Results 51 to 60 of about 144,387 (227)
Universe, 2020 We investigated the effects that occur during the circulation of ultrarelativistic electrons and positrons in the field of an X-ray pulsar. A resonant process in annihilation and the subsequent production of the electron–positron pairs were studied ...
Dmitriy V. Doroshenko +2 more
doaj +1 more source
Detectors in positron emission tomography
Zeitschrift für Medizinische Physik, 2023 Positron emission tomography is a highly sensitive molecular imaging modality, based on the coincident detection of annihilation photons after positron decay.
Artem Zatcepin, Sibylle I. Ziegler
doaj +1 more source
Research advances in metal halides for flexible indirect X‐ray imaging
FlexMat, EarlyView.This review focuses on the preparation of flexible scintillators and provides an in‐depth discussion of the preparation methods and optimization of flexible films and flexible amorphous materials for MHs X‐ray indirect detectors. The content covers characterization methods for flexible materials, the selection of flexible substrates, optimization ...
Tianyu Xie +3 more
wiley +1 more source
Hypervision Proton Surgery: The Future Direction of Proton Therapy
iNew Medicine, EarlyView.ABSTRACT Proton beams provide unique physical advantages characterized by a low entrance dose, negligible exit dose, and a sharp Bragg peak, which enable superior sparing of normal tissues and support safe dose escalation for improved tumor control. However, conventional photon‐based fractionation remains widely used in proton therapy, where prolonged ...
Li Li, Shuanghu Yuan
wiley +1 more source
Positron annihilation in alloys
, 1977 A coherent potential approximation (CPA) treatment of positron annihilation in an alloy is presented. Simple formulae for the spatial and the momentum distributions of the positrons are derived.
K. M. Hong, J. P. Carbotte
core +1 more source
State-selective high-energy excitation of nuclei by resonant positron annihilation
Physics Letters B, 2015 In the annihilation of a positron with a bound atomic electron, the virtual γ photon created may excite the atomic nucleus. We put forward this effect as a spectroscopic tool for an energy-selective excitation of nuclear transitions.
Nikolay A. Belov, Zoltán Harman
doaj +1 more source
UroPrecision, EarlyView.Abstract Background Bladder neck contracture is a challenging complication following radical prostatectomy. While endoscopic management is the first line of treatment, recalcitrant cases often require surgical reconstruction. This report aimed to describe a minimally invasive technique for reconstructing post‐radical prostatectomy vesico‐urethral ...
Amit Hosamani +6 more
wiley +1 more source
Positron annihilation in small molecules
, 2013 Positron annihilation in room temperature samples of the molecular gases N2, O2, CO, N2O and CH4 has been studied in the density range below 10 amagat using the positron lifetime technique.
Dirk van der Werf
core +1 more source
Atomic ionization at annihilation of positrons emitted at β+-decay [PDF]
Ядерна фізика та енергетика, 2011 Atomic ionization at annihilation of positron with another electron of daughter's atom at +-decay is studied. Processes of the different atomic shells ionization at annihilation of positron, emitted at +-decay, with K-electron of daughter's atom are ...
S. N. Fedotkin
doaj
Direct Decay of the Z^0 Boson into Ω_bcc and Ω_bbc Baryons [PDF]
فیزیک کاربردی ایرانElectron-positron annihilation experiments are crucial tools for testing the Standard Model due to the simplicity and clarity of the initial state.
tawfigh Osati
doaj +1 more source