Photofragmentation of ClNO in the A-Band:  Velocity Distribution and Fine-Structure Branching Ratio of Cl(2Pj) Atoms

1996 ◽  
Vol 100 (30) ◽  
pp. 12321-12328 ◽  
Author(s):  
Vladimir Skorokhodov ◽  
Yoshihiro Sato ◽  
Kunihiro Suto ◽  
Yutaka Matsumi ◽  
Masahiro Kawasaki
Keyword(s):  
Fine Structure ◽  
Velocity Distribution ◽  
Branching Ratio

scholarly journals Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector

2019 ◽  
Vol 218 ◽  
pp. 02012
Author(s):  
Graziano Venanzoni
Keyword(s):  
Fine Structure ◽  
Energy Region ◽  
Direct Evidence ◽  
Branching Ratio ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Recent Measurement ◽  
Single Measurement ◽  
Lepton Universality ◽  
Hadronic Contribution

I will report on the recent measurement of the fine structure constant below 1 GeV with the KLOE detector. It represents the first measurement of the running of α(s) in this energy region. Our results show a more than 5σ significance of the hadronic contribution to the running of α(s), which is the strongest direct evidence both in time-and space-like regions achieved in a single measurement. From a fit of the real part of Δα(s) and assuming the lepton universality the branching ratio BR(ω → µ+µ−) = (6.6 ± 1.4stat ± 1.7syst) · 10−5 has been determined

Photoneutron cross sections in 7Li

1977 ◽  
Vol 55 (5) ◽  
pp. 428-433 ◽  
Author(s):  
H. Ferdinande ◽  
N. K. Sherman ◽  
K. H. Lokan ◽  
C. K. Ross
Keyword(s):  
Fine Structure ◽  
Excited State ◽  
Cross Section ◽  
Cross Sections ◽  
Ground State ◽  
Reasonable Agreement ◽  
Branching Ratio ◽  
Energy Spectra ◽  
Average Value ◽  
First Excited State

Photoneutron energy spectra from 7Li have been measured by time-of-flight methods, for bremsstrahlung end-point energies increasing in 2 MeV steps from 13 to 25 MeV. The ground-state and approximate first-excited-state differential cross sections at 90° have been obtained from 8.5 to 23 MeV. No pronounced fine structure has been observed. The measured branching ratio to the first excited state falls from an average value of 0.70 between 10.3 and 14.5 MeV to an average of 0.29 between 14.5 and 18 MeV, and rises again to an average of 0.38 between 18 and 23 MeV. This behaviour can be explained by a crude theoretical model in which 1p → 2s and 1p → 1d single particle transitions dominate below 18 MeV. The calculation predicts a branching ratio of 0.50 near threshold, falling to 0.23 at higher energies, in reasonable agreement with the experiment. The integrated value of the ground-state cross section up to 23 MeV is about (38.7 ± 3.9) MeV mb, while that for the first excited state is about (17.2 ± 3.4) MeV mb. Together they account for 39% of the exchange-augmented dipole sum of 7Li.

Dynamical Fine Structure of a Quiescent Filament

1994 ◽  
Vol 144 ◽  
pp. 385-386
Author(s):  
N. Mein ◽  
P. Mein ◽  
J. E. Wiik
Keyword(s):  
Numerical Simulation ◽  
Fine Structure ◽  
Velocity Distribution ◽  
Statistical Moments ◽  
Dynamical Structure ◽  
Dynamical Characteristics ◽  
Fine Structures ◽  
Minimum Intensity ◽  
Quiescent Filament

AbstractA quiescent filament was observed in Hαby the MSDP spectrograph of the Pic-du-Midi Observatory. The dynamical structure is characterized by the statistical moments of the Dopplershift and the intensity at +/− 0.256 Å versus the minimum intensity of the profile. The fitting by a numerical simulation provides the velocity distribution of the ”threads“, and the dynamical characteristics of the underlying chromosperic fine structures.

Fine structure of P-wave velocity distribution along the Atotsugawa fault, central Japan

2009 ◽  
Vol 472 (1-4) ◽  
pp. 95-104 ◽  
Author(s):  
Takashi Iidaka ◽  
Aitaro Kato ◽  
Eiji Kurashimo ◽  
Takaya Iwasaki ◽  
Naoshi Hirata ◽  
...  
Keyword(s):  
Fine Structure ◽  
Velocity Distribution ◽  
Wave Velocity ◽  
P Wave ◽  
Central Japan ◽  
P Wave Velocity ◽  
Atotsugawa Fault

scholarly journals Catalog of fine-structured electron velocity distribution functions – Part 1: Antiparallel magnetic-field reconnection (Geospace Environmental Modeling case)

2017 ◽  
Vol 35 (5) ◽  
pp. 1051-1067 ◽  
Author(s):  
Philippe-A. Bourdin
Keyword(s):  
Fine Structure ◽  
Velocity Distribution ◽  
Initial Conditions ◽  
Sampling Site ◽  
Initial Perturbation ◽  
Environmental Modeling ◽  
Distribution Functions ◽  
Electron Velocity ◽  
Diffusion Region ◽  
Velocity Distribution Functions

Abstract. To understand the essential physics needed to reproduce magnetic reconnection events in 2.5-D particle-in-cell (PIC) simulations, we revisit the Geospace Environmental Modeling (GEM) setup. We set up a 2-D Harris current sheet (that also specifies the initial conditions) to evolve the reconnection of antiparallel magnetic fields. In contrast to the GEM setup, we use a much smaller initial perturbation to trigger the reconnection and evolve it more self-consistently. From PIC simulation data with high-quality particle statistics, we study a symmetric reconnection site, including separatrix layers, as well as the inflow and the outflow regions. The velocity distribution functions (VDFs) of electrons have a fine structure and vary strongly depending on their location within the reconnection setup. The goal is to start cataloging multidimensional fine-structured electron velocity distributions showing different reconnection processes in the Earth's magnetotail under various conditions. This will enable a direct comparison with observations from, e.g., the NASA Magnetospheric MultiScale (MMS) mission, to identify reconnection-related events. We find regions with strong non-gyrotropy also near the separatrix layer and provide a refined criterion to identify an electron diffusion region in the magnetotail. The good statistical significance of this work for relatively small analysis areas reveals the gradual changes within the fine structure of electron VDFs depending on their sampling site.

scholarly journals The Sun's gravitational quadrupole moment inferred from the fine structure of the acoustic and gravity normal mode spectra of the Sun

1986 ◽  
Vol 114 ◽  
pp. 345-354
Author(s):  
H. A. Hill ◽  
G. R. Rabaey ◽  
R. D. Rosenwald
Keyword(s):  
Magnetic Field ◽  
Fine Structure ◽  
Angular Velocity ◽  
Magnetic Fields ◽  
Velocity Distribution ◽  
Quadrupole Moment ◽  
The Sun ◽  
Upper Limits ◽  
Gravity Mode ◽  
Theories Of Gravitation

The fine structure of the acoustic and gravity mode multiplets of the Sun have been analyzed to infer the internal rotation of the Sun and upper limits of the internal magnetic field. Observed fine structure for 137 multiplets has been obtained (Hill 1984b, 1985a, 1985b) and the fine structure has been examined for dependence on the angular order, m, of the modes. The inferred angular velocity distribution, together with the estimated upper limits on the internal magnetic fields, yields a gravitational quadrupole moment, J2, of ≈7.7 × 10−6. This result is consistent with the result obtained by Hill, Bos and Goode (1982) and has important implications for planetary tests of theories of gravitation.

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