Graduate Seminar, 5th November

Speaker: Albin Nilsson

Title: Lorentz Violation and Extra Dimensions with Gravity Probe B

Abstract: The satellite experiment Gravity Probe B uses four gyroscopes to test General Relativity using the gravity well of the Earth through the de Sitter and Lens-Thirring effects. However, the errors from this experiment are quite large, which allows for alternative explanations of the data through modifications of General Relativity. In this talk I will describe the theory and experimental setup of Gravity Probe B, along with its main results. I will then outline how these results could be used to put constraints on some of the Standard Model Extension (SME) parameters, which is an effective field theory framework for Lorentz and CPT violation. Finally, I will describe how this discrepancy between theory and experiment could be attributed to the existence of extra spatial dimensions.

Graduate Seminar, 29th October

Speaker: Michał Palczewski

Title: Shapes and sizes of high-K states in SHN

Abstract: Superheavy elements are highly unstable systems with extremely low production cross sections. As the creation of new ones is very difficult, as a parallel or additional line of  study one could try a search for new, long-lived metastable states of already known nuclei. It is well known that an enhanced stability may result from the K-isomerism phenomenon which is based mainly on the (partial) conservation of the K-quantum number. To do such studies energies are calculated within the microscopic – macroscopic approach with the deformed Woods-Saxon potential. Configurations are fixed by a standard blocking procedure and their energy found by a subsequent minimization over deformations. Results of blocking for 2 quasiparticle states (nn or pp)as well as for 4 quasiparitcle states (nnpp) will be shown. The relationship between electric quadrupole moments in different isotopes will be discussed next. Especially some of specific deformation parameters for No isotopes – which are experimentally studied now via laser technique will be demonstrated during the talk. Finally, predictions for Rf and some of heavier elements as: Sg, Hs, Ds and Cn – will be shown.

Graduate Seminar, 15th October

Speaker: Anatolii Koval

Title: Exploration of thermosphere wave field planetary structure via in-situ satellite measurements

Abstract: The Earth’s atmosphere is in the process of dynamic adaptation and global movements striving to equilibrium. Development of new models requires a generation of much more precise numerical models of geo-space. Plenty of observations and theoretical estimations exposes the importance of atmospheric gravity waves (AGW) in an understanding of energy and impulse balance of a geo-space. Even nowadays giving numerical characteristics of AGW is problematic, since most of the data obtained from distant observations which can not give precise information for this processes. The only source of precise numerical characteristics can be in situ satellite measurements. Last and the most advanced satellite mission measuring required parameters was DE 2. It was operating in the period of 1980-1983 yy. Through digital signal analysis and complex procedure of AGW selection were identified quantitative properties of the planetary structure of a thermosphere wave field.

Graduate seminar, 8th October

Speaker: Paweł Kowalski

Title: Design and optimization of the strip PET scanner based on plastic scintillators

Abstract: The novel whole-body PET system based on plastic scintillators is developed by the J-PET Collaboration. It consists of plastic scintillator strips arranged axially in the form of a cylinder, allowing the cost-effective construction of the total-body PET. In order to determine properties of the scanner prototype and optimize its geometry, advanced computer simulations using the GATE software were performed. The spatial resolution, the sensitivity, the scatter fraction and the noise equivalent count rate were estimated according to the NEMA norm as a function of the length of the tomograph, number of the detection layers, diameter of the tomographic chamber and for various types of the applied readout. Results of simulations of these characteristics will be presented during the talk.

Graduate Seminar, 1st October 2018

Speaker:  Krzysztof Jodłowski

Title: R(D) (R(D*)) anomaly in B(B*)\to D\tau\nu decay vs 1-loop leptonic corrections in MSSM

Abstract: Quotient of branching ratios for different final lepton states – R(D) (R(D*)) – measured by LHCb, Belle and BaBar, deviates from predictions of Standard Model by \sim 2\sigma (4\sigma). One loop corrections in leptonic sector were calculated in Minimal Supersymmetric Standard Model.  Scan over parameter space was done and it was found that MSSM corrections
do not provide significant enhancement of R(D) (R(D*)), contrary to result given in https://arxiv.org/abs/1604.03416. In second part of the talk, brief review of dark matter physics will be given, focusing on work done in BayesFITS group.

Thesis topic: Dose Distribution Analysis and Optimisation for Stereotactic Irradiation with a Linear Accelerator

The objective of this work is to perform verification of dose distributions calculated with a treatment planning system (TPS), which will provide the basis for creation of a comprehensive test of TPS for stereotactic radiotherapy (SRT).
Monte Carlo (MC) techniques should be used to model the accelerator and to calculate the dose distribution in the patient’s body. Calculated photon beam parameters should be compared with the measurements and should be used as input-data for TPS.
For more information please contact Prof. A. Wysocka-Rabin by email addressed to Anna.Wysocka (at) ncbj.gov.pl.

PhD degree scholarship – experimental neutrino physics

Competition opened on: 20 June 2018

Application submission deadline: 30 August 2018

NCBJ is inviting students of physics to apply for 4 year-duration doctoral studies in Warsaw Neutrino Group in the T2K neutrino experiment. Partially scholarship will be covered by funding from OPUS-2016/21/B/ST2/01092 project financed by National Science Center (NCN). The student is expected to complete his/her PhD degree thesis in elementary particle experimental physics during that time.

Graduate Seminar, 4th June

Speaker: Viktor Svensson

Title: Tensor Network techniques for many-body systems

Abstract: In quantum many-body systems of even moderate sizes, Hilbert space is far too large to fit on a computer. This makes numerical calculations a challenge. With the use of tensor networks, certain classes of quantum states can be efficiently represented and computed. In this talk, I will give an introduction to tensor networks and what they are good for.