نتایج جستجو برای: positron
تعداد نتایج: 31378 فیلتر نتایج به سال:
Positron annihilation spectroscopy is a powerful probe to investigate the interfaces in materials relevant for energy storage such as Li-ion batteries. The key interpretation of results positron implantation profile, which spatial function related characteristics forming battery. We provide models profile cathode battery coin cell. These are basis reliable visualization multilayer geometries an...
OBJECTIVE To elucidate the radionuclides and radiochemical impurities included in radiosynthesis processes of positron emission tomography (PET) tracers. METHODS Target materials and PET tracers were produced using a cyclotron/synthesis system from Sumitomo Heavy Industry. Positron and γ-ray emitting radionuclides were quantified by measuring radioactivity decay and using the high-purity Ge d...
We investigated sensitivity, specificity, positive predictive value, negative predictive value and accuracy of 18F-fluorodeoxyglucose-positron emission tomography in 170 cases with suspected or biopsy-proven posttransplant lymphoproliferative disorder. All solid organ and hematopoietic stem cell transplant recipients who underwent an 18F-fluorodeoxyglucose-positron emission tomography scan betw...
Recent developments in the design of the Next Linear Collider (NLC) positron source based on updated beam parameters are described. The unpolarized NLC positron source [1,2] consists of a dedicated 6.2 GeV S-band electron accelerator, a high-Z positron production target, a capture system and an L-band positron linac. The 1998 failure of the SLC target, which is currently under investigation, ma...
In this work we study electronic properties of quantum dots relevant to Compton scattering and positron annihilation. The system is modeled by an electron gas confined by a spherical potential of given radius and depth. Electron-electron correlations are not considered in this study. We find that the broadening of the electronic momentum density around a suitably defined Fermi momentum scales w...
context inherited and sporadic medullary thyroid cancer (mtc) is an uncommon and medically challenging malignancy. even if the extent of initial surgery is deemed adequate, the recurrence rate remains high, up to 50% in most series. measurement of serum calcitonin is important in the follow-up of patients with mtc, and reliably reflects the existence of the disease. evidence acquisition there i...
This paper studies the interaction of laser-driven $\ensuremath{\gamma}$ photons and high-energy charged particles with high-Z targets through Monte Carlo simulations. The interacting are taken from particle-in-cell simulations a tightly focused ultra-intense laser pulse titanium target. Lead is chosen as secondary target because its high cross-section giant dipole resonance electron-positron p...
A bstract We study capability of the ILC beam dump experiment to search for new physics, comparing performance electron and positron dumps. The dark photon, axion-like particles, light scalar bosons are considered as physics scenarios, where all important production mechanisms included: electron-positron pair-annihilation, Primakoff process, bremsstrahlung productions. find that has higher sens...
The basic principles of positron annihilation physics are briefly discussed and the three most important experimental techniques used for bulk studies are described (i.e. positron lifetime, angular correlation, Doppler broadening). Several examples of the use of the positron methods are discussed for metals, ceramics and molecular materials, which illustrate the sensitivity of the positron anni...
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