June 24th, 2020

лошадь, диаграмма, Фейнман

Шикарнейший вводный курс на 160 страниц с задачами!

A Somewhat Random Walk Through Nuclear and Particle Physics: https://arxiv.org/abs/2006.12564
Thomas D. Cohen, Nicholas R. Poniatowski
These notes are an outgrowth of an advanced undergraduate course taught at the University of Maryland, College Park. They are intended as an introduction to various aspects of particle and nuclear physics with an emphasis on the role of symmetry. The basic philosophy is to introduce many of the fundamental ideas in nuclear and particle physics using relatively sophisticated mathematical tools---but to do so in as a simplified a context to explain the underlying ideas. Thus, for example, the Higgs mechanism is discussed in terms of an Abelian Higgs model. The emphasis is largely, but not entirely theoretical in orientation. The goal is for readers to develop an understanding of many of the underlying issues in a relatively sophisticated way.
лошадь, диаграмма, Фейнман

Знакомые все лица: снова об излучении в изогнутых кристаллах на микротроне в Майнце

Investigation on radiation generated by Sub-GeV electrons in ultrashort Si and Ge bent crystals: https://arxiv.org/abs/2006.12853

L. Bandiera, A. Sytov, D. De Salvador, A. Mazzolari, E. Bagli, R. Camattari, S. Carturan, C. Durighello, G. Germogli, V. Guidi, P. Klag, W. Lauth, G. Maggioni, V. Mascagna, M. Prest, M. Romagnoni, M. Soldani, V.V. Tikhomirov, E. Vallazza
We report on the measurements of the spectra of gamma radiation generated by 855 MeV electrons in bent silicon and germanium crystals at MAMI (MAinzer MIkrotron). The crystals were 15 {\mu}m thick along the beam direction to ensure high deflection efficiency. Their (111) crystalline planes were bent by means of a piezo-actuated mechanical holder, which allowed to remotely change the crystal curvature. In such a way it was possible to investigate the radiation emitted under planar channeling and volume reflection as a function of the curvature of the crystalline planes. We show that using volume reflection, one can produce intense gamma radiation with comparable intensity but higher angular acceptance than for channeling. We studied the trade-off between radiation intensity and angular acceptance at different values of the crystal curvature. The measurements of radiation spectra have been carried out for the first time in bent Germanium crystals. In particular, the intensity of radiation in the Ge crystal is higher than in the Si one due to the higher atomic number, which is important for the development of the X-ray and gamma radiation sources based on higher-Z deformed crystals, such as crystalline undulator.
Comments: 9 pages, 6 figures
лошадь, диаграмма, Фейнман

Пример студенческой работы

Applications of 10 MeV Photons and 100 MeV Protons in Radiotherapy: https://arxiv.org/abs/2006.13117
Austin A. Morris
Geant4 software is used to study 10 MeV photon beams and 100 MeV proton beams. Conclusions are drawn as to the advantages and disadvantages of each therapy, with some additional commentary on the secondary effects of radiation damage in treatment.
Comments: 9 pages, 20 figures