94 research outputs found
BENIGN AND MALIGNANT CARDIAC AND MEDIASTINAL MASSES IN CHILDREN
No full textThe authors have summarized their experience of surgical treatment of cardiac and mediastinal neoplasms in 24 pediatric patients who were operated and followed up from 1967 to 2012. Rapid malignization was observed in one third of patients with thymus tumors. The authors conclude that surgery should be done as soon as possible after detection of a neoplasm, despite the absence of clinical signs and symptoms indicative of involvement of chest organs
SURGICAL TREATMENT OF LARGE BENIGN AND MALIGNANT TUMORS OF THE HEART AND MEDIASTINUM IN CHILDREN
No full textSUMMARY. Authors operated on 24 children with tumors of the heart and mediastinum. Analysis of the results showed that a third of patients with tumors of the thymus has had a rapid malignancy. This fact allows to conclude about the necessity of the surgery soon after the detection of tumors, despite the absence of clinical signs of the chest organs lesion
REMOVAL OF RIGHT HEART CHAMBER B-CELL LYMPHOMA AND TRICUSPIDAL VALVE PROSTHETICS IN A HIV-INFECTED PATIENT
No full textPrimary B-cell lymphoma of the heart is a rare tumor. The authors presented a clinical case of a successful surgical treatment of primary right heart lymphoma in a HIV-infected patient. The use of modern diagnostic assessment methods and aggressive surgical strategies help to achieve clinical effect in this patients’ category
GERDA results and the future perspectives for the neutrinoless double beta decay search using76Ge
No full textThe GERmanium Detector Array (GERDA) is a low background experiment at the Laboratori Nazionali del Gran Sasso (LNGS) of INFN designed to search for the rare neutrinoless double beta decay (0 nu beta beta) of Ge-76. In the first phase (Phase I) of the experiment, high purity germanium diodes were operated in a "bare" mode and immersed in liquid argon. The overall background level of 10(-2) cts/(keV . kg . yr) was a factor of ten better than those of its predecessors. No signal was found and a lower limit was set on the half-life for the 0 nu beta beta decay of Ge-76 T-1/2(0 nu) > 2.1 x 10(25) yr (90% CL), while the corresponding median sensitivity was 2.4 x 10(25) yr (90% CL). A second phase (Phase II) started at the end of 2015 after a major upgrade. Thanks to the increased detector mass and performance of the enriched germanium diodes and due to the introduction of liquid argon instrumentation techniques, it was possible to reduce the background down to 10(-3) cts/(keV . kg . yr). After analyzing 23.2 kg . yr of these new data no signal was seen. Combining these with the data from Phase I a stronger half-life limit of the Ge-76 0 nu beta beta decay was obtained: T-1/2(0 nu) > 8.0 x 10(25) yr (90% CL), reaching a sensitivity of 5.8 x 10(25) yr (90% CL). Phase II will continue for the collection of an exposure of 100 kg . yr. If no signal is found by then the GERDA sensitivity will have reached 1.4 x 10(26) yr for setting a 90% CL. limit. After the end of GERDA Phase II, the flagship experiment for the search of 0 nu beta beta decay of Ge-76 will be LEGEND. LEGEND experiment is foreseen to deploy up to 1-ton of Ge-76. After ten years of data taking, it will reach a sensitivity beyond 10(28) yr, and hence fully cover the inverted hierarchy region
decay of into excited states with GERDA phase I
No full textTwo neutrino double beta decay of Ge-76 to excited states of Se-76 has been studied using data from Phase I of the GERDA experiment. An array composed of up to 14 germanium detectors including detectors that have been isotopically enriched in Ge-76 was deployed in liquid argon. The analysis of various possible transitions to excited final states is based on coincidence events between pairs of detectors where a de-excitation gamma ray is detected in one detector and the two electrons in the other. No signal has been observed and an event counting profile likelihood analysis has been used to determine Frequentist 90% C. L. bounds for three transitions: 0(g.s.)(+) - 2(1)(+): T-1/2(2 nu) > 1.6 x 10(23) yr, 0(g.s.)(+) -0(1)(+) : T-1/2(2 nu) > 3.7 x 10(23) yr and 0(g.s.)(+) - 2(2)(+) : T-1/2(2 nu) > 2.3 x 10(23) yr. These bounds are more than two orders of magnitude larger than those reported previously. Bayesian 90% credibility bounds were extracted and used to exclude several models for the 0(g.s.)(+) - 0(1)(+) transition
Limit on the radiative neutrinoless double electron capture of ^{36} Ar from GERDA Phase I
No full textNeutrinoless double electron capture is a process that, if detected, would give evidence of lepton number vio-lation and the Majorana nature of neutrinos. A search for neutrinoless double electron capture of 36Ar has been performed with germanium detectors installed in liquid argon using data from Phase I of the GERmanium Detector Array (Gerda) experiment at the Gran Sasso Laboratory of INFN, Italy. No signalwas observed and an experimental lower limit on the half-life of the radiative neutrinoless double electron capture of Ar-36 was established: T-1/2 > 3.6 x 10(21) years at 90% CI
ХИРУРГИЧЕСКОЕ ЛЕЧЕНИЕ ДОБРОКАЧЕСТВЕННЫХ И ЗЛОКАЧЕСТВЕННЫХ ОПУХОЛЕЙ СЕРДЦА И СРЕДОСТЕНИЯ У ДЕТЕЙ
No full textSUMMARY. Authors operated on 24 children with tumors of the heart and mediastinum. Analysis of the results showed that a third of patients with tumors of the thymus has had a rapid malignancy. This fact allows to conclude about the necessity of the surgery soon after the detection of tumors, despite the absence of clinical signs of the chest organs lesion. РЕЗЮМЕ. Были прооперированы 24 ребенка с новообразованиями сердца и средостения. Анализ полученных результатов показал, что у трети больных с опухолями вилочковой железы отмечается их быстрое озлокачествление. Указанное обстоятельство позволяет прийти к заключению о необходимости выполнения операции вскоре после выявления новообразования, несмотря на отсутствие клинических признаков, свидетельствующих о поражении органов грудной клетки.
Results on decay with emission of two neutrinos or Majorons in from GERDA Phase I
No full textA search for neutrinoless beta beta decay processes accompanied with Majoron emission has been performed using data collected during Phase I of the GERmanium Detector Array (GERDA) experiment at the Laboratori Nazionali del Gran Sasso of INFN (Italy). Processes with spectral indices n = 1, 2, 3, 7 were searched for. No signals were found and lower limits of the order of 10(23) yr on their half-liveswere derived, yielding substantially improved results compared to previous experiments with Ge-76. A new result for the half-life of the neutrino-accompanied beta beta decay of Ge-76 with significantly reduced uncertainties is also given, resulting in T-1/1(2 nu) = (1.926 +/- 0.094) x 10(21) yr
First results of GERDA Phase II and consistency with background models
No full textThe GERDA (GERmanium Detector Array) is an experiment for the search of neutrinoless double beta decay (0v beta) in Ge-76, located at Laboratori Nazionali del Gran Sasso of INFN (Italy). GERDA operates bare high purity germanium detectors submersed in liquid Argon (LAr). Phase II of data-taking started in Dec 2015 and is currently ongoing. In Phase II 35 kg of germanium detectors enriched in Ge-76 including thirty newly produced Broad Energy Germanium (BEGe) detectors is operating to reach an exposure of 100 kg.yr within about 3 years data taking. The design goal of Phase II is to reduce the background by one order of magnitude to get the sensitivity for T-1/2(0v) = O(10(26)) yr. To achieve the necessary background reduction, the setup was complemented with LAr veto. Analysis of the background spectrum of Phase II demonstrates consistency with the background models. Furthermore Ra-226 and Th-232 contamination levels consistent with screening results. In the first Phase II data release we found no hint for a Ov beta beta decay signal and place a limit of this process T-1/2(0v) > 5.3.10(25) yr (90% C.L., sensitivity 4.0.10(25) yr). First results of GERDA Phase II will be presented
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