Browsing by Issue Date, starting with "2017-12-28"
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- Selective internal radiation therapy: review of the standard operating procedure for selective internal radiation therapy using SIR-Spheres microspheres labelled with Yttrium 90Publication . Catarino, Ana Rita; Abrunhosa, AnteroAim: Selective Internal Radiation Therapy (SIRT), also known as radioembolization, is a liver-directed therapy for inoperable primary and secondary liver tumours. The aim of this study is to review the Standard Operating Procedure (SOP) used in the Radiopharmacy Department of the Oxford University Hospital NHS Foundation Trust to prepare 90Y labelled SIR-Spheres microspheres, in order to improve the dispensing procedure for delivering the intended patient treatment doses. The specification is: the activity prescribed ±10%. Methods: Eleven tests were carried out according to the current SOP. Radioactivity was diluted in up to 3 or 5 ml of water for injection and inserted into a V-vial. Following this, the used syringes and needles were measured using a Capintec Radionuclide Calibrator to check for any remaining activity. Results: One of the doses dispensed (11th) was below the specification. This, is in, turn triggered the review of the SOP. The operator must dilute the dose up to 3 ml with water for injection and inject it in the V-vial. According to the new procedure, using the same syringe and needle the operator must draw up an additional 1 ml of water for injection and inject this volume again into the V-vial. This washes the syringe and needle and removes any remaining activity. Conclusions: The reviewed SOP to prepare 90Y labelled SIR-spheres microspheres has shown to improve the dispensing procedure in terms of dose delivered to the patient. The collected data has been accepted and the reviewed SOP implemented in the Radiopharmacy Department at Oxford University Hospitals NHS Foundation Trust.
- Search for supersymmetry in events with at least one photon, missing transverse momentum, and large transverse event activity in proton-proton collisions at $ \sqrt{s}=13 $ TeVPublication . CMS collaboration (2231 authors); Nayak, Aruna; Bargassa, Pedrame; Beirão Da Cruz E Silva, Cristóvão; Calpas, Betty; Di Francesco, Agostino; Faccioli, Pietro; Gallinaro, Michele; Hollar, Jonathan; Leonardo, Nuno; Lloret Iglesias, Lara; Seixas, Joao; Toldaiev, Oleksii; Vadruccio, Daniele; Varela, Joao; Vischia, Pietro; David Tinoco Mendes, Andre; Silva, Pedro; Musella, PasqualeA search for physics beyond the standard model in final states with at least one photon, large transverse momentum imbalance, and large total transverse event activity is presented. Such topologies can be produced in gauge-mediated supersymmetry models in which pair-produced gluinos or squarks decay to photons and gravitinos via short-lived neutralinos. The data sample corresponds to an integrated luminosity of 35.9 fb$^{−1}$ of proton-proton collisions at $ \sqrt{s}=13 $ TeV recorded by the CMS experiment at the LHC in 2016. No significant excess of events above the expected standard model background is observed. The data are interpreted in simplified models of gluino and squark pair production, in which gluinos or squarks decay via neutralinos to photons. Gluino masses of up to 1.50-2.00 TeV and squark masses up to 1.30-1.65 TeV are excluded at 95% confidence level, depending on the neutralino mass and branching fraction.
- Femtoscopy with identified charged pions in proton-lead collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with ATLASPublication . ATLAS collaboration (2847 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Araque, Juan Pedro; Carvalho, João; Castro, Nuno Filipe; Conde Muiño, Patricia; Da Cunha Sargedas De Sousa, Mario Jose; Fiolhais, Miguel; Galhardo, Bruno; Gomes, Agostinho; Gonçalo, Ricardo; Jorge, Pedro; Machado Miguens, Joana; Maio, Amélia; Maneira, José; Oleiro Seabra, Luis Filipe; Onofre, António; Pedro, Rute; Santos, Helena; Saraiva, João; Silva, José; Tavares Delgado, Ademar; Veloso, Filipe; Wolters, HelmutBose-Einstein correlations between identified charged pions are measured for p+Pb collisions at sNN=5.02TeV using data recorded by the ATLAS detector at the CERN Large Hadron Collider corresponding to a total integrated luminosity of 28nb−1. Pions are identified using ionization energy loss measured in the pixel detector. Two-particle correlation functions and the extracted source radii are presented as a function of collision centrality as well as the average transverse momentum (kT) and rapidity (yππ★) of the pair. Pairs are selected with a rapidity −2
- Ultralow energy calibration of LUX detector using $^{127}$Xe electron capturePublication . LUX collaboration (93 authors); Brás, P.; Lindote, A.; Lopes, M.I.; Neves, F.; Silva, C.; Solovov, V.N.We report an absolute calibration of the ionization yields (Qy) and fluctuations for electronic recoil events in liquid xenon at discrete energies between 186 eV and 33.2 keV. The average electric field applied across the liquid xenon target is 180 V/cm. The data are obtained using low energy Xe127 electron capture decay events from the 95.0-day first run from LUX (WS2013) in search of weakly interacting massive particles. The sequence of gamma-ray and x-ray cascades associated with I127 deexcitations produces clearly identified two-vertex events in the LUX detector. We observe the K-(binding energy, 33.2 keV), L-(5.2 keV), M-(1.1 keV), and N-(186 eV) shell cascade events and verify that the relative ratio of observed events for each shell agrees with calculations. The N-shell cascade analysis includes single extracted electron (SE) events and represents the lowest-energy electronic recoil in situ measurements that have been explored in liquid xenon.