We report the observation of two-neutrino double-beta decay in (136)Xe with T(1/2) = 2.11 ± 0.04(stat) ± 0.21(syst) × 10(21) yr. This second-order process, predicted by the standard model, has been observed for several nuclei but not for (136)Xe. The observed decay rate provides new input to matrix element calculations and to the search for the more interesting neutrinoless double-beta decay, the most sensitive probe for the existence of Majorana particles and the measurement of the neutrino mass scale.
Several chromatographic procedures were developed by the
authors for the structural
characterization and fractionation of pitches. Six coal tar
pitches obtained by heat treatment
under different conditions, together with a typical mesophase petroleum
pitch, chosen for
comparison, were studied following these procedures. The results
gave an insight into the kind
and extension of the chemical transformation occurring in pitch
structure as a consequence of
heat treatment. A good LC fractionation in compound classes
(confirmed by FT-IR and HPLC
analyses) of the toluene-soluble materials was achieved. The
thermal behavior of the pitches
was studied by thermogravimetric analysis and differential
thermogravimetry, establishing a
correlation between the softening point and the temperature of maximum
weight loss rate. When
toluene-soluble fractions are considered, HPLC and LC results indicate
that the increasing heat
treatment temperature gives rise to a decrease in the content of
unsubstituted planar cata-condensed compounds, with a corresponding increase in the
peri-condensed compounds concentration and a general increase in the condensation degree of polyaromatic
structures. The distillation
of the parent tar, followed to obtain the soft coal tar pitch CTSP,
promotes an extensive removal
of alkyl- and aryl-substituted aromatic compounds which are
subsequently present in small
quantities in all the studied pitches. Petroleum pitch PP consists
of a high proportion of
substituted cata-condensed compounds while coal tar pitch
CTP-2, with similar SP and QI content,
contains peri-condensed compounds and β-resins as its main
components.
EUSO-TA is a on-ground telescope, installed at the Telescope Array (TA) site in Black Rock Mesa, Utah, USA in 2013. The main aim of the project is observation of Ultra High Energy Cosmic Rays (UHECR) through detection of ultraviolet light generated by cosmic-ray showers. EUSO-TA consists of two, 1 m 2 square Fresnel lenses with a field of view of about 10.6 • × 10.6 •. Light is focused on the Photo Detector Module (PDM), identical to the ones that are employed in the other EUSO missions' focal surfaces. The PDM is composed of 36 Hamamatsu multi-anode photomultipliers (64 channels per tube), for a total of 2304 channels. Front-End readout is performed by 36 ASICS, with trigger and readout tasks done by two acquisition boards that send the data to a CPU and storage system. The telescope is housed in a shed located in front of one of the fluorescence detectors of the TA experiment, pointing in the direction of the Electron Light Source and Central Laser Facility. After the installation in February 2013, the performance of the detector has been very good, with little (about one photoelectron) electronic noise and a Point Spread Function of stars compatible with expectations. Several ultra high energy cosmic rays and meteors have been observed. The limiting magnitude of 5.5 on summed frames has been established, with PSF of ∼ 2.5 pixels FWHM. Measurements of the UV background in different darkness conditions and moon phases and positions have been completed. EUSO-TA has been used for development of balloon and space flights within the EUSO framework.
EUSO-Balloon is a pathfinder mission for the Extreme Universe Space Observatory onboard the Japanese Experiment Module (JEM-EUSO). It was launched on the moonless night of the 25 th of August 2014 from Timmins, Canada. The flight ended successfully after maintaining the target altitude of 38 km for five hours. One part of the mission was a 2.5 hour underflight using a helicopter equipped with three UV light sources (LED, xenon flasher and laser) to perform an inflight calibration and examine the detectors capability to measure tracks moving at the speed of light. We describe the helicopter laser system and details of the underflight as well as how the laser tracks were recorded and found in the data. These are the first recorded laser tracks measured from a fluorescence detector looking down on the atmosphere. Finally, we present a first reconstruction of the direction of the laser tracks relative to the detector.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.