共查询到20条相似文献,搜索用时 31 毫秒
1.
T. Fukuchi Y. Gono A. Odahara S. Tanaka M. Inoue Y. Wakabayashi T. Sasaki M. Kibe N. Hokoiwa T. Shinozuka M. Fujita A. Yamazaki T. Sonoda C. S. Lee Y. K. Kwon J. Y. Moon J. H. Lee 《The European Physical Journal A - Hadrons and Nuclei》2005,24(2):249-257
The high-spin states of 93Mo have been studied by a 82Se( 16O, 5n) 93Mo reaction at a beam energy of 100 MeV using techniques of in-beam -ray spectroscopy. Measurements of -t, --t coincidences, -ray angular distributions and -ray linear polarizations were performed. The high-spin isomer was found as a (39/2-) state at about 9.7 MeV. The near-yrast states in 93Mo were interpreted using the weak-coupling picture of a d5/2 neutron to a neutron magic core nucleus 92Mo. 相似文献
2.
The low-lying levels in 127La have been studied through the -decay of 127Ce ( T1/2 = 29s) produced by bombarding a natMo target with a 185-MeV 35Cl beam. Reaction products were on-line mass-separated, and -ray singles and - coincidence measurements were performed. Conversion electrons were also measured and multipolarities of transitions have been derived. The half-life of the 210.9-keV level was determined to be (1.9±0.3)ns by the - delayed coincidence technique. The level scheme obtained has been compared with calculations based on the Nilsson model. 相似文献
3.
A. Syntfeld H. Mach W. Kurcewicz B. Fogelberg N. Amzal J. Galy K. Gulda A. Korgul A. Lindroth W. A. Płóciennik M. Sanchez-Vega W. Urban 《The European Physical Journal A - Hadrons and Nuclei》2005,23(3):481-490
The --decay of 147Cs to 147Ba has been studied by means of - and X-ray spectroscopy. A new level scheme of 147Ba is significantly modified and extended in comparison to the one previously reported. The Advanced Time-Delayed (t) method has been applied to measure half-lives of the 46.2 and 85.4 keV levels in 147Ba yielding T1/2 of 510(80) ps and 370(100) ps, respectively. The lifetime results combined with the deduced internal conversion coefficients allowed to assign M1 multipolarity to three transitions. The B(M1) values obtained for the 39.2, 46.2 and 85.4 keV transitions range from 0.017 to 0.043 W.u. and represent typical B(M1) strength in the Ba-Er region. Model calculations using a shell correction approach with the axially deformed Woods-Saxon potential predict for 147Ba an octupole deformed ground state with 3 = 0.11. 相似文献
4.
Using the DFT/B3LYP method with the base set 631G**, we carried out calculation of the frequencies of the normal vibrations of porphin and of its five isotopic types. Scaling of force constants for outofplane vibrations has been performed in independent natural coordinates. The symmetry coordinates are introduced and a force field for outof plane vibrations of a porphin molecule in independent coordinates of symmetry is obtained. A new correlation of the frequencies of vibrations in the type of the symmetry B
1u
for the isotopic type of the d
2 porphin molecule is suggested on the basis of discrete analysis of the distribution of a potential energy. 相似文献
5.
Four new Hofmanntype complexes, M(DMTF)2Ni(CN)4, (where DMTF is dimethylthioformamide, M=Mn, Cd, Co, or Ni) were synthesized and their structure was determined by an elemental analysis and infrared spectroscopy. The IR spectra of DMTF and its nickel tetracyanine complexes with Mn(II), Cd(II), Co(II), and Ni(II) have been investigated within the range 4000–400 cm–1. The frequency shifts in the metal complexes agree with the assignment of the CS and CN frequencies. The complexes consist of infinite planar polymer layers of |MNi(CN)4|. Ndimethylthioformamide is coordinated to this layer from above and below; it is a monodentate ligand and is Sbonded through the metal atom in these complexes. 相似文献
6.
We have carried out a nonempirical quantumchemical calculation with full optimization of the geometry of all theoretically possible tautomeric forms of 3formyltetrinic acid (FTRA) according to the Møller–Plesset secondorder perturbation theory with the use of a 6–31G(d) double zeta basis set. The correlation corrections to the total energy of molecules for optimized geometric configurations were calculated in the 631G(d,p) basis. All the possible tautomeric forms of FTRA and the harmonic vibrational frequencies were also calculated within the density functional theory (DFT) with the use of the Perdew–Burke–Ernzerhof (PBE) functional in a threeexponent basis. It is shown that FTRA in vapors (in the perfect gas approximation) exists in the form of a mixture of three enol forms, among which two exoforms predominate. The frequencies and forms of normal vibrations for each cisenol tautomer in the region of vibrations of ketogroups and double bonds differ widely, which permits identification of the tautomers present in the mixture. The possible mechanisms of enolenol transformations of 3acyltetrinic acids are discussed. 相似文献
7.
L. Gaudefroy O. Sorlin C. Donzaud J. C. Angélique F. Azaiez C. Bourgeois V. Chiste Z. Dlouhy S. Grévy D. Guillemaud-Mueller F. Ibrahim K. -L. Kratz M. Lewitowicz S. M. Lukyanov I. Matea J. Mrasek F. Nowacki F. de Oliveira Santos Yu. -E. Penionzhkevich B. Pfeiffer F. Pougheon M. G. Saint-Laurent M. Stanoiu 《The European Physical Journal A - Hadrons and Nuclei》2005,23(1):41-48
The neutron-rich nuclei 2157, 58Sc, 2258-60Ti, 2360-63V, 2462-66Cr have been produced at Ganil via interactions of a 61.8A MeV 76Ge beam with a 58Ni target. Beta-decay studies have been performed using combined - and -ray spectroscopy. Half-lives have been determined and -decay schemes are proposed for 58Ti, 61V and 62Cr. From these studies, new hints for the existence of -decaying isomers in 60V and in 62Mn are provided. These results are compared to shell model calculations. The role of the f7/2- f5/2 proton-neutron interaction is examined through its influence on the lifetime values. 相似文献
8.
Marco D'Onorio De Meo Dieter W. Heermann Kurt Binder 《Journal of statistical physics》1990,60(5-6):585-618
Finite squareL×L Ising lattices with ferromagnetic nearest neighbor interaction are simulated using the Swendsen-Wang cluster algorithm. Both thermal properties (internal energyU, specific heatC, magnetization |M|, susceptibility) and percolation cluster properties relating to the physical clusters, namely the Fortuin-Kasteleyn clusters (percolation probability P
, percolation susceptibility
p, cluster size distributionn
l) are evaluated, paying particular attention to finite-size effects. It is shown that thermal properties can be expressed entirely in terms of cluster properties, P
being identical to |M| in the thermodynamic limit, while finite-size corrections differ. In contrast,
p differs from even in the thermodynamic limit, since a fluctuation in the size of the percolating net contributes to, but not to
p. NearT
c the cluster size distribution has the scaling properties as hypothesized by earlier phenomenological theories. We also present a generalization of the Swendsen-Wang algorithm allowing one to cross over continuously to the Glauber dynamics. 相似文献
9.
Z. Janas C. Mazzocchi L. Batist A. Blazhev M. Górska M. Kavatsyuk O. Kavatsyuk R. Kirchner A. Korgul M. La Commara K. Miernik I. Mukha A. Płochocki E. Roeckl K. Schmidt 《The European Physical Journal A - Hadrons and Nuclei》2005,23(2):197-200
The -decays of 110Xe and 106Te were studied at the GSI on-line mass separator. By using the grow-in and decay of the activity, observed in pulsed-beam measurement, the half-life of 110Xe was found to be T1/2 = 105+35-25ms. The lifetime of 106Te was determined to be T1/2 = 70+20-10s by measuring the time between two successive 110Xe {106} Te {102} Sn -decays. The newly determined half-lives were used to calculate reduced -decay widths for 106Te and 110Xe. Universal systematics of reduced widths are proposed to search for the evidence of enhancement of the formation amplitude in the emitters above 100Sn. 相似文献
10.
The -decay fine structure of 210-214Fr has been studied by --coincidence measurements. The nuclei were produced using the 12C on 209Bi reaction. Evaporation residues recoiling out of the target were separated in-flight by the velocity filter SHIP and stopped in a position-sensitive 16-strip PIPS-detector in order to study their subsequent decays. In the present work new and improved results for 210-214Fr, produced by -decay of the primary reaction products 214-218Ac, were extracted. The results are discussed and compared to previously published data. 相似文献
11.
M. Asai M. Sakama K. Tsukada S. Ichikawa H. Haba I. Nishinaka Y. Nagame S. Goto Y. Kojima Y. Oura H. Nakahara M. Shibata K. Kawade 《The European Physical Journal A - Hadrons and Nuclei》2004,22(3):411-416
EC and decays of 235Am have been studied using a gas-jet coupled on-line isotope separator. Excited states in 235Pu have been established for the first time by means of -ray spectroscopy following the EC decay of 235Am. The deduced log ft value suggests that the ground state of 235Am should have the 5/2-[523] configuration. The - coincidence result has revealed that the 5/2-[523] state in 231Np populated by the favored transition of 235Am is located at < 15 keV, which allows us to precisely determine the Q value of 235Am. 相似文献
12.
In situ transmission electron microscopy observations of the dislocation motion at vicinity of the /' interfaces in a Ni-base superalloy have been performed. They allow to identify the elemental mechanisms, under stress and at different temperatures, of the deformation propagation across the interfaces. It is shown that some of the mechanisms already analyzed in the literature occur. Moreover, new processes are revealed such as the formation of small dislocation pile-ups on the /' interfaces. Such a configuration, which increases the local stress, favors the overcoming of the interface.These observations together with new considerations on stresses are taken into account for proposing a new equilibrium equation for a dislocation abutting on a /' interface. This equation involves all the stress components acting on a dislocation: the applied stress, the misfit stress, the friction stress, the stress concentration due to the dislocation pile-up and the image stress. 相似文献
13.
R. Kumar Kuljeet Singh D. Mehta Nirmal Singh S. S. Malik E. S. Paul A. Görgen S. Chmel R. P. Singh S. Muralithar 《The European Physical Journal A - Hadrons and Nuclei》2005,24(1):13-22
The collective structures of 131Cs have been investigated by in-beam -ray spectroscopic techniques following the 124Sn (^11B , 4n) reaction at a beam energy Elab = 57MeV. The previously established rotational bands, built on g7/2, d5/2 and the unique-parity h11/2 orbitals, have been extended and evolve into new bands involving rotationally aligned (h11/2)2 and (h11/2)2 quasiparticles. In addition, a new multiquasiparticle band based on the g7/2 g7/2 h11/2 configuration has also been observed. Theoretical interpretations for the assigned configurations are discussed in the framework of Total Routhian Surface (TRS) and Tilted Axis Cranking (TAC) model calculations. TAC model calculations predict a decrease in the B(M1) values with increasing rotational frequency for the g7/2/d5/2 (h11/2)2 and h11/2 (h11/2)2 bands, thus indicating a magnetic rotation character for these bands. 相似文献
14.
A simple quark pair creation model is introduced to study exclusive decays of {c_J} into baryon-antibaryon pairs. With this simple model, some exclusive decay processes, for example, {c0} B¯ (B = ,0,-) are investigated and their decay widths are evaluated by inclusion of the properties of outgoing baryons, and the results show that the strengthened decay channels {c_J} ¯(J = 0, 2) are easily understood by considering only the color singlet contribution of P-wave charmonium. 相似文献
15.
G. Canchel B. Blank M. Chartier F. Delalee P. Dendooven C. Dossat J. Giovinazzo J. Huikari A. S. Lalleman M. J. Lopez Jiménez V. Madec J. L. Pedroza H. Penttilä J. C. Thomas 《The European Physical Journal A - Hadrons and Nuclei》2005,23(3):409-415
In an experiment performed at the Accelerator Laboratory of the University of Jyväskylä, the -decay half-life of 62Ga has been studied with high precision using the IGISOL technique. A half-life of T1/2 = 116.09(17) ms was measured. Using - coincidences, the intensity of the 954 keV transition and an upper limit of the -decay feeding of the 0+2 state have been extracted. The present experimental results are compared to previous measurements and their impact on our understanding of the weak interaction is discussed. 相似文献
16.
O. Costa de Beauregard 《Foundations of Physics Letters》1992,5(3):291-294
A misunderstanding persists between Stuart and me, which I do my best to clarify. Bayesian inverse subjectivities versus relativistic covariance and physical intersubjectivity are discussed. A joint number of chances formalism taking care of the propagation of the probability of causes is proposed. 相似文献
17.
M. Sawicka I. Matea H. Grawe R. Grzywacz M. Pfützner M. Lewitowicz J. M. Daugas B. A. Brown A. Lisetskiy F. Becker G. Bélier C. Bingham R. Borcea E. Bouchez A. Buta E. Dragulescu G. de France G. Georgiev J. Giovinazzo F. Hammache F. Ibrahim P. Mayet V. Méot F. Negoita F. De Oliveira-Santos O. Perru O. Roig K. Rykaczewski M. G. Saint-Laurent J. E. Sauvestre O. Sorlin M. Stanoiu I. Stefan C. Stodel Ch. Theisen D. Verney J. Żylicz 《The European Physical Journal A - Hadrons and Nuclei》2004,22(3):455-459
A decay spectroscopy study of the neutron-rich cobalt isotopes has been performed using fragmentation of a 86Kr36+ beam and the new LISE2000 spectrometer at GANIL. For 71Co and 73Co, the -delayed radiation has been observed for the first time, and the half-lives were found to be 79(5) ms and 41(4) ms, respectively. Features of the decay are discussed qualitatively in terms of nuclear models. 相似文献
18.
The -decay fine structure of 214Ac, 215Ac and 216Ac has been studied using the --coincidence technique. The nuclei were produced by 209Bi( 12C, xn)221-xAc-reactions. Evaporation residues were separated in-flight from the primary beam using the velocity filter SHIP at GSI, Darmstadt. The separated nuclei were implanted into a position-sensitive 16-strip PIPS Si detector and their subsequent decays were measured. In these studies new and improved decay data for 214-216Ac were obtained. 相似文献
19.
B. F. Kuntsevich 《Journal of Applied Spectroscopy》2002,69(5):732-738
The nonlinear dynamics of a twowave CO2 laser with continuous pumping by an electric discharge and loss modulation in both channels is investigated theoretically. In modulation of losses with the same frequencies it is possible, by changing the shift of the phases of modulating signals, to monitor simply enough the amplitude, form, duration, and depth of modulation and also the repetition rate of radiation. Depending on the shift of phases, the maximum response can be concentrated in the lowfrequency region or propagate also to the region of high frequencies. If losses in both channels are modulated with different frequencies, a change in the relationship between these frequencies predominantly leads to a change in the shape, magnitude, and structure of response in the lowfrequency region of the amplitudefrequency characteristic (AFCh). In the highfrequency region of the amplitudefrequency characteristic, beginning from the peaks of the doubling of the vibration period, where inphase modes of radiation are implemented, the response virtually does not change. Similar regularities are observed on change in the shift of phases. 相似文献
20.
H. De Witte A. N. Andreyev S. Dean S. Franchoo M. Huyse O. Ivanov U. Köster W. Kurcewicz J. Kurpeta A. Plochocki K. Van de Vel J. Van de Walle P. Van Duppen 《The European Physical Journal A - Hadrons and Nuclei》2005,23(2):243-247
A new measurement of the 200Fr -decay half-life, with improved accuracy compared to previous measurements, has been carried out at the Isolde-CERN on-line mass separator. A half-life of 49(4) ms has been obtained, which is substantially different from earlier literature values. For the 196At daughter decay, a half-life of 389(54) ms and an branching ratio b = 94(5)% were measured. In addition, the half-lives of 201, 203, 205Fr and 197,199At are reported. 相似文献