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AbstractAbstract
[en] The (7/2)[523] and (7/2)[404] bands are observed in 159Tm to I = (61/2) and (43/2), respectively, well beyond the i/sub 13/2/ neutron backbend. Before the backbend, the (7/2)[523] band exhibits large signature splitting, the (7/2)[404] none, which is interpreted as resulting from the very different driving influences of the K = (7/2) h/sub 11/2/, and g/sub 7/2/ orbits, respectively, on the core triaxiality. The i/sub 13/2/ neutron alignment changes the signature splitting in each band as a result of its dominant driving force to positive values of γ. Measured B(M1;I→I-1)/B(E2;I→I-2) values increase dramatically after the backbend, and this is explained in terms of calculated increases in the M1 transition rates and decreases in the E2 rates
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Journal Article
Journal
Physical Review. C, Nuclear Physics; ISSN 0556-2813;
; v. 29(5); p. 1934-1937

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Aguer, P.; Bastin, G.; Liang, C.F.; Libert, J.; Paris, P.; Peghaire, A.
Paris-11 Univ., 91 - Orsay (France). Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse1976
Paris-11 Univ., 91 - Orsay (France). Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse1976
AbstractAbstract
No abstract available
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Source
1976; 1 p; 3. International conference on nuclei far from stability; Cargese, Corsica, France; 19 May 1976; Published in summary form only.
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Report
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AbstractAbstract
No abstract available
Original Title
Isomere und Zustandskonfiguration im uu-Kern 160Tm
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Source
Hohmuth, K. (ed.); Bergakademie Freiberg (German Democratic Republic). Sektion Physik; Friedrich-Schiller-Universitaet, Jena (German Democratic Republic). Sektion Physik; Humboldt-Universitaet, Berlin (German Democratic Republic). Sektion Physik; Karl-Marx-Universitaet, Leipzig (German Democratic Republic). Sektion Physik; Technische Univ., Dresden (German Democratic Republic). Sektion Physik; Zentralinstitut fuer Kernforschung, Rossendorf bei Dresden (German Democratic Republic); p. 53-54; May 1978; p. 53-54; Published in summary form only.
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AbstractAbstract
[en] The spin-lattice relaxation time T1 of 169Tm nuclear spins in TmPO4 has been measured at temperatures T between 50 mK and 2.2 K, in a magnetic field H perpendicular to the c-axis, ranging from 15 mtesla to 5.5 tesla. The results above 0.5 tesla are interpreted in terms of a direct process, strongly slowed down by phonon bottleneck. In very low fields (H < 0.1 tesla), T1 varies like H2/T. We discuss the feasibility of producing a nuclear ordered state of the 169Tm spins by ''brute force''
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Journal Article
Journal
J. Phys. (Les Ulis); v. 46(10); p. 1699-1708
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AbstractAbstract
[en] The multipole mixing ratios for the 198 and 177 keV γ-ray transitions in 169Tm are determined as δ(198)=-6.1-0.6+0.4 and δ(177)=-0.20-0.03+0.04 from new measurements of angular correlation of the 63-198 and 63-177 keV cascades in addition to measurements on the cascades passing through the 118 and 139 keV levels. The present value of δ(198) indicates an almost pure E2 character for the 198 keV γ ray while from earlier measurements an admixture of only 9% E2 was reported for this γ ray. For both the 198 and 177 keV transitions the results do not agree with the conversion electron measurements and indicate that the conversion processes in these transitions are not normal. From time-differential measurement on the 63-198 keV cascade, the relaxation constant λ2=(0.31±0.21)x107 sec-1 is obtained using the source in acetic acid solution. The integral attenuation coefficients for the 316 keV level are found to be G2=0.19±0.04 in liquid chloride source and G2=0.57±0.06 in liquid acetate source
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AbstractAbstract
No abstract available
Original Title
Spin-reshetochnaya relaksatsiya yader paramagnitnykh ionov
Secondary Subject
Source
For English translation see the journal Sov. Phys. - Solid State.
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Journal Article
Journal
Fizika Tverdogo Tela; v. 14(12); p. 3568-3574
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AbstractAbstract
[en] For the first time nuclear Bragg diffraction of synchrotron radiation at the 8.41 keV resonance of 169Tm was observed. Time differential measurements were performed with the pure nuclear (424) reflection of a thulium iron garnet single crystal. The dynamical theory of Moessbauer optics is applied to evaluate the time spectra. The measurements reveal information about the hyperfine fields which has not been accessible before by conventional Moessbauer spectroscopy with polycrystalline samples
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Journal Article
Journal
Europhysics Letters; CODEN EULEE; v. 14(8); p. 821-825
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AbstractAbstract
[en] Clauser and Moessbauer showed that the second order (in perturbation theory) magnetic hyperfine interaction, the so called 'pseudoquadrupole interaction', in the 169Tm Moessbauer effect can produce apparent isomer shifts. While they assumed two isolated singlets and simplified the coupling, the authors show that the second order magnetic hyperfine coupling can be observed in general for any kind of crystalline electric field (CEF) wavefunctions, and that the coupling between many states must often be considered in calculating it. Furthermore since the first order magnetic coupling of the excited CEF states is important, the interaction is best accounted for by diagonalization of the full magnetic hyperfine and CEF Hamiltonian. Examples of the effects that may occur are presented. (Auth.)
Source
6. International conference on hyperfine interactions; Groningen (Netherlands); 4-8 Jul 1983
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Journal Article
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Conference
Journal
Hyperfine Interactions; ISSN 0304-3843;
; v. 16(1-4); p. 1029-1031

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AbstractAbstract
[en] By use of optical hyperfine structure investigations in the Tm I spectrum the A-values of 20 levels of the configurations 4f136s6p and 4f125d6s2 and the A-values of 4f136s22Fsub(5/2) were determined very accurately. (orig./WL)
[de]
Durch Untersuchung der optischen Hyperfeinstruktur im Tm I Spektrum wurden die A-Werte von 20 Niveaus der Konfigurationen 4f136s6p und 4f125d6s2 und der A-Wert von 4f136s22Fsub(5/2) mit grosser Genauigkeit bestimmt. (orig./WL)Primary Subject
Secondary Subject
Source
3 figs.; 4 tabs.; 9 refs.
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Journal Article
Journal
Z. Phys., A; v. 283(4); p. 309-313
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Chebakov, K.; Kolachevsky, N.; Akimov, A.; Tolstikhina, I.; Rodionov, P.; Kanorsky, S.; Sorokin, V.
40th EGAS Conference. Abstracts2008
40th EGAS Conference. Abstracts2008
AbstractAbstract
[en] Full text: It has been shown recently that Yb and Er atoms from the lanthanides group can be efficiently laser-cooled using strong transitions near 400 nm. Degenerate Fermi gases of ytterbium have been also recently demonstrated using laser-cooling based technic. Our goal was to investigate the possibility of laser cooling of Tm atom. Among other lanthanides, thulium possesses relatively simple level structure.Moreover, it has only one stable isotope 169Tm with a nuclear spin of I = 1/2 which makes possible to use schemes for sub-Doppler cooling. Laser-cooled thulium is a favorable candidate for optical clocks applications, since the forbidden transition between the fine structure sublevels (Jg 5=2) - (J'g = 7/2) of the ground state 4f136s2 (λ = 1.14 micron) has a spectral width of approximately 1 Hz. The collisional shift of such kind of transitions in lanthanides is suppressed because of the outer closed 6s2 shell, which allows for precision spectroscopy in a dense atomic cloud. We studied two candidates for cooling transitions from the ground state 4f136s2 (Jg 7/2) to the states 4f12(3H5)5d3/26s2 (Je = 9/2) at 410.6 nm and 4f12(3F4)5d5/26s2 (Je = 9/2) at 420.4 nm. By means of saturation absorption spectroscopy, we measured the hyperfine structure and rates of these transitions. We evaluated the life times of appropriate excited levels as 15.9(8) ns and 48(6) ns, respectively. Decay rates from these levels to neighboring opposite-parity levels were evaluated by means of Hartree-Fock calculations. The fraction of atoms which do not return to the ground state is about 10-5 and 5 · 10-4 for the 410.6 nm and 420.4 nm transitions respectively. We conclude that the strong transition at 410.6 nm with relative slow leakage rate can be used for the efficient cooling of Tm I. We also measured hyperfine structure of two nearby transitions from the ground state to the states 4f13(2F7/2)6s6p(1P1) (Je 5/2) at 409.4 nm and 4f12(3F4)5d5/26s2 (Je = 7/2) at 418.9 nm, which can be used for Λ-type excitation of λ = 1.14 μm transition. (author)
Primary Subject
Source
Windholz, L. (ed.) (Graz University of Technology, Institute of Experimental Physics, Petersgasse 16, A-8010 Graz (Austria)); European Group for Atomic Systems (Germany). Funding organisation: Federal Ministry for Science and Research (Austria); Government of the Province of Styria (Austria); City of Graz (Austria); Graz University of Technology (Austria); Toptica Photonics AG (Germany); Springer Verlag GmbH (Austria); piezosystem jena GmbH (Germany); Coherent (Deutschland) GmbH (Germany); Pfeiffer Vacuum GmbH (Germany); Kurt J. Lesker Company GmbH (United States); Radiant Dyes Laser and Accessories GmbH (Germany); Iseg Spezialelektronik GmbH (Germany); ILMVAC GmbH (Germany); MEWASA FLEX GmbH (Germany); Bernhard Halle Nachfl. GmbH (Germany); 264 p; 2008; p. 83; 40. EGAS Conference 2008; Graz (Austria); 2-5 Jul 2008; Available in abstract form only, full text entered in this record. Available in electronic form from: http://egas2008.tugraz.at/files/BOOK-neu.pdf
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