Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 38 for “"Liquid Scintillator"”.
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PURIFICATION AND CHARACTERIZATION OF THE JUNO LIQUID SCINTILLATOR: FIRST RADIOPURITY RESULTS
… carried out within the JUNO experiment, a large liquid scintil- lator experiment devoted to study neutrinos. JUNO (Jiangmen Underground Neutrino Observatory) is the largest organic liquid scintillator detector ever built. It exploits 20000 tons of organic liquid scintillator contained in a huge …
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A Study of the Quenching Properties of Alcohols in Liquid Scintillator Solutions
Electronic Thesis or Dissertation
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Landau energy loss in liquid scintillator and the search for WIFs with the LVD experiment
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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Characterization of water-based liquid scintillator response to gammas and neutrons at varying scintillator-surfactant concentrations
… flux experiments require many tons of bulk liquid organic scintillator to take spectroscopic data of these energetic particles. However, material and chemical concerns make such experiments both challenging and costly. In their work, Winn and Raftery prepose a method of water-based …
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Analysis of the optical coupling of wavelength-shifting fibers to organic liquid scintillator filled fluoropolymer tubes for industrial and nuclear security applications
… steam chamber and minimize costs. The organic liquid scintillator based detection modules also detect fast neutrons. During the initial characterization of an unidentified radioactive source, it is important to have the capability to determine if special nuclear material (SNM) is present and if …
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Development of metal loaded liquid scintillators for future detectors to investigate neutrino properties
… neutrino experiments call for metal loaded liquid scintillators for neutrino detection. The challenge in the development of such scintillators is how to dissolve large amounts of the metal in an organic liquid scintillator without degrading the optical properties. A promising new approach is …
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Reactor Antineutrinos In The Sno+ Water Phase And Detector R&d For Large-Scale Neutrino Detectors
… will need high efficiency PMTs, state-of-the-art liquid scintillator, and new and emerging technology. My work in bench-top characterization of several modern PMTs and liquid scintillator mixtures has been critical for understanding the expected detector response and sensitivty of SNO+, future …
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Measurement of neutron fluence at En=20-100 MeV using a stacked scintillator spectrometer
… work consists of two identical segments of NE213 liquid scintillator, of dimensions 13.0 x 13.0 x 7.0 cm³ The present work demonstrates a new application of a stacked spectrometer which has been developed in the Physics Department of the University of Cape Town. The spectrometer used in the …
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Neutron Measurements and Reactor Antineutrino Search with the SNO+ Detector in the Water Phase
The SNO+ experiment is a large-scale liquid scintillator neutrino experiment with a wide range of physics objectives. SNO+ has adopted a staged approach where the detector was first filled with ultra-pure water before substituting with liquid scintillator and the target isotope $^{130}$Te for …
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Phenomenology of a Low-Energy Neutrino Factory and Related Experiments
… physics reach of this setup with a 100 kiloton liquid argon detector and comparing its performance to that of a 50 kiloton liquid scintillator detector and a 440 kiloton water Cerenkov detector. The liquid argon and liquid scintillator detectors are found to perform best, providing sensitivity …
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Measurement of neutron radiotherapy spectra in a tissue-equivalent phantom
… in the energy range 0 to 63 MeV. An deuterated liquid scintillator (NE230) was used as the neutron spectrometer for these measurements. The pulse height spectra measured using the NE230 scintillator were unfolded to give the neutron spectra. The results show beam hardening with depth into the …
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Measurement of fluence at the D-line fast neutron facility at iThemba LABS
… facility of iThemba LABS, using an NE213 organic liquid scintillator detector and a 238U fission ionisation chamber. Neutron beams were produced by irradiating a 6 mm natural lithium target with pulsed proton beams obtained from the k = 200 separated sector cyclotron. Three incident proton beam …
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A NEW MEASUREMENT OF THE NEUTRON MULTIPLICITY EMITTED IN 252Cf SPONTANEOUS FISSION
… to its segmented design and use of 6Li-loaded liquid scintillator for a neutron capture target. By tracking the neutron capture lifetime from cosmogenic neutrons and a 252Cf neutron source, we suspect the 6Li content of our scintillator changed over time. We look at this evolution and …
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The response of organic scintillators to neutrons of energy 14-63 MeV
… of a 5 cm (diameter) by 5 cm cylindrical NE213 liquid scintillator to neutrons has been measured as a function of neutron energy in the range 15-63 Me V, using time-of-flight to select neutron energy. The response function at each neutron energy was separated into components associated with the …
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Quality Assurance Testing, and Sensitivity Studies for the SNO+ Experment
… The system detects the oxygen contamination of liquid scintillator as an indirect measurement of radon-222 contamination from air exposure during transport. The technique can measure ppm order oxygen contamination with a resolution of ~60ppm. In addition, the impact of non- gaussian tails in the …
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Measuring the ⁷Be Neutrino Flux From the Sun: Calibration of the Borexino Solar Neutrino Detector
… Borexino solar neutrino detector is a real-time liquid scintillator detector designed to measure sub-MeV neutrinos. With its unprecedented level of radio-purity, Borexino is poised to provide the most precise measurements to-date of solar neutrino and geo-antineutrino fluxes. However, in order to …
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Searching for Reactor Antineutrino Flavor Oscillations with the Double Chooz Far Detector
… interacting via Inverse Beta Decay in a Gd-doped liquid scintillator detector, and comparing the observation to an expectation based on a prediction of the emitted reactor flux. The Columbia University neutrino group was instrumental in construction of the Double Chooz Outer Veto, as well as the …
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Measurement of neutrino mixing angle Θ13 in the Daya Bay Reactor Neutrino Experiment
… e^{+} + n$ in 20~tons of Gadolinium-doped liquid scintillator which served as both target and detector. A search for $\bar{\nu}_{e}$ deficits, a process which would manifest a nonzero value of the $\theta_{13}$ mixing angle, was performed. Between December 2011 and Feb 2012, 55 days of data …
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Determination of neutron energy spectra inside a water phantom irradiated by neutrons of energy up to ~ 64 Me V
… based on an NE230 deuterated organic liquid scintillator (25 mm diameter x 25 mm) has been developed for measuring neutron spectra in water. The spectrometer is capable of measuring neutron energies above 5 MeV, set by the electronic threshold. An important feature of the spectrometer …
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Measurements of the Absolute Cross Section of the Three-body Photodisintegration of Helium-3 Between E[gamma] = 11.4 MeV and 14.7 MeV at HIGS
… target were detected with seven 12.7 cm diameter liquid scintillator detectors. Time-of-flight (TOF) and pulse-shape discrimination (PSD) techniques were used to identify neutron events. The absolute differential cross sections for the <super>3</super>He(&gamma, n)pp reaction as a function of …
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