Beam test of FARICH prototype with digital photon counter Barnyakov, A.Yu; Barnyakov, M.Yu; Bobrovnikov, V.S. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2013, Letnik:
732
Journal Article
Recenzirano
In June 2012 we tested a Focusing Aerogel RICH detector prototype based on Digital Photon Counters (DPC) by Philips at the CERN PS T10 beam line with a particle momentum up to 6GeV/c. The prototype ...comprises a 20×20cm2 photon detector with 48×48 DPC pixels. In order to reduce the dark count rate, the photon detector was cooled to −40°C in addition to disabling individual DPC's microcells. A four layer focusing aerogel radiator with 200mm focal distance was studied. We obtained a Cherenkov angle resolution of 3.61±0.04mrad. The mean number of photoelectrons in a ring is 12. Directly measured π/K separation at 6GeV/c momentum is 3.5σ, μ/π separation is 5.3σ at 1GeV/c. A comparison with a Monte Carlo simulation is presented as well.
•Focusing Aerogel RICH prototype with Digital Photon Counters by Philips was built.•The prototype was tested at the CERN PS T10 beam line.•We observed Cherenkov rings with 12 photoelectrons in average.•Timing resolution of DPCs is 48ps for single photons.•Cherenkov angle resolution is 3.64±0.04mrad per ring.
In diffuse large B-cell lymphoma, bone marrow involvement is rarely diagnosed. We compared the properties of bone marrow stromal progenitor cells and the concentration of fibroblast CFU in patients ...with diffuse large B-cell lymphoma without bone marrow involvement and in healthy donors. It was found that the properties of multipotent mesenchymal stromal cells in patients in the debut of the disease differed considerably from those in healthy donors. In particular, the total cell production in patients was significantly higher than in donors. In multipotent mesenchymal stromal cells of patients, some cell parameters were changes; the mean fluorescence intensity of the adhesion molecule ICAM1 on the cell surface was increased. The mean fluorescence intensity of mesenchymal stromal cell markers (HLA-ABC, CD73 and CD90) was significantly elevated. The relative expression of
BMP4
,
MMP2
,
FGFR1
, and
ICAM1
genes in mesenchymal stromal cell was reduced, while the expression of
FGFR2
gene was enhanced. Despite the absence of proven involvement of the bone marrow, the properties of mesenchymal stromal cells, the components in the stromal microenvironment niche regulating hemopoiesis are altered in patients with diffuse large B-cell lymphoma.
Mediastinal gray-zone lymphoma (MGZL, lymphoma with features intermediate between classical Hodgkin lymphoma and diffuse large B-cell lymphoma) was declared as a separate entity in WHO classification ...of Tumors of Haematopoetic and Lymphoid Tissues in 2008 and 2017 years. Despite of similar pathomorphological characteristics between primary mediastinal B-cell lymphoma and Hodgkin lymphoma, clinical features and optimal therapeutic approach to MGZL are not clearly defined. Usually MGZL manifests with mediastinal lymphadenopathy, although extranodal lesions often occur (grey-zone lymphoma, GZL). Patients with MGZL have unfavorable prognosis, taking into account high rate of relapse. This article describes two cases of MGZL. First case manifested by arrhythmias due to primary heart involvement. In spite of cardiac failure antracycline-containing chemotherapy (6 courses of R-DA-EPOCH) it allowed to achieve a complete remission and resolving of arrhythmias. Second case was represented by metachronous tumors: primary mediastinal B-cell lymphoma at the time of disease onset and classical Hodgkin lymphoma, NS II, diagnosed after disease progression. Thus, we demonstrated two examples of MGZL that differ by clinical manifestation, response to chemotherapy, which emphasizes an importance of pathogenesis studying, and using of new therapeutic approaches.
Search for the decay modes B ± → h ± τ ℓ Grauges, E.; Milanes, D. A.; Schroeder, T. ...
Physical review. D, Particles, fields, gravitation, and cosmology,
07/2012, Letnik:
86, Številka:
1
Journal Article
Recenzirano
Odprti dostop
We present a search for the lepton flavor violating decay modes B+/- to h+/- tau l (h= K,pi; l= e,mu) using the BaBar data sample, which corresponds to 472 million BBbar pairs. The search uses events ...where one B meson is fully reconstructed in one of several hadronic final states. Using the momenta of the reconstructed B, h, and l candidates, we are able to fully determine the tau four-momentum. The resulting tau candidate mass is our main discriminant against combinatorial background. We see no evidence for B+/- to h+/- tau l decays and set a 90% confidence level upper limit on each branching fraction at the level of a few times 10^-5.
The article describes drop-, impact-, and fire tests of a transportation and storage container model during dropping from heights of 9.2 and 1.25 m onto a rigid base and a steel pin, respectively, as ...well as under an impact of the engine simulator of a military jet fighter with a speed of about 215 m/s. Drop tests were additionally performed using a cooled model casing. The main estimated and measured impact parameters are given. Defect detection and post-test check-up results are presented.
North-West side of Forrest-Steppe zone had no high activity in historical events of the beginning of Iron Age, so the material culture of sites of these territories have had no sharp chronological ...rappers. They took places in aristocratic complexes just with appearance of Scythian in Middle Dnieper region. The article deals with two brilliant sites dating to the Early Scythian time — hillford of Khotiv and Perepiatikha burial mound. How is traditional and innovative on these sits divided?
The antiquities of the previous period in Central and Eastern Europe became a conservative feature in the local material culture. This is a way of building and building materials, bi-ritual burial ceremony, hand-made pottery, prestigious personal metal things of the Thracian-Illyrian type, bronze details of a traditional costume, metal and stone tools, stone dishes and crackers.
Innovation is divided into several categories. The first is the technology of fortification, which was appeared in placement of defense from the cavalry, and not only from the archers, and the emergence of new types of arrows — so called Scythian, which in fact became a forced import. In other words, innovation in technology relates to the sphere of warfare. The second category is import. Early imports are associated with the antiquities of the North Caucasus, the Middle East and Asia Minor (Khotiv’s predator, griffins from Perepiatikha, bronze mirrors, geshire and paste beads), which can be called jewelry and toilet items on the whole, that is, luxury items. Late imports connected with Greek policies. These are amphorae — containers of wine or other products, willing fineware and cooking pottery, which in general can be called consumer goods.
Both types of innovation are generally associated with adoption or inventing, as well as getting through trade of new things or technologies that are not associated with the massive migration of carriers of innovation features. At the same time, traditional features show that the ethnic characteristics of the population of the region are not unchanged at the time of being of both sits — hillfort of Khotiv and the funeral complex of Perepiatikha.
We use 429 fb$^{-1}$ of $e^+e^-$ collision data collected at the $\Upsilon(4S)$ resonance with the BABAR detector to measure the radiative transition rate of $b\rightarrow s\gamma$ with a sum of 38 ...exclusive final states. The inclusive branching fraction with a minimum photon energy of 1.9 GeV is found to be $\mathcal{B}(\bar B \rightarrow X_{s}\gamma)=(3.29\pm 0.19\pm 0.48)\times 10^{-4}$ where the first uncertainty is statistical and the second is systematic. We also measure the first and second moments of the photon energy spectrum and extract the best fit values for the heavy-quark parameters, $m_{b}$ and $\mu_{\pi}^{2}$, in the kinetic and shape function models.
Results are presented from calculating the neutron radiation of spent nuclear fuel (SNF) from stationary campaigns of VVER-1000 and VVER-1200 reactors due to spontaneous fission and (α,
n
) ...reactions. An analytical dependence is obtained for the average number of neutrons produced in spent nuclear fuel per α-particle on the particle’s energy. The neutron radiation of VVER-1200 spent nuclear fuel is several times higher than that of a VVER-1000 reactor, due primarily to the increased number of
244
Cm isotopes produced in high-burnup fuel.
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