Graduate Seminar, 13th November

Speaker: Adam Cichoński

Title: Internal dosimetry in nuclear medicine treatment.

Abstract: Internal radiotherapy in oncology is therapeutic method of increasing importance. Despite many technical difficulties, possibilities which are given by this method, makes it extremely interesting. One of the most important tasks is prediction amount of radiation dose that patient will receive during treatment. That’s more important than determining the radiation dose that patient receives post factum. There is no reliable model to allow prediction of radiation dose as precisely as it is necessary for radiotherapy.

Graduate Seminar, 6th November

Speaker: Viktor Svensson

Title: Hydrodynamization of kinetic theory

Abstract: In ultrarelativistic heavy-ion collisions, hydrodynamics has been successfully applied to describe the evolution of the quark-gluon plasma. The applicability of hydrodynamics implies a significant reduction in the number of degrees of freedom. We study this reduction for a simple kinetic theory undergoing Bjorken flow.

 

Graduate Seminar, 23rd October

Speaker: Oleksandr Kovalenko

Title: “Chiral magnetic effect in nucleus-nucleus collisions at LHC energies”.

Abstract: The chiral magnetic effect (charge separation in strong magnetic field) is of great importance for QCD studies as it is a direct consequence of parity violation. Main observables and collision parameters that are used in ultra relativistic heavy ion physics will be presented. The most recent results on the Chiral Magnetic Effect in nucleus-nucleus collisions will be reviewed.

Graduate Seminar, 16th October

Speaker: Erik Kofoed

Title: Chiral Perturbation Theory for Neutron-antineutron Oscillations

Abstract: Neutron-antineutron oscillations is a possible consequence of baryon number violating physics. Transition matrix elements for oscillations can be calculated numerically, up to an overall scale, with lattice simulations. Such simulations contain artefacts such as choice of unphysical pion masses and finite volume effects. In order to estimate the impact of these artefacts we compute the matrix element in Chiral Perturbation Theory in both infinite and finite volume and at a variable pion mass.

Graduate Seminar, 9th October

Speaker:  Artem Poliszczuk

Title: Fuzzy support vector machine application to data mining in sky surveys.

Abstract: The first application of the fuzzy support vector machine (FSVM) algorithm as the automated classification tool for astronomical catalogs will be presented. This new approach allows to perform a more trustable classification of astronomical sources by making use of the measurement uncertainties. The performance of different versions of the SVM algorithm is examined on the AKARI-NEP data and the resultant catalog of infrared-selected galaxies is presented.

Graduate Seminar, 30th May

Speaker: Oleg Shkola

Title : Search for charged massive particles with a disappearing track signature at CMS

Abstract: Among different scenarios of the supersymmetry breaking, Anomaly-Mediated SUSY Breaking (AMSB) predicts a small mass splitting between the lightest neutralino and chargino. Then chargino can decay into neutralino  and a low-momentum pion. If chargino decays in a tracker this leads to a disappearing track. In the presentation I will show how in the CMS detector we can reconstruct disappearing tracks. I will also present results as limits on the chargino mass and its mean lifetime for direct electroweak chargino-chargino and chargino-neutralino production.

Graduate Seminar, 23rd May

Speaker: Dobromił Załoga

Title: Research on emission of visible and X-ray radiation, and estimations of electron temperature in discharges of Plasma-Focus type

Abstract: This presentation reports on results of detailed experimental studies of the visible and x-ray emission, as well as estimations of plasma electron temperatures in discharges of the Plasma-Focus (PF) type, particularly in the PF‑1000U facility at IPPLM. In particular there are summarized measurements of the visible radiation from PF discharges, measurements performed by means of laser interferometry, time-integrated measurements of x-rays, as well as time-resolved measurements of soft x‑rays, which were performed by means of framed MCP (Micro-Channel Plate) and “pinhole” cameras equipped with scintillation detectors, as well as by means of a set of 4 semiconductor PIN-type diodes equipped with appropriate absorption filters. It was shown that the formation of different microstructures inside the dense and hot plasma column during PF‑type discharges depends strongly on experimental conditions, and particularly on gas conditions. At the same experimental conditions microstructures in form of plasma-current filaments are relatively well reproducible in the macroscopic scale, but microstructures in form of hot-spots are irreproducible. Due to a stochastic character of the formation of such microstructures, their parameters (i.e. positions, lifetime, density and electron temperature) can differ considerably, e.g. local values of electron temperature Te can change in a range from about 100 eV to about 880 eV.

Graduate seminar, 16th May

Speaker: Michał Palczewski

Title: „Detailed illustration of accuracy of presently used nuclear-mass models”

Abstract: The accuracy of used nuclear – mass models plays important role in nuclear research and is still being developed by different scientific groups. During the seminar I would like to focus more on that topic mentioned in my last talk. Different approaches to this problem give different accuracies but the precision of each model varies in different regions of nuclear chart. This can be represented by simple but very useful and detailed pictures showing the deviations between masses (experimental and theoretical one) for each nucleus. Later these data can be applied in research, e.g. in improvements of known models and in the prediction of values of masses of still unknown isotopes; with the predictive power seen mostly in macro-micro models. However, what should be mentioned, especially with other models, a model predicting well known masses doesn’t have to work well in the prediction of unknown ones, showing the problem of need of using appropriate models in a given area of the research.

Graduate Seminar, 9th May

Speaker: Katarzyna Frankiewicz

Title: The CosmicWatch project

Abstract: CosmichWatch is a simple, physics-motivated machine- and electronics-shop project for university students and schools. Our detector is a self-contained apparatus that employs a plastic scintillator as a detection medium and a silicon photomultiplier for light collection. The detector can be battery powered and used in conjunction with the provided software to make interesting physics measurements.

Venue: Room 22, 9:00 A.M.