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Nov 1972; 165 p
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Progress Report
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Journal Article
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Phys. Rev., B; v. 5(8); p. 2958-2972
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ALLOYS, ALUMINIUM 27, ALUMINIUM ALLOYS, COUPLING, GADOLINIUM ALLOYS, IMPURITIES, INTERMETALLIC COMPOUNDS, LANTHANUM 139, LANTHANUM ALLOYS, LOW TEMPERATURE, MAGNETISM, MEDIUM TEMPERATURE, NUCLEI, SPIN-LATTICE RELAXATION, STABLE ISOTOPES, TEMPERATURE DEPENDENCE, ULTRALOW TEMPERATURE, VERY LOW TEMPERATURE
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Phys. Rev., B; v. 6(5); p. 1677-1685
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[en] Using our relativistic-configuration-interaction methodology, we report multireference calculations of energy differences and magnetic-dipole and electric-quadrupole hyperfine structure constants of all five levels in the (5d+6s)2 J=2 manifold of singly ionized 139La. The errors in the splittings of the bottom four levels are no more than 0.02 eV, while the separation of the two highest levels has an error of 0.11 eV due to an incomplete description of the correlation in the levels belonging to higher manifolds. The hyperfine-structure constants show strong sensitivity to many-body effects, resulting in striking improvements over the multiconfiguration Dirac-Fock values. Seven of the ten hyperfine constants are accurate within 2--12 %. For the rest of the constants we have identified the primary cause of the errors as an incorrect description of many-body effects in the high-lying levels and have discussed possible remedies
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[en] We report on zero-field nuclear spin-lattice relaxation measurements of 139La in La1.8Sr0.2CuO4-δ in the normal and the superconducting state. Below the superconducting transition temperature Tc the relaxation rate behaves like 1/T1 ∼ exp[-Δ/kT] with activation energy Δ = 11.5 MeV leading to a gap energy of 2Δ = 23 MeV. With Tc = 38 K the ratio 2Δ/kTc = 7.1 is obtained, which is twice as large as the weak-coupling value of 3.5
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Europhysics Letters; CODEN EULEE; v. 5(7); p. 647-650
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Swigon, K.; Michalik, J.; Radwan, M.
Institute of Nuclear Research, Warsaw (Poland)1972
Institute of Nuclear Research, Warsaw (Poland)1972
AbstractAbstract
No abstract available
Original Title
Radioizotopowa metoda badania wymieszania tworzyw sypkich
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Source
1972; 24 p
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Report
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Lamehi Rachti, Mohammad.
Paris-11 Univ., 91 - Orsay (France)1971
Paris-11 Univ., 91 - Orsay (France)1971
AbstractAbstract
No abstract available
Original Title
Contribution a l'etude des etats analogues de 140La
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1971; 51 p; 27 figs.; 35 refs.; These (3e Cycle).
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Report
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Thesis/Dissertation
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AbstractAbstract
[en] A lead target which resonantly scatters the 7.279 MeV line of neutron capture γ rays of iron was used as a source of variable energy γ-radiation. Variation of the angle of the resonantly scattered beam between 600 and 1200 permits an energy variation, ΔE = 275 eV, below the resonant energy. In 139La, a transmission experiment using a 139La absorber has yielded 3 dips in the above angular range. The values of g GAMMA0 of these levels, and the nuclear level spacing in 139La are deduced. (Auth.)
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Abrahams, K.; Stecher-Rasmussen, F.; Van Assche, P. (eds.); p. 481-484; ISBN 9070120011;
; Mar 1975; Reactor Centrum Nederland; Petten, the Netherlands; 2. international symposium on neutron capture gamma ray spectroscopy and related topics; Petten, the Netherlands; 2 Sep 1974

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Book
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Conference
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AbstractAbstract
No abstract available
Original Title
Mesure de la vie moyenne du niveau 3+ a 2412keV du noyau de cerium 140
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Journal Article
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Compt. Rend., Ser. B; v. 274(22); p. 1249-1252
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[en] Optogalvanic laser spectroscopy has been applied to measure the hyperfine structure of 19 spectral lines of La I in the wavelength regions from 570 to 590 nm and 700 to 825 nm. Experimental hyperfine structure constants A and B of the isotope 139La have been measured for 16 levels of odd parity. From those values six magnetic dipole and ten electric quadrupole constants have been determined for the first time. Some disagreements with previously obtained values are discussed
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Source
S0031-8949(07)24999-02; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
Journal
Physica Scripta (Online); ISSN 1402-4896;
; v. 75(4); p. 572-576

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