共查询到20条相似文献,搜索用时 15 毫秒
1.
T.L. Khoo F.M. Bernthal C.L. Dors M. Piiparinen S. Saha P.J. Daly J. Meyer-Ter-Vehn 《Physics letters. [Part B]》1976,60(4):341-343
Positive parity levels in 191Pt obtained from (α, xnγ) reactions and β-decay are presented as a first example of a rather complete level family. The spectrum confirms triaxial shapes found before from and proton structures in this mass region. In addition to the usual decoupled yrast band, a second ΔI = 2 band within the family, built on a low-lying state, is observed in agreement with theory. 相似文献
2.
Clive E. Barnes John M. Brown Alan D. Fackerell Trevor J. Sears 《Journal of Molecular Spectroscopy》1982,92(2):485-496
Lines in the ν3 (“antisymmetric” stretch) fundamental of the NCO radical in the state were studied by CO laser magnetic resonance. The observations were assigned to P and R lines in the vibration-rotation band and lead to a precise determination of the vibrational interval and the anharmonic correction to the rotational constant: ν3 = 1920.60645(19) cm?1, α3 = 0.003338(21) cm?1. A single transition in the hot band (011)-(010), was detected. This observation is used to determine the origin of the hot band as 1907.11892(20) cm?1, i.e., the anharmonicity parameter x23 = ?13.48753(28) cm?1. 相似文献
3.
D.M. Gordon M. Gai A.K. Gaigalas R.E. Shroy D.B. Fossan 《Physics letters. [Part B]》1977,67(2):161-164
Systematic ΔJ = 2 bands have been observed on the , and quasi-proton states in A = 117?127 odd-I nuclei. The ΔJ = 2 energy spacings decrease (relative to the Te cores) as A decreases for the band but not for the others. Also ΔJ = 1 bands on unsually low-lying proton-hole states exist. 相似文献
4.
A weak emission spectrum of I2 near 2770 Å is reanalyzed and found to to minate on the A(1u3Π) state. The assigned bands span v″ levels 5–19 and v′ levels 0–8. The new assignment is corroborated by isotope shifts, band profile simulations, and Franck-Condon calculations. The excited state is an ion-pair state, probably the 1g state which tends toward . In combination with other results for the A state, the analysis yields the following spectroscopic constants: T″e = 10 907 cm?1, ″e = 1640 cm?1, ω″e = 95 cm?1, ; T′e = 47 559.1 cm?1, ω′e = 106.60 cm?1, . 相似文献
5.
P. Kemnitz P. Ojeda J. Döring L. Funke L.K. Kostov H. Rotter E. Will G. Winter 《Nuclear Physics A》1984,425(3):493-520
Excited states in 82Kr have been studied in the reaction 80Se(α, 2n) by using in-beam γ-ray spectroscopy. Measurements of γγ coincidences, excitation functions, angular distributions and the linear polarization of the γ-rays have been carried out. All together, 38 levels have been identified up to and excitation energies up to 6 MeV. For 23 of these levels the mean lifetime could be determined by Doppler shift and the pulsed-beam γ-timing methods. Most of the levels could be grouped into collective bands according to measured B(E2) values. Two sequences, Iπ = 8+, 10+, 12+, are interpreted as rotation-aligned 2q.p. bands built up on protons and neutrons, respectively. Interaction matrix elements between these bands were deduced as V ? 10 keV. Additional states, Iπ = (6+), 7+, 8+, indicate coexistence of rotation-aligned and deformation-aligned 2q.p. excitations. An odd-parity ΔI = 1 band is ascribed to proton excitations of the type . Several fast M1 transitions with B(M1) = 0.1–1 W.u. have been observe states of equal spin. They are interpreted as being due to configuration mixing. 相似文献
6.
P. Van Nes W.H.A. Hesselink W.H. Dickhoff J.J. Van Ruyven M.J.A. De Voigt H. Verheul 《Nuclear Physics A》1982,379(1):35-60
The 113, 115In(α, 3nγ)114, 116Sb reactions have been studied using γ-ray spectroscopic techniques. The experiments included γ-ray excitation function, γ-γ coincidence, lifetime, γ-ray angular distribution and conversion electron measurements. A ΔJ = 1 rotational band has been observed in either of the 114, 116Sb final nuclei. Energy spacings and electromagnetic properties of the band show strong resemblances with those of rotational bands in the adjacent odd-mass Sb nuclei. In addition two-quasiparticle and two-quasiparticle core coupled states have been observed in these nuclei. One isomer was identified in 116Sb, i.e. a Jπ = 11+ state at 1889 keV (). A simple model is proposed which explains the ΔJ = 1 band in terms of rotational alignment of the neutron with the deformed rotating odd-A core. 相似文献
7.
E. Hammarén E. Liukkonen M. Piiparinen J. Kownacki Z. Sujkowski Th. Lindblad H. Ryde 《Nuclear Physics A》1979,321(1):71-108
The 146, 148Nd(α, χn) and 148, 150Nd(3He, χn) reactions at Eα = 20–43 MeV and E3He = 19–27 MeV, are used to study excited states in the 149Sm86 and 149Sm87 nucleides and consequently the low-spin odd-parity excitation. The mixing ratios and multipolarities of the most prominent transitions are deduced from the combined evidence of angular distribution and electron conversion data. The spin-parity assignments for most of the levels observed are established. In 148Sm the ground state band extending to Iπ = 10+ is predominantly populated. A negative-parity odd-spin band extending from Iπ = 3?through 11? is also observed. The bands in 148Sm are interpreted within the framework of the interacting boson approximation model. In 149Sm positive-parity levels with spin up to and negative-parity levels with spins up to are observed. The predominant γ-decay proceeds via transitions associated with , , and intrinsic configurations. The branching ratios B(E1)/B(E2) are calculated and compared in both 148Sm and 149Sm nucleides. The B(E1)/B(E2) dependence on the value of Z for some N = 86 (as well as 88 and 84) isotones showing a minimum of Z = 64 was noted. A 4 ns high-spin isomer mainly decaying into the positive-parity band based on the state in 149Sm is found. Experimental evidence is presented to interprete the , , … and , , …, ΔI = 2, sequences in 149Sm as arising from the coupling of an neutron to the octupole and quadrupole modes of the 148Sm core nucleus. The absolute reaction cross sections for the 146, 148, 150Nd(3He, χn) reactions have been determined for different bombarding energies. The mixing of the and shells is discussed in the framework of an axial-particle-rotor model calculation. 相似文献
8.
J. Rekstad M. Guttormsen T. Engeland G. Løvhøiden O. Straume J. Lien C.E. Ellegaard 《Nuclear Physics A》1979,320(2):239-259
The level structure of 153Sm has been studied by means of the 150Nd(α, n)153Sm reaction. The experiment included measurements of the γ-γ coincidences and γ-ray yield as a function of projectile energy. The rotational band built on the [505] Nilsson orbital was observed up to spin , and two ΔI = 2 bands of positive parity were identified with spins up to , respectively. These bands are associated with the single-particle structure.The data obtained in the present work together with data available in the literature are compared to the result of a particle-rotor coupling calculation. The 153Sm nucleus is found to be a wellbehaved rotor. An appropriate single-particle level scheme for 153Sm is established. 相似文献
9.
L.E. Erickson 《Optics Communications》1977,21(1):147-149
The nuclear quadrupole hyperfine splittings of Pr3+ in LaF3 have been measured for the ground electronic state using a RF optical resonance technique. A hamiltonian 2-)] was fitted to the data with zP=4.185 ± 0.003 MHzandη = 0.105 ± 0.010. Linewidths of 180 kHz were observed. 相似文献
10.
Robert W. Field Richard A. Gottscho E. Miescher 《Journal of Molecular Spectroscopy》1975,58(3):394-413
No perturbation between two valence states of NO has ever been identified, although many valence-Rydberg and several Rydberg-Rydberg perturbations have been extensively studied. The first valence-valence crossing to be experimentally documented for NO is reported here and occurs between the 15N18O B2Π (v = 18) and B′2Δ (v = 1) levels. No level shifts larger than the detection limit of 0.1 cm?1 are observed at the crossings near and ; two crossings involving higher rotational levels could not be examined. Semi-empirical calculations of spin-orbit and Coriolis perturbation matrix elements indicate that although the electronic part of the interaction is large, a small vibrational factor renders the 15N18O B (v = 18) ? B′ (v = 1) perturbation unobservable. Semi-empirical estimates are given for all perturbation matrix elements of the operators and which connect states belonging to the configurations , , and . 相似文献
11.
12.
The investigation of the emission infrared spectrum of P2 was performed with a high resolution Fourier spectrometer. Two new electronic systems were attributed to b3Πg → w3Δu and A1Πg → W1Δu transitions. The molecular parameters are obtained by a complete fitting procedure. The main equilibrium constants of the new states are (in cm?1): 相似文献
13.
The 276-nm absorption band system () of m-dichlorobenzene was photographed under high resolution. The electronic origin band (0, 0) and a band at (0 + 380) cm?1 were subjected to rotational “band contour” analysis. As a result, it is found that the origin band has a type A band contour and that at (0 + 380) cm?1 exhibits a type B band contour. The band contour analysis also yields an accurate determination of the excited state parameters, viz., A′ = 0.0911 ± 0.0003, B′ = 0.02852 ± 0.00005, and C′ = 0.02175 ± 0.00001 cm?1. A model geometry for the molecule m-DCB in its first excited singlet state has been proposed. 相似文献
14.
The ratio of the scale parameter Λ in massless QCD defined on a lattice to the one in the continuum theory is determined by performing one-loop renormalization of the coupling constant. Our calculation method on a lattice directly relates Λlattice to the continuum one in the minimal subtraction scheme. The effect of incorporation of massless quarks depends on a parameter λ which is introduced to avoid trouble with fermions on a lattice. For λ=1, which is Wilson's value, the ratio previously calculated by Hasenfratz in the pure gauge theory is changed as follows: Critical properties of the lattice QCD will also be discussed briefly. 相似文献
15.
P. Mukhopadhyay 《Solid State Communications》1978,27(10):1037-1039
Tunneling in the asymmetric superconducting junctions of PbIn and PbTl shows sharp current steps at voltages eV = Δ1 + Δ2, (structures for n > 1 not readily observed); 2Δ1 and 2Δ2 are the energy gaps and n is an integer. We obtain new results for the relative magnitude of the structures, where the larger of the two structures is observed at the larger of the two voltages . These results, in contrast to other available experimental results on different superconductors, seem to exclude self-coupling theory as the mechanism. 相似文献
16.
A red-degraded band head, normally badly overlapped by the gamma system, , of zirconium oxide, appears in emission spectra of zirconium arcs and in absorption spectra of S-type stars and of frozen rare gas matrices containing zirconium. The emission band has been examined at high-resolution with the aid of separated zirconium isotopes. Identification of the band as 0-0 of a system of zirconium oxide is confirmed by rotational analysis where the following constants (cm?1) are obtained for 90Zr16O: The Λ-type doubling in the 1Π state and the question of whether or is the true ground state of ZrO are discussed. 相似文献
17.
18.
E Miescher 《Journal of Molecular Spectroscopy》1974,53(2):302-310
The spectrum of the electronic NO laser has been photographed with high resolution in the region 10 100–10 500 Å. It shows the band system F2Δ-C2Π whose upper and lower states are both Rydberg states configurationally mixed with valence states. Only predissociated rotational levels of the lower state appear in the spectrum. For v = 0 of C2Π a single mixed level , very close to the dissociation limit, gives rise to laser lines. 相似文献
19.
Keiji Matsumura Kentarou Kawaguchi Keiichi Nagai Chikashi Yamada Eizi Hirota 《Journal of Molecular Spectroscopy》1980,84(1):68-73
The v = 1 ← 0 vibration-rotation bands of the NS radical in the and electronic states were observed by using a tunable diode laser. From the least-squares analysis the band origins were determined to be 1204.2755(12) and 1204.0892(19) cm?1, respectively, for and . The rotational and centrifugal distortion constants and the internuclear distance in the X2Π electronic state were obtained as follows: Be = 0.775549(10) cm?1, De = 0.00000129(33) cm?1, and , with three standard deviations indicated in parentheses. 相似文献
20.
An energy-independent multipole analysis of pion photoproduction in the first resonance region has been performed in which special care has been taken in the selection and normalization of the data. The results obtained are a significant improvement on those of earlier analyses. Three features are of particular interest: a zero in the multipole at resonance; a smooth multipole showing the onset of the P11(1470) resonance; and evidence for the position of the Δ+ resonance being different from those of the Δ++ and Δo resonances. A comparison is made with the recent energy-dependent analyses, indicating agreement in the gross features of the multipoles but showing significant differences in essential details. 相似文献