21,677 research outputs found
Crystal calorimeters in the next decade
Crystal calorimeter has traditionally played an important
role in precision measurement of electrons and photons in
high energy physics experiments. Recent interest in calorimeter
technology extends its application to measurement of hadrons and
jets with dual readout. Potential application of new generation
scintillating crystals of high density and high light yield, such
as LYSO, in high energy physics experiments is described.
Candidate crystals for the homogeneous hadronic calorimeter
concept are also discussed
Precision Crystal Calorimeters in High Energy Physics: Past, Present and Future
Precision crystal calorimeters traditionally play an important role in high energy physics experiments. In the last two decades, it faces a challenge to maintain its precision in a hostile radiation environment. This paper reviews the performance of crystal calorimeters constructed for high energy physics experiments and the progress achieved in understanding crystal's radiation damage as well as in developing high quality scintillating crystals for particle physics. Potential applications of new generation scintillating crystals of high density and high light yield, such as LSO and LYSO, in particle physics experiments is also discussed
The Next Generation of Crystal Detectors
Heavy crystal scintillators are used widely in HEP experiments for precision
measurements of photons and electrons. Future HEP experiments, however, require
crystal scintillators of more bright, more fast, more radiation hard and less
cost. This paper discusses several R&D directions for the next generation of
crystal detectors for future HEP experiments.Comment: 5 pages, 2 tables, white paper for the 2013 DPF Snowmass Summer Stud
Atomic and magnetic structures of (CuCl)LaNbO and (CuBr)LaNbO: Density functional calculations
The atomic and magnetic structures of (Cu)LaNbO (=Cl and Br)
are investigated using the density-functional calculations. Among several
dozens of examined structures, an orthorhombic distorted structure,
in which the displacement pattern of halogens resembles the model
conjectured previously based on the empirical information is identified as the
most stable one. The displacements of halogens, together with those of Cu
ions, result in the formation of -Cu--Cu- zigzag chains in the two
materials. The nearest-neighbor interaction within the zigzag chains are
determined to be antiferromagnetic (AFM) for (CuCl)LaNbO but
ferromagnetic (FM) for (CuBr)LaNbO. On the other hand, the first two
neighboring interactions between the Cu cations from adjacent chains are found
to be AFM and FM respectively for both compounds. The magnitudes of all these
in-plane exchange couplings in (CuBr)LaNbO are evaluated to be about
three times those in (CuCl)LaNbO. In addition, a sizable AFM
inter-plane interaction is found between the Cu ions separated by two NbO
octahedra. The present study strongly suggests the necessity to go beyond the
square model in order to correctly account for the magnetic property
of (CuLaNbO.Comment: 24 pages, 7 figure
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