Ground State Radiation Width of the 10.18 MeV, Jπ = 3−, State in 28Si Deduced From 100 MeV Proton Inelastic Scattering

1974 ◽  
Vol 52 (14) ◽  
pp. 1369-1371
Author(s):  
Y. S. Horowitz
Keyword(s):  
Angular Distribution ◽  
Differential Cross Section ◽  
Cross Section ◽  
Ground State ◽  
Transition Rates ◽  
Cross Section Data ◽  
Section Data ◽  
Proton Inelastic Scattering ◽  
State Radiation ◽  
Mev Protons

Differential cross section data for 100 MeV protons inelastically scattered from 6Li, 9Be, 12C, 24Mg, and 28Si are compared with the corresponding E2 and E3 transition rates and a strong correlation is shown to exist between (dσ/dΩ)max and Γγ0 if the shape of the proton angular distribution is characteristic of single excitation. The persistence of the correlation to transitions with Γγ0/Γγ < 0.1 allows an estimate of Γγ0 = 8.6 ± 5 × 10−4 eV for the 10.18 MeV, Jπ = 3−, level in 28Si.

scholarly journals Nucleon Resonances in the Photoproduction γp → K∗+Λ

2018 ◽  
Vol 46 ◽  
pp. 1860032
Author(s):  
F. Huang ◽  
A. C. Wang ◽  
W. L. Wang ◽  
H. Haberzettl ◽  
K. Nakayama
Keyword(s):  
Experimental Data ◽  
Angular Distribution ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Cross Section Data ◽  
Section Data ◽  
Spin Observables ◽  
Effective Lagrangian ◽  
Reaction Amplitude

The differential cross-section data from the CLAS Collaboration for [Formula: see text] have been analyzed based on an effective Lagrangian approach. The [Formula: see text]-channel [Formula: see text], [Formula: see text], [Formula: see text] exchanges, the [Formula: see text]-channel [Formula: see text] and near-threshold [Formula: see text]’s exchanges, the [Formula: see text]-channel [Formula: see text], [Formula: see text], [Formula: see text] exchanges, and the generalized contact term are considered in constructing the reaction amplitude. It is found that by including the [Formula: see text] resonance, which is responsible for the shape of the angular distribution of [Formula: see text] near the [Formula: see text] threshold, and one of the [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] resonances, one can describe the cross-section data for this reaction reasonably well. More experimental data on spin observables are needed to further pin down the resonance contents and associated resonance parameters in this reaction.

scholarly journals Spatial Non-uniformity in Discharges in Low Pressure Helium and Neon

1987 ◽  
Vol 40 (3) ◽  
pp. 383 ◽  
Author(s):  
J Fletcher ◽  
PH Purdie
Keyword(s):  
Monte Carlo Simulation ◽  
Cross Section ◽  
Cross Sections ◽  
Ground State ◽  
Low Pressure ◽  
Photon Flux ◽  
Cross Section Data ◽  
Section Data ◽  
Neon Gas ◽  
Wavelength Distribution

Low current, low pressure, steady state Townsend discharges in helium and neon gas have been investigated using the photon flux technique. Such discharges have been found to exhibit spatial non-uniformity resulting in luminous layers throughout the discharge. The separation and structure of these layers has been investigated experimentally in both gases along with the wavelength distribution of the photon flux. A Monte Carlo simulation of the discharge in neon has been used to gain information on the cross sections necessary to describe these discharges. It is found that direct excitaton of ground state atoms to the resonance level of each gas is less than indicated by some published cross section data.

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