نتایج جستجو برای: positron

تعداد نتایج: 31378  

2003
Y. K. Batygin

A proposed NLC polarized positron source utilizes a 150 GeV electron beam passing through a helical undulator. The resulting flux of polarized photons is converted in a thin positron production target. Spin polarized positrons are captured using a high field flux concentrator followed by an accelerator section immersed in a solenoidal field. Positron tracking through the accelerating and focusi...

Journal: :Physical review letters 2013
M Aguilar G Alberti B Alpat A Alvino G Ambrosi K Andeen H Anderhub L Arruda P Azzarello A Bachlechner F Barao B Baret A Barrau L Barrin A Bartoloni L Basara A Basili L Batalha J Bates R Battiston J Bazo R Becker U Becker M Behlmann B Beischer J Berdugo P Berges B Bertucci G Bigongiari A Biland V Bindi S Bizzaglia G Boella W de Boer K Bollweg J Bolmont B Borgia S Borsini M J Boschini G Boudoul M Bourquin P Brun M Buénerd J Burger W Burger F Cadoux X D Cai M Capell D Casadei J Casaus V Cascioli G Castellini I Cernuda F Cervelli M J Chae Y H Chang A I Chen C R Chen H Chen G M Cheng H S Chen L Cheng N Chernoplyiokov A Chikanian E Choumilov V Choutko C H Chung C Clark R Clavero G Coignet V Commichau C Consolandi A Contin C Corti M T Costado Dios B Coste D Crespo Z Cui M Dai C Delgado S Della Torre B Demirkoz P Dennett L Derome S Di Falco X H Diao A Diago L Djambazov C Díaz P von Doetinchem W J Du J M Dubois R Duperay M Duranti D D'Urso A Egorov A Eline F J Eppling T Eronen J van Es H Esser A Falvard E Fiandrini A Fiasson E Finch P Fisher K Flood R Foglio M Fohey S Fopp N Fouque Y Galaktionov M Gallilee L Gallin-Martel G Gallucci B García J García R García-López L García-Tabares C Gargiulo H Gast I Gebauer S Gentile M Gervasi W Gillard F Giovacchini L Girard P Goglov J Gong C Goy-Henningsen D Grandi M Graziani A Grechko A Gross I Guerri C de la Guía K H Guo M Habiby S Haino F Hauler Z H He M Heil J Heilig R Hermel H Hofer Z C Huang W Hungerford M Incagli M Ionica A Jacholkowska W Y Jang H Jinchi M Jongmanns L Journet L Jungermann W Karpinski G N Kim K S Kim Th Kirn R Kossakowski A Koulemzine O Kounina A Kounine V Koutsenko M S Krafczyk E Laudi G Laurenti C Lauritzen A Lebedev M W Lee S C Lee C Leluc H León Vargas V Lepareur J Q Li Q Li T X Li W Li Z H Li P Lipari C H Lin D Liu H Liu T Lomtadze Y S Lu S Lucidi K Lübelsmeyer J Z Luo W Lustermann S Lv J Madsen R Majka A Malinin C Mañá J Marín T Martin G Martínez F Masciocchi N Masi D Maurin A McInturff P McIntyre A Menchaca-Rocha Q Meng M Menichelli I Mereu M Millinger D C Mo M Molina P Mott A Mujunen S Natale P Nemeth J Q Ni N Nikonov F Nozzoli P Nunes A Obermeier S Oh A Oliva F Palmonari C Palomares M Paniccia A Papi W H Park M Pauluzzi F Pauss A Pauw E Pedreschi S Pensotti R Pereira E Perrin G Pessina G Pierschel F Pilo A Piluso C Pizzolotto V Plyaskin J Pochon M Pohl V Poireau S Porter J Pouxe A Putze L Quadrani X N Qi P G Rancoita D Rapin Z L Ren J S Ricol E Riihonen I Rodríguez U Roeser S Rosier-Lees L Rossi A Rozhkov D Rozza A Sabellek R Sagdeev J Sandweiss B Santos P Saouter M Sarchioni S Schael D Schinzel M Schmanau G Schwering A Schulz von Dratzig G Scolieri E S Seo B S Shan J Y Shi Y M Shi T Siedenburg R Siedling D Son F Spada F Spinella M Steuer K Stiff W Sun W H Sun X H Sun M Tacconi C P Tang X W Tang Z C Tang L Tao J Tassan-Viol Samuel C C Ting S M Ting C Titus N Tomassetti F Toral J Torsti J R Tsai J C Tutt J Ulbricht T Urban V Vagelli E Valente C Vannini E Valtonen M Vargas Trevino S Vaurynovich M Vecchi M Vergain B Verlaat C Vescovi J P Vialle G Viertel G Volpini D Wang N H Wang Q L Wang R S Wang X Wang Z X Wang W Wallraff Z L Weng M Willenbrock M Wlochal H Wu K Y Wu Z S Wu W J Xiao S Xie R Q Xiong G M Xin N S Xu W Xu Q Yan J Yang M Yang Q H Ye H Yi Y J Yu Z Q Yu S Zeissler J G Zhang Z Zhang M M Zhang Z M Zheng H L Zhuang V Zhukov A Zichichi P Zuccon C Zurbach

A precision measurement by the Alpha Magnetic Spectrometer on the International Space Station of the positron fraction in primary cosmic rays in the energy range from 0.5 to 350 GeV based on 6.8 × 10(6) positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to ∼ 250  GeV, but, from 20 to 250 GeV, the slope decreases by an...

Journal: :Nuclear medicine and biology 2006
Ananya Ruangma Bing Bai Jason S Lewis Xiankai Sun Michael J Welch Richard Leahy Richard Laforest

BACKGROUND One of the limiting factors in achieving the best spatial resolution in positron emission tomography (PET), especially in small-animal PET, is the positron range associated with the decay of nuclides, and usual PET image reconstruction algorithms do not provide a correction for the positron range. This work presents initial results obtained with the maximum a posteriori (MAP) algorit...

Journal: :Physical review. B, Condensed matter 1996
Barbiellini Puska Korhonen Harju Torsti Nieminen

The generalized gradient correction method for positron-electron correlation effects in solids @B. Barbiellini et al., Phys. Rev. B 51, 7341 ~1995!# is applied in several test cases. The positron lifetime, energetics, and momentum distribution of the annihilating electron-positron pairs are considered. The comparison with experiments shows systematic improvement in the predictive power of the t...

Journal: :Physical review letters 2013
A C L Jones J R Danielson M R Natisin C M Surko

Vibrational Feshbach resonances are dominant features of positron annihilation for incident positron energies in the range of the molecular vibrations. Studies in relatively small molecules are described that elucidate the role of intramolecular vibrational energy redistribution into near-resonant multimode states, and the subsequent coupling of these modes to the positron continuum, in suppres...

Journal: :iranian journal of nuclear medicine 2004
amir reza jalilian mohammad mirzaie pezhman rowshanfarzad mohammad reza ensaf alireza karimian

[18f]kf, considered as a reference standard for positron emission tomography of the skeletal system, was produced by the bombardment of enriched water ([18o]h2o>95%) with high energy protons in nrcam cyclotron. after the extraction of fluoride from enriched water as kf, and passing it through microbial filter and fine adjustment of acidity and osmolality, it was converted into an injectable for...

Journal: :asia oceania journal of nuclear medicine and biology 0
yangchun chen department of nuclear medicine, quanzhou first hospital, fujian medical university, quanzhou, china xiangrong chen department of radiology, quanzhou first hospital, fujian medical university, quanzhou, china ji-an liu guangdong provincial key laboratory of micro-nano manufacturing technology and equipment, guangdong university of technology, guangzhou, china fanyong li the pet-ct center, first affiliated hospital of guangzhou medical university, guangzhou, china

objective(s): considering the fact that the standardized uptake value (suv) of a normal lung tissue is expressed as x±sd, x+3×sd could be considered as the threshold value to outline the internal tumor volume (itv) of a lung neoplasm. methods: three hollow models were filled with 55.0 kbq/ml fluorine18- fluorodeoxyglucose (18f-fdg) to represent tumors. the models were fixed to a barrel filled w...

Journal: :nephro-urology monthly 0
prathamesh joshi department of nuclear medicine and pet-ct,jksookhosy}umlaondrwwwesskhcgo~vwe, worli, india +98-912266573244, [email protected]; department of nuclear medicine and pet-ct,jksookhosy}umlaondrwwwesskhcgo~vwe, worli, india +98-912266573244, [email protected] vikram lele department of nuclear medicine and pet-ct,jksookhosy}umlaondrwwwesskhcgo~vwe, worli, india +98-912266573244, [email protected]

we report a case of prostatic adenocarcinoma, initially presenting with generalized lymphadenopathy, and mimicking lymphoma on flurodeoxyglucose positron emission tomography/computed tomography (fdg pet/ct). our case suggests that in elderly men presenting with generalized lymphadenopathy, the diagnosis of metastatic prostatic carcinoma should not be overlooked even in the absence of typical ur...

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