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  • 1
    Electronic Resource
    Electronic Resource
    Streamwise and spanwise vortex interaction in an axisymmetric jet. A computational and experimental study (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 1515-1524 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The near-field of an azimuthally excited round jet was investigated in a combined computational/experimental study. The reaction zones in the jet were visualized using OH Planar-Laser- Induced-Fluorescence (PLIF) diagnostics. Both axisymmetric and azimuthal modes of the jet were excited to stabilize its spatial structure. Three-dimensional flame visualization of the laboratory jet reconstructed from multiple two-dimensional images acquired at constant phase angle, reveal a complex structure of the reaction zone. Time-dependent numerical simulations provided insight into the underlying fluid-dynamical processes leading to this flame structure. Simulations of reactive and non-reactive free jets used a Monotonically Integrated Large-Eddy-Simulation (MILES) approach, multi-species diffusive transport, global finite-rate chemistry and appropriate inflow/outflow boundary conditions. The flow visualizations of the experimental and computational jets strongly resemble each other, revealing tight coupling between axisymmetric vortex rings and braid (rib) vortices. The jet vorticity evolution is dominated by the dynamics of vortex-ring self-deformation induced by the azimuthal excitation imposed at the jet exit, the dynamics of rib vortices forming in the braid regions between undulating vortex rings, and strong interactions between rings and ribs. The observed topological features of the flow are directly related to the nearly-inviscid jet vorticity dynamics. These processes affect the mixing pattern of the jet, resulting in localized regions of high fuel concentration leading to combustion inactive regions in the flame, and other regions with enhanced mixing and a proper air-to-fuel ratio in the flame where the combustion process is intense. The vorticity dynamics and ensuing mixing processes determine the regions of combustion within the flame and thus the overall heat release pattern. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868927
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  • 2
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    Identification of the J^{π} =1^{−} state in ^{218} Ra populated via α decay of ^{222} Th (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-07-13
    Description: Author(s): E. Parr et al. The α decay of Th 222 populating the low-lying J π = 3 − state, and also a proposed 1 − state, in Ra 218 has been observed. The observations suggest an excitation energy of 853 keV for the 1 − state, which is 60 keV above the 3 − state. The hindrance factors of these α decays give a possible boundary to the … [Phys. Rev. C 94, 014307] Published Tue Jul 12, 2016
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Twisted superspace: Non-renormalization and fermionic symmetries in certain heterotic-string-inspired non-supersymmetric field theories (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-08-24
    Description: Author(s): Stefan Groot Nibbelink and Erik Parr Inspired by the tachyon-free nonsupersymmetric heterotic SO ( 16 ) × SO ( 16 ) string we consider a special class of nonsupersymmetric field theories: those that can be obtained from supersymmetric field theories by supersymmetry-breaking twists. We argue that such theories, like their supersymmetric counte… [Phys. Rev. D 94, 041704(R)] Published Tue Aug 23, 2016
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Fine structure in the $α$ decay of high-spin isomers in $^{155}\mathrm{Lu}$ and $^{156}\mathrm{Hf}$ (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-08-30
    Description: Author(s): E. Parr et al. Fine structure in the α decay of high-spin isomers in Lu 155 ( 25 / 2 − ) and Hf 156 ( 8 + ) has been studied for the first time using α γ -coincidence analysis. Three new α decays from Lu 155 ( 25 / 2 − ) and two from Hf 156 ( 8 + ) have been identified, populating seniority s 〉 1 states in the N = 82 nuclei Tm 151 and Yb 152 ,... [Phys. Rev. C 98, 024321] Published Wed Aug 29, 2018
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Rearrangement of valence neutrons in the neutrinoless double-β decay of ^{136} Xe (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-11-16
    Description: Author(s): S. V. Szwec, B. P. Kay, T. E. Cocolios, J. P. Entwisle, S. J. Freeman, L. P. Gaffney, V. Guimarães, F. Hammache, P. P. McKee, E. Parr, C. Portail, J. P. Schiffer, N. de Séréville, D. K. Sharp, J. F. Smith, and I. Stefan In neutrinoless double- β decay such as 136 Xe to 136 Ba, two neutrons become two protons, thus rearranging the occupancy of protons and neutrons in the ground states of the parent and daughter nuclei. From precision measurements of the cross sections of single-neutron adding and -removing reactions, the authors extract the change in ground-state neutron occupancies between 136 Xe and 136 Ba. Along with recent results on the proton occupancies, the new experimental neutron occupancies disagree with those used in existing theoretical calculations of the rate of this elusive β -decay mode, and provide a ​ ​basis for improved estimates of the uncertainties for new calculations. [Phys. Rev. C 94, 054314] Published Tue Nov 15, 2016
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
    Electronic Resource
    Electronic Resource
    Vibronic coupling and other many-body effects in the 4σ−1g photoionization channel of CO2 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 949-956 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibrational branching ratios and photoelectron angular distributions were measured for 4σ−1g photoionization of CO2 in the energy range 20–28 eV. Of particular interest are three vibrational components of the resulting CO+2 C˜ 2Σ+g state—the allowed (000) and (100) bands and the forbidden (101) band. The wavelength dependence of the beta parameter for the forbidden band deviated significantly from that of the two allowed bands, showing instead a strong resemblance to that of the B˜ 2Σ+u state. This behavior suggests that vibronic coupling to the B˜ 2Σ+u state is responsible for the appearance of the forbidden (101) band in the C˜ 2Σ+g state photoelectron spectrum. We also observe evidence for other many-body effects—shape-resonance-induced continuum–continuum coupling and doubly excited autoionizing resonances—in the present data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459985
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  • 7
    Electronic Resource
    Electronic Resource
    Autoionization dynamics in the valence-shell photoionization spectrum of CO (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 812-819 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Autoionizing Rydberg series in the valence-shell spectrum of CO have been studied by determining the high resolution relative photoionization cross section of cooled CO in the energy region 14.0–20.0 eV and by determining the vibrational branching ratios and the photoelectron angular distributions for production of CO+ X 2Σ+, v+=0–2 in the energy region 16.75–18.75 eV. Of particular interest are three prominent spectral features between 17.0 and 17.5 eV that result from interactions involving Rydberg series converging to the excited A 2Π and B 2Σ+ states of the ion. The results are discussed in the context of recent two-step multichannel quantum defect theory calculations by Leyh and Raseev (the following paper).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455204
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  • 8
    Electronic Resource
    Electronic Resource
    Atoms in molecules: Reply to Bader's Comment (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 3135-3135 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450978
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  • 9
    Electronic Resource
    Electronic Resource
    Vibrationally resolved photoelectron studies of the 7σ−1 channel in N2O (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 1551-1556 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present vibrationally resolved photoelectron studies of the 000, 100, 200, and 001 modes of the A˜ state (7σ−1) of N2 O+ in the 17.4–26 eV photon-energy range. The vibrational branching ratios σ(100)/σ(000) and σ(001)/σ(000) agree very well with fluorescence measurements by Kelly et al. and qualitatively with recent theoretical predictions of Braunstein and McKoy. The large non-Franck–Condon variations in the σ(100)/σ(000) and σ(200)/σ(000) branching ratios are associated with a predicted 7σ→εσ shape resonance near 20 eV. Overall, the vibrational branching ratios imply lower resonant energies for the stretching modes (100 and 200) and a similar resonant energy for the asymmetric stretch (001), compared with the 000 mode. The vibrational asymmetry parameters (β) display a strong variation with energy which is qualitatively reproduced by theory; however, the experimental values for β(100) and β(001) exhibit additional structure around 20 eV. When combined with theory and recent fluorescence data, these results help to demonstrate a correlation of shape resonance energy with overall molecular length (RN–N+RN–O); this important result implies a resonant state which is localized on the entire triatomic molecular frame rather than on the N–N or N–O components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456098
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  • 10
    Electronic Resource
    Electronic Resource
    Molecular hardness and softness, local hardness and softness, hardness and softness kernels, and relations among these quantities (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 2554-2557 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Hardness and softness kernels η(r,r') and s(r,r') are defined for the ground state of an atomic or molecular electronic system, and the previously defined local hardness and softness η(r) and s(r) and global hardness and softness η and S are obtained from them. The physical meaning of s(r), as a charge capacitance, is discussed (following Huheey and Politzer), and two alternative "hardness'' indices are identified and briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454034
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