| 1. |
- Adcox, K, et al.
(författare)
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PHENIX detector overview
- 2003
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - 0167-5087. ; 499:2-3, s. 469-479
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Tidskriftsartikel (refereegranskat)abstract
- The PHENIX detector is designed to perform a broad study of A-A, p-A, and p-p collisions to investigate nuclear matter under extreme conditions. A wide variety of probes, sensitive to all timescales, are used to study systematic variations with species and energy as well as to measure the spin structure of the nucleon. Designing for the needs of the heavy-ion and polarized-proton programs has produced a detector with unparalleled capabilities. PHENIX measures electron and muon pairs, photons, and hadrons with excellent energy and momentum resolution. The detector consists of a large number of subsystems that are discussed in other papers in this volume. The overall design parameters of the detector are presented. (C) 2002 Elsevier Science B.V. All rights reserved.
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| 2. |
- Sohler, D, et al.
(författare)
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Maximally aligned states in Ag-99
- 2003
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Ingår i: European Physical Journal A. Hadrons and Nuclei. - : Springer Science and Business Media LLC. - 1434-6001 .- 1434-601X. ; 16:2, s. 171-175
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Tidskriftsartikel (refereegranskat)abstract
- Excited states of Ag-99 were populated via the Cr-50 + Ni-58 (261 MeV) reaction using the NORDBALL detector array equipped with charged-particle and neutron. detector systems for reaction channel separation. On the basis of the measured gammagamma-coincidence relations and angular distribution ratios a significantly extended level scheme has been constructed up to E-x similar to 7.8 MeV and I = 35/2. The experimental results were described within the framework of the shell model. Candidates for states fully aligned in the pig(9/2)(-3)nu(d(5/2),g(7/2))(2) valence configuration space were found at 4109 and 6265 keV.
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| 3. |
- Spentchian, M, et al.
(författare)
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Severe hypophosphatasia: Characterization of fifteen novel mutations in the ALPL gene
- 2003
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Ingår i: Human Mutation. - : Hindawi Limited. - 1059-7794. ; 22:1, s. 105-106
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Tidskriftsartikel (refereegranskat)abstract
- Hypophosphatasia is an inherited disorder characterized by defective bone mineralization and deficiency of serum and tissue liver/bone/kidney alkaline phosphatase (L/B/K ALP) activity. We report the characterization of ALPL gene mutations in a series of 11 families from various origins affected by perinatal and infantile hypophosphatasia. Sixteen distinct mutations were found, fifteen of them not previously reported: M45V, G46R, 388-391delGTAA, 389delT, T131I, G145S, D172E, 662delG, G203A, R255L, 876-881delAGGGGA, 962delG, E294K, E435K, and A451T. This confirms that severe hypophosphatasia is due to a large spectrum of mutations in Caucasian populations.
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| 4. |
- Vanderah, T A, et al.
(författare)
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Subsolidus phase equilibria and crystal chemistry in the system BaO-TiO2-Ta2O5.
- 2003
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Ingår i: Solid State Sciences. - 1873-3085. ; 5:1, s. 149-164
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Tidskriftsartikel (refereegranskat)abstract
- Subsolidus phase relations have been determined for the BaO:TiO2:Ta2O5 system by X-ray diffraction analysis of ~100 specimens prepared in air at temperatures near but below the solidus (1275 °C to 1500 °C). For the BaO:Ta2O5 subsystem, the formation of all three polymorphs of BaTa2O6 (orthorhombic, tetragonal, and hexagonal) was confirmed. The present study found no stable phases forming between Ba5Ta4O15 and BaO. In the ternary system, along the line BaTiO3–Ba5Ta4O15, the previously reported 8L and 10L hexagonal perovskite derivatives were confirmed, albeit with somewhat wider homogeneity ranges; BaTiO3 dissolves Ta5+ up to BaTi0.64Ta0.29O3, which contains 7% B-cation vacancies and exhibits a dilated cubic unit cell (a=4.0505(2) Å). The formation of Ba3Ti4Ta4O21, a member of the hexagonal A3M8O21-type ternary oxides, was confirmed as well as its solid solution, for which a different mechanism of formation is suggested. Several new compounds have been found, including four members of the orthorhombic (space group Cmcm) "rutile-slab" homologous series, BaTinTa4O11+2n, with n-values 3,5,7,9; the unit cells for these compounds are given. Three ternary phases with close-packed [Ba,O] layer structures related to that of 6L Ba4Ti13O30 were found: 13L Ba18Ti53Ta2O129, 7L Ba10Ti27Ta2O69, and 8L Ba6Ti14Ta2O39. The crystal structures of the 13L and 7L phases were determined by single-crystal X-ray diffraction (13L Ba18Ti53Ta2O129: cchcchcchcchc, C2/m, a=9.859(2) Å, b=17.067(5) Å, c=30.618(8) Å, =96.11(2)°, Z=2; 7L Ba10Ti27Ta2O69: cchcchc, C2/m, a=9.855(3) Å, b=17.081(7) Å, c=16.719(7) Å, =101.18(3)°; Z=2), and are described and compared with those of the 6L and 8L members of this family. Phases with tetragonal tungsten bronze (TTB) related structures occur over large compositional ranges in the BaO:TiO2:Ta2O5 system, both within the ternary (Ba6−xTi2−2xTa8+2xO30, x=0→0.723), and along the BaO–Ta2O5 binary (from 43 to 26 mol% BaO), which in turn dissolves up to ~12 mol% TiO2 to form extensive single-phase fields with different TTB superstructures. X-ray powder diffraction data are given for three binary BaO:Ta2O5 compounds exhibiting the TTB structure and two superstructures. The large compositional ranges of the TTB-type phases are accompanied by only small changes in specific volume. The TTB-type regions within the ternary and those emanating from the BaO–Ta2O5 binary do not co-exist in equilibrium, which likely reflects fundamental differences in the structural mechanisms that accommodate the variable stoichiometries. The similarities and differences between the BaO:TiO2:Ta2O5 and BaO:TiO2:Nb2O5 systems are described.
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