29 research outputs found
First Results from the AMoRE-Pilot neutrinoless double beta decay experiment
The Advanced Molybdenum-based Rare process Experiment (AMoRE) aims to search
for neutrinoless double beta decay (0) of Mo with
100 kg of Mo-enriched molybdenum embedded in cryogenic detectors
with a dual heat and light readout. At the current, pilot stage of the AMoRE
project we employ six calcium molybdate crystals with a total mass of 1.9 kg,
produced from Ca-depleted calcium and Mo-enriched molybdenum
(CaMoO). The simultaneous detection of
heat(phonon) and scintillation (photon) signals is realized with high
resolution metallic magnetic calorimeter sensors that operate at milli-Kelvin
temperatures. This stage of the project is carried out in the Yangyang
underground laboratory at a depth of 700 m. We report first results from the
AMoRE-Pilot search with a 111 kgd live exposure of
CaMoO crystals. No evidence for
decay of Mo is found, and a upper limit is set for the
half-life of 0 of Mo of y at 90% C.L.. This limit corresponds to an effective
Majorana neutrino mass limit in the range eV
Radioassay of the materials for AMoRE-II experiment
The AMoRE-II experiment will search for the 0νββ decay of 100Mo nuclei using molybdate crystal scintillators, operating at milli-Kelvin (mK) temperatures, with a total of 80 kg of 100Mo. The background goal for the experiment is 10–4 counts/keV/kg/year in the region of interest around the 0νββ decay Q-value of 3,034 keV. To achieve this level, the rate of background signals arising from emissions produced by decays of radioactive impurities in the detector and shielding materials must be strictly controlled. To do this, concentrations of such impurities are measured and are controlled through materials selection and purification. In this paper, we describe the design and the construction materials used to build the AMoRE-II detector and shielding system, including active and passive shielding, the cryostat, and the detector holders and instrumentation, and we report on measurements of radioactive impurities within candidate and selected materials
The vernacular sttlement in Central Thailand's water shade: the relationship between human beings and environment in the Thai ways of living
The physical geography of the central region
of Thailand is mostly the alluvium plain
caused by sediment from alluvium. This kind
of plateau is large, but not too high from the
sea level, which is always flooded.
Streams bring humus and cause
sedimentation then fertility for cultivated
area which can be reflected by expression as
'there are fish in the water and there is rice in
the field'. Also, rivers and streams are for
transportation which was one of the main
factors causing linear settlement.
Lifestyles of Thai people have directly related
with water and basins, especially in the
central region. People have been living
compatibly with environment, reflected by
ways of life and local wisdom in the
vernacular architecture comprising distinctive
characteristics including construction
materials, technology, as well as creation of
accommodations which bring about the
unique cultural landscapes.
The study revealed that vernacular
architecture along the water shed in the
central region of Thailand can be categorized
as floating houses, houses on stilt made of
wood, bamboo houses, and shop houses. The
wisdom and knowledge used in the
construction of such vernacular architecture
are not academic, in other words, they do not
follow lessons taught in academic institutes,
but from learning and adaptation of lifestyle
to their surroundings. This then becomes the
local wisdom which can practically be helpful
under each individual ecological system and
local culture
A conservation perspective on the Ba Dinh archaeological site
Abstract not available