samarium

Definitions

  • WordNet 3.6
    • n samarium a grey lustrous metallic element of the rare earth group; is used in special alloys; occurs in monazite and bastnasite
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Webster's Revised Unabridged Dictionary
    • n Samarium (Chem) A rare metallic element of doubtful identity.☞ Samarium was discovered, by means of spectrum analysis, in certain minerals (samarskite cerite, etc.), in which it is associated with other elements of the earthy group. It has been confounded with the doubtful elements decipium philippium, etc., and is possibly a complex mixture of elements not as yet clearly identified. Symbol Sm. Provisional atomic weight 150.2.
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Century Dictionary and Cyclopedia
    • n samarium The name given by Lecoq de Bois-baudran to a metal which he supposed he had discovered in the mineral samarskite by the aid of the spectroscope. Nothing further is known of it, nor has its existence been, as yet, definitely established.
    • n samarium This metal belongs to the cerium group. The oxid is white, the salts yellow, and characteristic absorption and spark spectra have been obtained. Like so many other members of the cerium and yttrium groups, samarium is of uncertain individual identity. There seems now but little doubt that in its oxid as originally described there is present at least one other element, the europium of Demarçay, Urbain, and Lacombe.
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Etymology

Webster's Revised Unabridged Dictionary
NL., fr. E. samar,skite

Usage

In literature:

Samarium, discovery of, 219.
"Woman in Science" by John Augustine Zahm
Samarium discovered by Boisbaudran, Scandium by Nilson, and Thulium by Cleve.
"The Progress of Invention in the Nineteenth Century." by Edward W. Byrn
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In news:

Bunting Magnetics Co. Newton, KS, has expanded its inventory of products available online, including additions to its bonded neodymium, sintered neodymium, samarium cobalt, alnico and ceramic magnet product lines.
The new products consist of additions to the bonded neodymium, sintered neodymium, samarium cobalt, alnico and ceramic magnet product line s.
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In science:

Among the rare-earth elements, Samarium represents a particular case as the orbital and spin contributions to the magnetisation almost cancel out so that the magnetic density map contains both positive and negative regions.
Polarized Neutron Scattering
Measurements of ore samples yielded an abnormally low value for the ratio of two isotopes of Samarium, 149Sm/147Sm.
The Confrontation between General Relativity and Experiment
Roederer derived isotopic fractions of europium, samarium and neodymium in two metal-poor giants with apparently different nucleosynthetic histories, extending the examination of the neutron-capture origin of multiple rareearth elements in metal poor stars to the isotopic level for the first time.
First Stars III Conference Summary
Search for parity nonconserving optical rotation in atomic samarium.
Single barium ion spectroscopy: light shifts, hyperfine structure, and progress on an optical frequency standard and atomic parity violation
The primary parameters are usually not fundamental constants (e.g. the resonance energy of the samarium Er for the Oklo phenomenon, the deuterium binding energy BD for nucleosynthesis etc.) The second step is thus to relate the primary parameters to (a choice of) fundamental constants ci .
Fundamental constants and tests of general relativity - Theoretical and cosmological considerations
The observable O is a set of isotopic ratios that allow to reconstruct the average cross-sections for the nuclear network that involves the various isotopes of the samarium and gadolinium (this involves assumptions about the geometry of the reactor, its temperature that falls into X ).
Fundamental constants and tests of general relativity - Theoretical and cosmological considerations
It was argued (Damour and Dyson, 1996) on the basis of a model of the samarium nuclei that the energy of the resonance is mainly sensitive to α so that the only relevant parameter is dα ∼ −1.1 × 107 .
Fundamental constants and tests of general relativity - Theoretical and cosmological considerations
We apply the shell model Monte Carlo approach to families of even-even samarium and neodymium isotopes and identify a microscopic signature of the crossover from vibrational to rotational collectivity in the low-temperature behavior of hJ2 iT , where J is the total spin and T is the temperature.
Crossover from vibrational to rotational collectivity in heavy nuclei in the shell-model Monte Carlo approach
In the heavier samarium isotopes, the low-temperature response of hJ2 iT becomes increasingly linear, suggesting the presence of stronger rotational collectivity.
Crossover from vibrational to rotational collectivity in heavy nuclei in the shell-model Monte Carlo approach
In Fig. 3 we show the total state densities as a function of the excitation energy Ex for the even-even samarium isotopes (148−154 Sm).
Crossover from vibrational to rotational collectivity in heavy nuclei in the shell-model Monte Carlo approach
The other samarium isotopes shown in Fig. 4 are deformed in their ground state and K exhibits a local minimum above the pairing transitions, which we interpret as the decay of vibrational collectivity.
Crossover from vibrational to rotational collectivity in heavy nuclei in the shell-model Monte Carlo approach
Unfortunately, state-of-theart (RE)BCO coated conductors contain gadolinium (GdBCO) or samarium (SmBCO) having high neutron capture cross-sections.
Stress dependence of the critical currents in neutron irradiated (RE)BCO coated conductors
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