sovitettiin muistipolynomi, jonka todettiin olevan riittävän tarkka FDD-toiminnan mallintamiseen, mutta TDD-toiminnassa malli ei ollut yhtä tarkka monimutkaisten muisti-ilmiöiden, kuten lämpö- ja elektronien ansoitusmuistin, vuoksi. Mallit validoitiin myös käyttämällä digitaalista esisärötystä ja niitä verrattiin mittaustuloksiin. Mallit näyttävät toimivan hyvin ja tuottavan vierekkäisen kanavan tehosuhteen (ACPR) -53,5dBc alemmalla kanavalla ja -53,3dBc ylemmällä kanavalla 100MHz signaalilla
Giant Monopole Resonances and nuclear incompressibilities studied for the zero-range and separable pairing interactions
Background: Following the 2007 precise measurements of monopole strengths in
tin isotopes, there has been a continuous theoretical effort to obtain a
precise description of the experimental results. Up to now, there is no
satisfactory explanation of why the tin nuclei appear to be significantly
softer than 208Pb.
Purpose: We determine the influence of finite-range and separable pairing
interactions on monopole strength functions in semi-magic nuclei.
Methods: We employ self-consistently the Quasiparticle Random Phase
Approximation on top of spherical Hartree-Fock-Bogolyubov solutions. We use the
Arnoldi method to solve the linear-response problem with pairing.
Results: We found that the difference between centroids of Giant Monopole
Resonances measured in lead and tin (about 1 MeV) always turns out to be
overestimated by about 100%. We also found that the volume incompressibility,
obtained by adjusting the liquid-drop expression to microscopic results, is
significantly larger than the infinite-matter incompressibility.
Conclusions: The zero-range and separable pairing forces cannot induce
modifications of monopole strength functions in tin to match experimental data.Comment: 11 RevTeX pages, 16 figures, 1 table, extended versio
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