共查询到20条相似文献,搜索用时 687 毫秒
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Low-lying states in 96Tc excited through the 96Mo(d, 2nγ) reaction have been investigated by means of on-line internal conversion electron and γ-ray spectroscopy. Measured singles spectra and relative excitation functions together with particle-γ and γ-γ coincidences were used to identify and fit the transitions in a level scheme. The low-lying positive-parity states 2+–7+and negative-parity states 2? and 3? are compared with those appearing systematically in doubly odd 94, 98Tc and 92–96Nb isotopes. Comparison is also made with simple shell-model calculations for those nuclei based on the configuration space and the tendency of the multiplet structure of the wave functions is discussed. 相似文献
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Differential cross sections for 87Sr(d, t)86Sr transitions to the states of 86Sr were obtained with the Pittsburgh 18 MeV deuteron beam and the Enge split-pole spectrograph. States of 86Sr up to 3.82 MeV in excitation were studied with a total resolution of 12 keV. Successful distorted-wave Born approximation (DWBA) predictions for 87Sr(d, t) 86Sr angular distributions permitted the extraction of l-values and spectroscopic strengths. The sum-rule value agrees with the observed value for the configuration. The observed strength is spread over 13 states. Contrary to an earlier interpretation, the 0+ ground state is found to contain only 65% of the strength. Similarly, the full 4+ strength is not located in a single state. The new data change the interpretation of the spectrum of 86Sr. They significantly alter the deduced low-spin matrix elements and bring them into much closer agreement with those derived from 88Y. Several new negative-parity states dominated by l = 1 orbital angular momentum transfer have also been identified. 相似文献
4.
Low-lying states in 95Tc were studied with the 93Nb(α, 2nγ)95Tc reaction. The level scheme was obtained from the γ-γ coincidence measurement. The spin assignment was made on the basis of the observed γ-ray angular distributions and the excitation functions. The states, and possibly state, are found to be strong candidates for the core multiplet states . These states are discussed in term of a weak coupling model and the dressed three-quasiparticle model. The observed γ-ray angular distributions are compared with expectations based on a simple deexcitation model of the (α, 2nγ) reaction. 相似文献
5.
R. Lutter O. Häusser D.J. Donahue R.L. Hershberger F. Riess H. Bohn T. Faestermann F.v. Feilitzsch K.E.G. Löbner 《Nuclear Physics A》1974,229(2):230-240
The g-factor of the 480 ns, 9? isomer at 2.237 MeV in 200Pb was measured by the time-differential perturbed angular distribution method. The result, g = ?0.0285±0.0011 confirms the rather pure quasiparticle structure of this state. Half-lives of 480±20 ns, 43±3 ns and 42±4 ns have been measured for the 2237 keV 9?, 2154 keV 7? states in 200Pb and the 2208 keV state in 202Pb, respectively; E2 transitions and g-factors of negative-parity states in even, neutron-deficient Pb isotopes are discussed. 相似文献
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Accurate SCF computations are reported on the Rydberg states of N2 of electron configurations , , and ---3σg2πg, also on the valence states of the configuration . The Rydberg state calculations supplement those of Lefebvre-Brion and Moser. A comparison is made between the states and the parallel set of states of the configuration. This comparison shows a sharp difference in the 1Σ+ states of the two configurations, the 1Σ+ state being very high in the latter but relatively low in the former configuration. Recknagel coefficients are given for the several states of the two configurations; as expected, these are much smaller for the configuration. Also, the 1Δ state is relatively lower for the latter configuration. 相似文献
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A theoretical model used to describe the and B3Πg states of N2 is presented. Using recently acquired high resolution spectra of the (0-0) band, rotational energy levels of the v = 0 vibrational levels of these two states are generated with this model. These levels are in excellent agreement with those obtained using a combination differences technique. The precision of the model generated levels is 0.01 cm?1. The previously unpublished rotational levels of Dieke and Heath for the , B3Πg and C3Πu states are referenced to the (v = 0, J = 0) ground level and tabulated here. Estimates of the precision of their work are made. 相似文献
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A. Filevich A. Ceballos M.A.J. Mariscotti P. Thieberger E. Der Mateosian 《Nuclear Physics A》1978,295(3):513-524
The 6? and 7? isomeric states in 66Ga and 68Ga at 1440.9 and 1229.6 keV, respectively, have been populated with the (13C, 2np) and (15N, n2p) reactions on natural Fe. The half-lives of these states have been measured to be and . Using previous data on the hyperfine field of Ga in Fe, the g-factors of these states have been determined by means of the TDPAD method. The results are and . These values are in very good agreement with the independent particle model if one assumes the and configurations and uses the empirical proton and neutron g-factors from odd-A neighboring nuclei instead of the Schmidt values. The large disagreements with experiment when Schmidt values are used show that core polarization effects are important in these nuclei. 相似文献
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92, 94Nb and 94, 96, 98Tc have been produced by the (p, n) reaction at proton energies on and near the isobaric analog resonance. 95,97Tc have been produced by the (p, γ) reaction below the (p, n) threshold. Internal conversion electrons due to the decay of their excited states were detected on-line with a mini-orange spectrometer which is optimized for the energy range 50 to 500 keV. Gamma rays from these nuclei were detected with a thin Ge(Li) detector. Isomeric-delayed internal conversion electrons and γ-rays were observed, using a nanosecond-pulsed beam. The internal conversion coefficients for 55 transitions in these nuclei have been determined and their multipolarities deduced. The multipolarity of the transitions in these nuclei is predominantly M1. Negative parities have been assigned through use of the isobaric analog resonance enhancements of the population of negative-parity final states. The systematic behavior of the 2?, 3? doublet and of the multiplet in these nuclei is discussed. 相似文献
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C. Günther M.V. Banaschik H. Hübel W.D. Schneider K.H. Gonsior P. Herzog 《Nuclear Physics A》1975,244(2):287-300
High spin states in the ) multiplet in 93Mo were investigated with the 93Nb(p, n) 93Mo reaction. A new isomeric state at 2430 keV with a half-life of 3.53±0.18 ns is interpreted as the lower member of the multiplet. A number of further states have been identified. The results are compared to previous experiments and shell model calculations. 相似文献
12.
S.I. Hayakawa S.K. Mark J.K. Lee J.E. Kitching G.C. Ball W.G. Davies 《Nuclear Physics A》1973,199(3):560-570
States in 92Tc have been studied by means of the 92Mo(3He, t) reaction at 27.5 MeV. The Q-value for this reaction and the excitation energy of the isobaric ground state analogue of 92Mo were determined to be ?7.882 ± 0.030 MeV and 3.813 ± 0.030 MeV respectively. Strongly populated levels in 92Tc appear to belong to configurations arising from the multiplet. 相似文献
13.
R. Kroth S.K. Bhattacherjee C. Günther M. Guttormsen K. Hardt H. Hübel A. Kleinrahm 《Physics letters. [Part B]》1980,97(2):197-199
The g-factors of the 10+ isomeric states in 194Hg and 196Hg have been measured using the in beam IPAD method. The results and are in agreement with the value expected for an (?2) neutron satructure and clearly contradict the previous assignment as () proton configurations. Cranking model calculations show that the neutron excitation energies in the rotating frame agree satisfactorily with the experimental energies and that the proton excitations are expected ≈2 MeV above the experimental yrast line 相似文献
14.
Robert S. Mulliken 《Journal of Molecular Spectroscopy》1976,61(1):92-99
Predissociations in the y1Πg and Rydberg states of N2 (configurations and , respectively) and their likely causes, are discussed. Peaking of rotational intensity at unusually low J values, without sharp breaking off, is interpreted as due to case c? or case ci predissociation. Λ doubling in the y state, attributed to interactions with the state and with another, 1Σ+, state of the same electron configuration as x, is analyzed. From this analysis the location of the (unobserved) state, here labeled x′, is obtained. It is concluded that the predissociation in the Π+ levels of the y state is an indirect one mediated by the interaction with x′ coupled with predissociation of x′ by a state dissociating to atoms: combined, however, with perturbation of the y state by the k1Πg Rydberg state (configuration ), whose Π+ levels are completely predissociated. 相似文献
15.
The magnetic moments of the 12+ isomers in 192, 196, 198, 200, 206Pb and of the isomer in 205Pb have been measured using the PAD technique. The results for the g-factors are: g(192) = ?0.173(2), g(196) = ?0.1600(15), g(198) = ?0.1552(15), g(200) = ?0.1512(15), g(206) = ?0.1496(18), and g(205) = ?0.148(5). As all states have a rather pure configuration, the values reflect directly the orbital. They show a decrease towards the more neutron-deficient isotopes attributed to the reduced core polarisation as a result of decreasing occupation of the neutron shell. The measured systematics are discussed regarding core polarisation, mesonic corrections, and small admixtures of core-excited states to the wave function. 相似文献
16.
J.A. Pinston W. Mampe R. Roussille K. Schreckenbach D. Heck H.G. Börner H.R. Koch S. Andre D. Barneoud 《Nuclear Physics A》1979,321(1):25-44
Gamma and electron spectra following thermal neutron capture on 99Tc have been studied with a bent-crystal spectrometer, Ge(Li) and Si(Li) detectors and a magnetic spectrometer. Prompt and delayed γ-γ coincidences with Ge(Li) detectors have been performed. A level scheme is proposed for 100Tc comprising 21 excited states up to 640 keV. The binding energy of the last neutron in 100Tc was deduced. For most levels, spin and parity values were assigned. Two isometric transitions of respective half-lives 10.2 and 4.6 μs have been identified using the 100Mo(d, 2n)100Tc reaction with a pulsed beam of deuterons. From the comparison of the present (n, γ) study and the collaborative study of the 99Tc(d, p) reaction, several members of the multiplets , , and have been identified. 相似文献
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The 46, 48, 50Ti(p, α) 43, 45, 47Sc reactions have been studied at a proton energy of 40.35 MeV with an overall energy resolution of about 80 keV FWHM. Angular distributions for states with excitation energies up to about 7 MeV in 43Sc and 45Sc and up to 8.4 MeV in 47Sc are presented. Both positive- and negative-parity states were observed. A microscopic form factor formalism for the three-nucleon transfer reaction was applied to extract quantitative information. Zeroth order calculations have been performed assuming the simplest possible configuration for the transferred nucleons. Subsequently, the ( shell-model wave functions of Kutschera et al. have been used in a more detailed test, considering the components with different neutron angular momentum couplings. Reasonable agreement was obtained for most of the states considered. The effect on the calculated analyzing power of including different configurations for the g.s. transition in 47Sc was found to be small. 相似文献
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The absorption and MCD spectra of the , , and spin-allowed transitions of Cr3+ in K2NaGaF6 are reported. It is shown that transitions to the . states are induced by T1u vibratio the other spin-allowed transition, , there are three competing intensity mechanisms: electric dipole induced by T1u vibrations, electric dipole induced by T2u vibrations and magnetic dipole, and an estimate is made of the relative importance of these. The magnetic dipole zero-phonon line is observed to be accompanied by a vibrational sideband for which the coupling is predominantly with T2u vibrations. Other weak transitions are observed in MCD spectra and their origin briefly discussed. 相似文献
20.
C.V.K. Baba D.B. Fossan T. Faestermann F. Feilitzsch P. Kienle C. Signorini 《Physics letters. [Part B]》1973,43(6):483-486
The difference in g-factors for the 61+ and 81+ states in 210Po has been measured as . This result represents a small violation of additivity. A value of g8 = 0.909 ± 0.011, independent of g6, was also obtained. 相似文献