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AbstractAbstract
[en] The critical field strength is calculated at which the barrier disappears for an electron located in the field of a coulomb center and characterized by prescribed parabolic quantum numbers. The highly excited atoms lifetime in dependence on the field strength deviation from the critical value are obtained. The decay dynamics of highly excited atoms on passage of a beam of highly excited atoms through an electric field is investigated. The experimental data on ionization of highly excited atoms in an electric field are analyzed
[ru]
Original Title
Raspad vysokovozbuzhdennykh atomov v ehlektricheskom pole
Primary Subject
Source
For English translation see the journal Soviet Physics - JETP (USA).
Record Type
Journal Article
Journal
Zhurnal Ehksperimental'noj i Teoreticheskoj Fiziki; ISSN 0044-4510;
; v. 80(5); p. 1715-1726

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Pautrat, M.; Lagrange, J.M.; Dionisio, J.S.; Vieu, Ch.
Paris-11 Univ., 91 - Orsay (France). Inst. de Physique Nucleaire1999
Paris-11 Univ., 91 - Orsay (France). Inst. de Physique Nucleaire1999
AbstractAbstract
[en] The properties of 176Lu as a cosmos-chronometer and a cosmos-thermometer have been studied by the Coulomb excitation technique combined with the recoil method. As expected, the results show that this isotope can not be a reliable cosmos-chronometer. Furthermore it seems that its synthesis occurs for temperatures between 2.35 and 3.6 108 K. The identification of the excitation levels is not easy because of their weak transition probability
Original Title
Proprietes de l'isotope 176Lu comme cosmothermometre
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Source
1999; 27 p; 26 refs.
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Report
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Country of publication
BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CROSS SECTIONS, ENERGY LEVELS, ENERGY-LEVEL TRANSITIONS, EXCITATION, HOURS LIVING RADIOISOTOPES, INTERMEDIATE MASS NUCLEI, INTERNAL CONVERSION RADIOISOTOPES, ISOTOPES, LUTETIUM ISOTOPES, NUCLEI, ODD-ODD NUCLEI, RADIOISOTOPES, RARE EARTH NUCLEI, YEARS LIVING RADIOISOTOPES
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Melamed, N.T.
Westinghouse Electric Corp., Pittsburgh, PA (USA)1979
Westinghouse Electric Corp., Pittsburgh, PA (USA)1979
AbstractAbstract
[en] A method is described for selectively exciting and separating a selected isotope from a mixture of isotopes particularly useful in separation of isotopes of uranium and other heavy metals, including placing the mixture of isotopes in an excited gaseous state, selectively de-exciting, by means of stimulated emission, one or more isotopes of the mixture leaving the selected isotope in the excited state, and subsequently permanently separating the de-excited and excited isotopes. (author)
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Source
5 Sep 1979; 9 p; GB PATENT DOCUMENT 2015240/A/
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Patent
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AbstractAbstract
[en] Inelastic, charge-exchange and transfer reactions induced by hadronic probes at intermediate energies have revealed a rich spectrum of new high-lying modes embedded in the nuclear continuum. The investigation of their decay properties is believed to be a severe test of their microscopic structure as predicted by nuclear models. In addition the degree of damping of these simple modes in the nuclear continuum can be obtained by means of the measured branching ratios to the various decay channels as compared to statistical model calculations. As illustrative examples the decay modes of high-spin single-particle states and isovector resonances will be discussed. (author). 23 refs., 14 figs
Primary Subject
Source
Fernandez Niello, J.O.; Szybisz, L. (Comision Nacional de Energia Atomica, Buenos Aires (Argentina). Dept. de Fisica) (eds.); Massolo, C.P. (ed.) (La Plata Univ. Nacional (Argentina)); 344 p; ISBN 981-02-1374-3;
; 1993; p. 57-69; World Scientific; Singapore (Singapore); 15. Workshop on nuclear physics; Buenos Aires (Argentina); 14-18 Sep 1992

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Book
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Conference
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AbstractAbstract
[en] The core hole localization, multiplets in the singly core-excited state, and their Auger-like two-electron de-excitation are discussed in some diatomic systems from the viewpoint of the exchange interaction. The exchange repulsion arising from the core-core overlap is proved very small, indicating that the core electron is essentially localized on a specified atom, even in homonuclear systems. Relatively large core-valence exchange interaction between the adjacent atoms results in observable 1sσg-σu splittings in N2 and C2H2. The 1s→π* excitation of a doublet radical NO gives three different electronic states. The 2Σ- state energy relative to the 2Δ and 2Σ+ states is dependent on the exchange integral between the core and π* electrons. The two dipole-allowed 2Π 1s→σ* excited states of NO are characterized by singlet and triplet couplings between two of the three open-shell electrons. In the N 1s excitation, the σ* and π* electrons are strongly coupled with the triplet and singlet spins. In the O 1s, the core and π* electrons are weakly coupled; then, the singlet-coupled is lower in energy and weaker in intensity than the triplet. Triplet radicals O2, S2, and Se2 have two dipole-allowed 3Σu- 1s→σ* excited states with four open shells, which are characterized by doublet and quartet couplings among three of the four electrons. In the S and Se 1s excitations, the σ* and two π* electrons are relatively strongly coupled with the quartet and doublet spins. In the O 1s, the core and two π* electrons are weakly coupled; then, the doublet-coupled is lower in energy and weaker in intensity than the quartet. In the resonant photoionization via the 1s→π* and 1s→σ* excited states in NO and O2, the two-electron de-excitation selection and propensity rules are discussed in terms of state symmetry, spin multiplet and Sz value. In the case that the two electrons taking part in the de-excitation have the same spins, additional exchange-type interaction reduces the transition probability
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Source
S0301010402007917; Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Rennie, E.E.
Heriot-Watt Univ., Edinburgh (United Kingdom)1997
Heriot-Watt Univ., Edinburgh (United Kingdom)1997
AbstractAbstract
No abstract available
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Nov 1997; [vp.]; Available from British Library Document Supply Centre- DSC:DXN015572; Thesis (Ph.D.)
Record Type
Miscellaneous
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Thesis/Dissertation
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AbstractAbstract
[en] Energies and excitation probabilities for collective dipole states of negative parity are calculated using the Skyrme forces. The Wigner function moment method is used in the calculations. The giant dipole resonance, high-lying isoscalar and isovector compressional modes, and low-lying modes, which were discovered recently, are described well by the theory. 16 refs., 2 figs., 3 tabs
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Source
Translated from Yadernaya Fizika; 57: No. 5, 792-797(1994).
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Journal Article
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Translation
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Obaid, Rana; Kinzel, Daniel; Oppel, Markus; González, Leticia, E-mail: markus.oppel@univie.ac.at2014
AbstractAbstract
[en] Despite the concept of nuclear spin isomers (NSIs) exists since the early days of quantum mechanics, only few approaches have been suggested to separate different NSIs. Here, a method is proposed to discriminate different NSIs of a quinodimethane derivative using its electronic excited state dynamics. After electronic excitation by a laser field with femtosecond time duration, a difference in the behavior of several quantum mechanical operators can be observed. A pump-probe experimental approach for separating these different NSIs is then proposed
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Source
(c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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AbstractAbstract
[en] The excitation of the singlet S and P deg. levels of a Sr atom from the ground state by slow electrons was studied by the method of extended crossing beams. It was ascertained that perturbations manifest themselves in the behavior of the excitation cross sections in the spectral series arising as a result of the transitions from these levels. The perturbations affect to a larger extent the form of the optical excitation functions rather than the absolute values of the cross sections. The results obtained are compared with previous data
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Translated from Optika i Spektroskopiya , ISSN 0030-4034, 97, 724-729 (No. 5, 2004); (c) 2004 MAIK ''Nauka / Interperiodica''.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Translation
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AbstractAbstract
[en] Two methods for measuring lifetimes of excited states in nuclei are discussed. One recently developed method involves a plunger device and inverse kinematics Coulomb excitation with heavy beams. The other method covers a different lifetime range and relies on electronic timing. Both methods have recently been applied at Yale University. This paper will give a brief overview of technical aspects of those measurements. A short motivation and preliminary results of the experiments are given.
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18. international school on nuclear physics, neutron physics and applications; Varna (Bulgaria); 21-27 Sep 2009; Available from http://dx.doi.org/10.1088/1742-6596/205/1/012025; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Literature Type
Conference
Journal
Journal of Physics. Conference Series (Online); ISSN 1742-6596;
; v. 205(1); [7 p.]

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