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AbstractAbstract
[en] A method is provided for selective photoionization of the odd-numbered atomic mass gadolinium isotopes 155 and 157. The selective photoionization is accomplished by circular or linear parallel polarized laser beam energy effecting a three-step photoionization pathway
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24 Feb 1993; 14 Aug 1991; 25 p; ZA PATENT DOCUMENT 92/6048/A/; US PRIORITY 744,748; Available from the Patents Office, Private Bag X400, Pretoria, 0001, South Africa; Priority date: 14 Aug 1991
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Patent
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AbstractAbstract
[en] Using 155Gd Moessbauer spectroscopy down to 27 mK, we show that, in the geometrically frustrated pyrochlore Gd2Sn2O7, the Gd3+ hyperfine levels are populated out of equilibrium. From this, we deduce that the hyperfine field, and the correlated Gd3+ moments which produce this field, continue to fluctuate as T -> 0. With a model of a spin 1/2 system experiencing a magnetic field which reverses randomly in time, we obtain an analytical expression for the steady state probability distribution of the level populations. This distribution is a simple function of the ratio of the nuclear spin relaxation time to the average electronic spin-flip time. In Gd2Sn2O7, we find the two time scales are of the same order of magnitude. We discuss the mechanism giving rise to the nuclear spin relaxation and the influence of the electronic spin fluctuations on the hyperfine specific heat. The corresponding low temperature measurements in Gd2Ti2O7 are presented and discussed. (authors)
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30 refs.
Record Type
Journal Article
Journal
European Physical Journal. B, Condensed Matter Physics; ISSN 1434-6028;
; v. 27(no.3); p. 347-354

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AbstractAbstract
[en] The p- and d-neutron strength functions of 155Gd:Snl=(1.35±0.11)x10-4, Sn2=(1.87±0.40)x10-4, as well as the M1- and E2-radiative strength functions, were determined from the analysis of the primary γ-ray intensities in the 155Gd(n, γ) reaction at En=1.9, 3.5, 45, 59 and 134 keV average neutron energies. The spin splitting effect of the s-neutron strength function Sn0 was investigated. The Sn0 splitting was not observed out of the experimental errors. 15 refs.; 4 figs.; 2 tabs
Original Title
Spaktry γ-luchej iz reaktsii 155Gd(n, γ) i spinovoe rasshcheplenie s-nejtronnoj silovoj funktsii
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Secondary Subject
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Journal Article
Literature Type
Numerical Data
Journal
Country of publication
BARYON REACTIONS, DATA, ENERGY RANGE, ENERGY-LEVEL TRANSITIONS, EVEN-ODD NUCLEI, FUNCTIONS, GADOLINIUM ISOTOPES, HADRON REACTIONS, INFORMATION, INTERMEDIATE MASS NUCLEI, ISOTOPES, KEV RANGE, MULTIPOLE TRANSITIONS, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, NUMERICAL DATA, RARE EARTH NUCLEI, STABLE ISOTOPES, TARGETS
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AbstractAbstract
[en] Although four decades ago it had been conclusively shown that the first excited 02+ state in 15666Dy90 was a pairing isomer, the lessons of this identification has taken a long time to connect with the Nuclear Structure Community. The 02+ states that can be populated significantly with two particle neutron transfer, all have large enough cross-sections to demonstrate that simple monopole pairing in theoretical descriptions will be insufficient. The conclusion that these states cannot be associated with time-dependent β vibrations of the nuclear shape is also supported by their very weak excitation in inelastic scattering processes such as (d,d'). Blocking of the coupling of the single particle neutrons in odd nuclei to the 02+ states near N=90 have shown that a major part of their configurations is a pair of neutrons in the [505]11/2- Nilsson orbit. This high-K orbit is extruded from the h11/2 shell to the Fermi surface by the increasing deformation caused by adding neutrons outside the N=82 core. These data confirm the separation of prolate-prolate and oblate-oblate pairing. At iThemba LABS we have used conventional γ-ray spectroscopy to investigate structures in the pairing gaps of even-even nuclei in the ranges Z=62-70 and N=88-92, in particular to study the systematics of the excited Kπ = 02+2 and 2γ+ positive parity bands. We find that the 02+ bands all have moments-of-inertia that are greater than those of the ground state 01+1 bands, in complete contradiction to the predictions of all Interacting Boson Models (IBM). The larger moments-of-inertia for 02+ bands are consistent with reduced pairing due to the low density of oblate (high-W) orbitals near the Fermi surface. The odd spin members of the γ bands all track the ground state bands while the even spin members can mix with the 01+ and 02+ bands. Indeed the γ bands and 02+ bands cross and interact strongly affecting the signature splittings S(I) observed in the γ bands. The systematic data will be discussed in terms of the Triaxial Projected Shell Model (TPSM) and the 5-Dimensional Collective Model (5-DCM). This document is composed of an abstract and the slides of the presentation. (author)
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IN2P3 - Institut National de Physique Nucleaire et de Physique des Particules, 3 rue Michel Ange, 75794 Paris (France); 1990 p; Nov 2017; p. 118-142; SSNET'17: International conference on shapes and symmetries in nuclei: from experiment to theory; Gif sur Yvette (France); 6-10 Nov 2017; 8 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses
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Miscellaneous
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Conference
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T. Hayakawa; M. Oshima; Y. Hatsukawa; J. Katakura; H. Iimura; M. Matsuda; S. Mitarai; Y.R. Shimizu; S.-I. Ohtsubo; T. Shizuma; M. Sugawara; H. Kusakari
Japan Atomic Energy Research Institute, Tokai, Ibaraki (Japan); Kyushu University, Hakozaki, Fukuoka (Japan); University of Tsukuba, Tsukuba, Ibaraki (Japan); Chiba Institute of Technology, Narashino, Chiba (Japan); Chiba University, Inage-ku, Chiba (Japan). Funding organisation: (US)1999
Japan Atomic Energy Research Institute, Tokai, Ibaraki (Japan); Kyushu University, Hakozaki, Fukuoka (Japan); University of Tsukuba, Tsukuba, Ibaraki (Japan); Chiba Institute of Technology, Narashino, Chiba (Japan); Chiba University, Inage-ku, Chiba (Japan). Funding organisation: (US)1999
AbstractAbstract
[en] 155Gd was produced in the 150Nd(12C,α3n) reaction at 65 MeV. A partial level scheme constructed from γ-γ coincidence measurements is shown, and rotational bands are labeled. The ground-state rotational band in 156Gd is also presented
Primary Subject
Source
31 Dec 1999; 2 p; Experimental Nuclear Physics in Europe - ENPE 99: Facing the Next Millennium; Sevilla (Spain); 21-26 Jun 1999; ISBN 1-56396-907-6;
; ISSN 0094-243X;
; Available from American Institute of Physics, Melville, NY (US)


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Miscellaneous
Literature Type
Conference
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Fink, J.; Ruebenbauer, K.; Schmidt, H.; Czjzek, G.; Berndt, U.; Keller, C.
Progress report of the Teilinstitut Nukleare Festkoerperphysik1975
Progress report of the Teilinstitut Nukleare Festkoerperphysik1975
AbstractAbstract
No abstract available
Source
Pintschovius, L. (ed.); Kernforschungszentrum Karlsruhe (F.R. Germany). Inst. fuer Angewandte Kernphysik; p. 56-57; Nov 1975; 4 refs. Short communication only.
Record Type
Report
Literature Type
Progress Report
Report Number
Country of publication
CHLORIDES, CHLORINE COMPOUNDS, ELEMENTS, EUROPIUM COMPOUNDS, EVEN-ODD NUCLEI, GADOLINIUM ISOTOPES, GAMMA SPECTROMETERS, HALIDES, HALOGEN COMPOUNDS, INTERMEDIATE MASS NUCLEI, ISOTOPES, MEASURING INSTRUMENTS, METALS, NUCLEI, PLATINUM METALS, RARE EARTH COMPOUNDS, RARE EARTH NUCLEI, SPECTROMETERS, STABLE ISOTOPES, SYNTHESIS, TRANSITION ELEMENTS
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Turaev, N.Yu.; Turaev, Z.Yu.; Sagatov, M.A.; Seregin, P.P.; Mardanakulov, T.I.; Abdusamatov, Kh.A.
Termezskij Gosudarstvennyj Univ., Termez (Uzbekistan)1995
Termezskij Gosudarstvennyj Univ., Termez (Uzbekistan)1995
AbstractAbstract
[en] It was shown by means of 155 Gd Moessbauer spectroscopy that the peculiarities in the PrBa2Cu3O7 compound's behaviour could be explained assuming the mutual substitution of the Pr3+ and Ba2+ ions in the mentioned lattice. (author). 8 refs., 1 fig
Original Title
Osobennosti zaryadovogo raspredeleniya v reshetke PrBa2Cu3O7
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Journal Article
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AbstractAbstract
No abstract available
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Source
Conference on experimental nuclear physics in europe: Facing the next millennium; Sevilla (Spain); 21-26 Jun 1999; (c) 1999 American Institute of Physics.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Conference
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AbstractAbstract
[en] The neutron capture cross-sections and the capture -ray spectra of 155Gd and 157Gd were measured at the 3-MeV Pelletron accelerator of the Research Laboratory for Nuclear Reactors at the Tokyo Institute of Technology in the energy range from 10 to 550 keV. Pulsed keV-neutrons were produced from the 7Li(p,n)7Be reaction by bombarding the lithium target with the 1.5-ns bunched proton beam from the Pelletron accelerator. The spectrum for the neutrons incident on a capture sample was measured by means of a time-of-flight method with a 6Li-glass detector. Capture - rays were detected with a large anti-Compton NaI(Tl) spectrometer by employing a time-of-flight method. A pulse-height weighting technique was applied to the observed capture -ray pulse-height spectra to derive the capture yields. The neutron capture cross-sections were determined relative to the standard capture cross-section of 197Au. The results were compared to other measurements and the evaluated values. The capture -ray spectra were obtained by unfolding the observed capture -ray pulse-height spectra.
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Source
21 refs, 8 figs, 4 tabs
Record Type
Journal Article
Journal
Journal of the Korean Physical Society; ISSN 0374-4884;
; v. 50(2); p. 409-416

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AbstractAbstract
[en] The intensities of primary γ transitions in the reaction 155Gd(n,γ) at average neutron energies En=1.9, 3.5, 45, 59, and 134 keV are analyzed with the aim of determining the p- and d-neutron strength functions of 155Gd and the M1 and E2 radiative strength functions. The former are found to be Sn1 = (1.35 ± 0.11) x 10-4 and Sn2 = (1.87 ± 0.40)x10-4. The effect of spin splitting of the s-neutron strength function SnO is studied. No spin splitting of SnO falling beyond experimental errors is found: a=(S+n0 - S-n0)/Sn0=0.16 ± 0.33. 15 refs., 4 figs., 2 tabs
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Source
Translated from Yadernaya Fizika; 58: 1347-1352 No. 8, 1347-1352(1995).
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Translation
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