Positron physics

Positron annihilation is of great interest for applications in evaluating material structures in range from a few angstroms to hundreds of nanometers. Here, we report on a new model for calculating the free volume size in porous materials from the experimental ortho-Positronium (o-Ps) lifetimes reported and updated over than past four decades by the combination of the quantum and semi-classical physics models.

8p vicedric 08-02-2023 3 3   Download

In this article, we calculate QED corrections due to the initial-state photon radiation (ISR) to process e- e+ -> W- W+ -> 4 jets at lepton colliders. The computations are performed up to the correction with order. For physically interpretation, the impact of ISR corrections on total cross sections and its relevant distributions are studied. We find that the corrections are almost 10% of the total cross-section. Thus, these corrections are significant, and they must be taken into account at lepton colliders in the future.

8p 035522894 26-03-2020 45 1   Download

Slow Positron Beam (PB) is an important device in the study of positron physics and techniques, especially in material research. For the purpose of conceptual designing a PB system, we have simulated a PB system with the parameters of an existing system – SPONSOR, using SIMION software.

8p vineptune2711 04-11-2019 9 0   Download

We study the production of Higgs and Z bosons which has been proposed as an option of e+e − collision at the ILC, CLIC with the polarization of the electron and positron beams in Randall-Sundrum model (RSM). The differential cross-sections are presented and numerical evaluation is given. Based on the results, we show that the advantageous direction to collect Higgs is perpendicular to the direction of the initial e− beam. With the high integrated luminosity and at the high degree of polarization, the reaction can give observable cross-sections in future accelerators (ILC, CLIC).

6p thuyliebe 08-10-2018 14 0   Download

(bq) part 2 book “physics for diagnostic radiology” has contents: diagnostic imaging with radioactive materials, positron emission tomographic imaging, radiobiology and generic radiation risks, diagnostic ultrasound, magnetic resonance imaging, multiple choice questions,… and other contents.

339p tieu_vu15 07-09-2018 33 2   Download

According to classical physics the particle cannot be a wave, and the wave cannot be a particle. However, Einstein, while explaining the photoelectric effect (PEE), postulated that electromagnetic radiation has a dual wave-particle nature. He used the term photon to refer to the particle of electromagnetic radiation. He proposed a simple equation to relate the energy of the photon E to the frequency n and wavelength l of electromagnetic wave.

0p hyperion75 18-01-2013 46 6   Download

From the early 1970s to mid-1990s, positron emission tomography (PET) as a diagnostic imaging modality had been for the most part used in experimental research. Clinical PET started only a decade ago. 82Rb-RbCl and 18F-Fluorodeoxyglucose were approved by the U.S. Food and Drug administration in 1989 and 1994, respectively, for clinical PET imaging. Reimbursement by Medicare was approved in 1995 for 82Rb-PET myocardial perfusion imaging and for 18F-FDG PET for various oncologic indications in 1999. Currently several more PET procedures are covered for reimbursement....

219p echbuon 02-11-2012 67 16   Download

In 2003 we published Positron Emission Tomography: Basic Science and Clinical Practice. The aim of that book was to address what we perceived of as a lack, at the time, of a comprehensive contemporary reference work on the rapidly expanding area of positron emission imaging. The scope was intentionally wide. The original proposal for a 350 page book turned into a nearly 900 page volume.

381p gian_anh 18-10-2012 78 3   Download

Essential for students, science and medical graduates who want to understand the basic science of Positron Emission Tomography (PET), this book describes the physics, chemistry, technology and overview of the clinical uses behind the science of PET and the imaging techniques it uses. In recent years, PET has moved from high-end research imaging tool used by the highly specialized to an essential component of clinical evaluation in the clinic, especially in cancer management.

381p famvandao 13-04-2012 133 26   Download