Effect of Woods-Saxon Wave Functions on Cross Sections for Charged-Pion Photoproduction fromO16

1973 ◽  
Vol 7 (5) ◽  
pp. 1785-1791 ◽  
Author(s):  
K. Srinivasa Rao
Keyword(s):  
Cross Sections ◽  
Charged Pion ◽  
Pion Photoproduction ◽  
Wave Functions

Radiative Pion Capture in Flight and Charged Pion Photoproduction in Nuclei

1974 ◽  
Vol 52 (15) ◽  
pp. 1405-1415 ◽  
Author(s):  
F. Cannata ◽  
B. A. Lamers ◽  
C. W. Lucas ◽  
A. Nagl ◽  
H. Überall ◽  
...  
Keyword(s):  
Cross Sections ◽  
Charged Pion ◽  
Giant Resonance ◽  
Forward Direction ◽  
Bound State ◽  
Pion Photoproduction ◽  
Pion Absorption ◽  
Pion Energy ◽  
Photo Production ◽  
Pion Capture

Differential and total cross sections are calculated for charged pion photoproduction and radiative pion capture in flight close to threshold [Formula: see text], mainly for a target of 12C. At the lower energies, selective bound state excitation may be studied in photo-production since the giant resonance is kinematically suppressed here. Pion absorption is found to increase considerably with decreasing pion energy due to a 1/νπ factor, and it shows a dip in the forward direction except for the 1+ state. Distortion and absorption effects on the pion are calculated, and are estimated to lead to only a small reduction of the cross section in the energy region considered.

Influence of realistic deuteron wave functions on neutral pion photoproduction cross sections

1973 ◽  
Vol 34 (8-9) ◽  
pp. 683-686 ◽  
Author(s):  
K. Srinivasa Rao ◽  
R. Parthasarathy ◽  
V. Devanathan
Keyword(s):  
Cross Sections ◽  
Neutral Pion ◽  
Pion Photoproduction ◽  
Wave Functions

THRESHOLD NEUTRAL PION PHOTOPRODUCTION ON THE PROTON AND THE CLOUDY BAG MODEL

1994 ◽  
Vol 09 (05) ◽  
pp. 399-409 ◽  
Author(s):  
A.N. TABACHENKO
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Electric Dipole ◽  
Neutral Pion ◽  
Chiral Symmetry Breaking ◽  
Additional Term ◽  
Pion Photoproduction ◽  
Differential Cross Sections ◽  
Neutral Pions ◽  
K Matrix

The energy dependence of the electric dipole amplitude, the total and differential cross-sections of the photoproduction of neutral pions off protons near threshold is given. The amplitude of process is a sum of the LET prediction and the additional term connected with the chiral symmetry breaking interaction. The simple K-matrix calculations are used to estimate the change in the electric dipole amplitude and the total and differential cross-sections between π0p and π+n thresholds.

Method of Analysis of Charged Pion Photoproduction

1956 ◽  
Vol 104 (5) ◽  
pp. 1451-1453 ◽  
Author(s):  
Michael J. Moravcsik
Keyword(s):  
Charged Pion ◽  
Pion Photoproduction

scholarly journals Regge approach to charged pion photoproduction at invariant energies above 2 GeV

2007 ◽  
Vol 34 (1) ◽  
Author(s):  
A. Sibirtsev ◽  
J. Haidenbauer ◽  
S. Krewald ◽  
T. -S. H. Lee ◽  
U. -G. Meißner ◽  
...  
Keyword(s):  
Charged Pion ◽  
Pion Photoproduction ◽  
Regge Approach

A comparison of theory and experiment for photo-ionization cross-sections I. Neon and the elements from boron to neon

1951 ◽  
Vol 208 (1094) ◽  
pp. 408-418 ◽  
Keyword(s):  
Cross Sections ◽  
General Trend ◽  
Wave Functions ◽  
Ionization Cross ◽  
Hartree Fock ◽  
Quantal Theory ◽  
Ionization Cross Sections ◽  
Photo Ionization ◽  
Near Future ◽  
Dipole Length

The quantal theory of the continuous photo-electric absorption of radiation is briefly summarized, pàrticular attention being given to the alternative formulae available and to the accuracy to be expected in practical calculations. Detailed calculations are described for the photo-ionization cross-section of neon, a system for which it is understood that experimental data should be available in the near future. The calculation is made using Hartree-Fock wave functions and the two formulae of the dipole length and the dipole velocity. The corresponding cross-sections are found to be 5.8 and 4.4 x 10- 18 cm 2 . at the spectral head and to rise slowly with increasing frequency until a broad maximum is reached for an energy of the ejected electron of about 11 eV. A comparison is made with previous calculations on the elements from boron to neon ; the general trend of the results is discussed and improved estimates for boron and fluorine are given (10 x 10 -18 cm 2 . for boron and 4.3 x 10- 18 cm 2 . for fluorine at the spectral head).

scholarly journals Quantum electrodynamics with self-conjugated equations with spinor wave functions for fermion fields

2021 ◽  
pp. 2150086
Author(s):  
V. P. Neznamov ◽  
V. E. Shemarulin
Keyword(s):  
Cross Sections ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Quantum Electrodynamics ◽  
Lamb Shift ◽  
Wave Functions ◽  
Self Energy ◽  
Fermion Fields ◽  
Spinor Wave

Quantum electrodynamics (QED) with self-conjugated equations with spinor wave functions for fermion fields is considered. In the low order of the perturbation theory, matrix elements of some of QED physical processes are calculated. The final results coincide with cross-sections calculated in the standard QED. The self-energy of an electron and amplitudes of processes associated with determination of the anomalous magnetic moment of an electron and Lamb shift are calculated. These results agree with the results in the standard QED. Distinctive feature of the developed theory is the fact that only states with positive energies are present in the intermediate virtual states in the calculations of the electron self-energy, anomalous magnetic moment of an electron and Lamb shift. Besides, in equations, masses of particles and antiparticles have the opposite signs.

scholarly journals EXTRACTION OF RESONANCE PARAMETERS AND ROLE OF THE FINAL STATE INTERACTIONS

2014 ◽  
Vol 26 ◽  
pp. 1460082 ◽  
Author(s):  
IGOR I. STRAKOVSKY ◽  
WILLIAM J. BRISCOE ◽  
ALEXANDER E. KUDRYAVTSEV ◽  
VLADIMIR E. TARASOV
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Impulse Approximation ◽  
Pion Photoproduction ◽  
Final State ◽  
The World ◽  
Final State Interactions ◽  
Watson’S Theorem ◽  
Photoproduction Data

We present an overview of the SAID group effort to analyze new γn → π-p cross sections vs. the world database to get new multipoles and determine neutron electromagnetic couplings. The differential cross section for the processes γn → π-p was extracted from new measurements at CLAS and MAMI-B accounting for Fermi motion effects in the impulse approximation (IA) as well as NN- and πN-FSI effects beyond the IA. We evaluated results of several pion photoproduction analyses and compared πN PWA results as a constraint for analyses of pion photoproduction data (Watson's theorem).

DOUBLE PION PHOTOPRODUCTION EXPERIMENT AT LNS–TOHOKU

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2313-2316 ◽  
Author(s):  
◽  
H. KANDA ◽  
N. CHIGA ◽  
Y. FUJII ◽  
K. FUTATSUKAWA ◽  
...  
Keyword(s):  
Total Cross Section ◽  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Pion Photoproduction ◽  
Total Cross Sections ◽  
Free Proton ◽  
Double Pion ◽  
The Cross

The total cross sections for the π+π− photoproduction on the deuteron were measured in an energy range of 0.8 to 1.1 GeV. The obtained total cross section for the quasi-free π+π− photoproduction on the deuteron was about 60 % of those on the free proton. The cross section for Δ++Δ− photoproduction was derived from the non-quasi-free π+π− photoproduction events. It was smaller than the previous data.

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