scholarly journals Compton scattering from the deuteron above pion-production threshold

2018 ◽  
Vol 98 (1) ◽  
Author(s):  
B. Strandberg ◽  
J. R. M. Annand ◽  
W. Briscoe ◽  
J. Brudvik ◽  
F. Cividini ◽  
...  
Keyword(s):  
Compton Scattering ◽  
Pion Production ◽  
Production Threshold ◽  
Pion Production Threshold

Polarization of the Recoil Proton for Proton Compton Scattering Below the Pion Production Threshold

1972 ◽  
Vol 27 (3) ◽  
pp. 488-490
Author(s):  
H Fengler
Keyword(s):  
Compton Scattering ◽  
Entire Range ◽  
Pion Production ◽  
Recoil Proton ◽  
Second Order ◽  
Unitarity Condition ◽  
Production Threshold ◽  
Pion Production Threshold ◽  
The One ◽  
Compton Amplitude

AbstractThe polarization of the recoil proton for Compton scattering on protons below the pion production threshold, which arises from fourth order Feynman diagrams, is calculated by using the second order Compton amplitude in the unitarity condition. It is assumed that the second order amplitude can be approximated by the one proton intermediate state contribution. The polarization does not exceed 0.1% in the entire range of the scattering angle.

scholarly journals Compton scattering from the deuteron below pion-production threshold

2015 ◽  
Vol 92 (2) ◽  
Author(s):  
L. S. Myers ◽  
J. R. M. Annand ◽  
J. Brudvik ◽  
G. Feldman ◽  
K. G. Fissum ◽  
...  
Keyword(s):  
Compton Scattering ◽  
Pion Production ◽  
Production Threshold ◽  
Pion Production Threshold

scholarly journals Scalar dipole dynamical polarizabilities from real Compton scattering data

2019 ◽  
Vol 199 ◽  
pp. 05008
Author(s):  
S. Sconfietti ◽  
B. Pasquini ◽  
P. Pedroni
Keyword(s):  
Compton Scattering ◽  
Pion Production ◽  
Scattering Amplitude ◽  
Parametric Bootstrap ◽  
Multipole Expansion ◽  
Scattering Data ◽  
Data Sets ◽  
Production Threshold ◽  
The Poor ◽  
Low Sensitivity

We present an extraction of the scalar dipole dynamical polarizabilities from proton real Compton scattering (RCS) data below pion-production threshold. The theoretical approach relies on dispersion relations, and on the low-energy expansion and multipole expansion of the scattering amplitude. The statistical analysis is based on the parametric bootstrap technique, that revealed to be crucial to deal with problems inherent to both the low sensitivity of the RCS cross section to the energy dependence of the dynamical polarizabilities and the poor accuracy of the available data sets.

PIONIC FUSION AT SUBTHRESHOLD ENERGIES

2009 ◽  
Vol 24 (02n03) ◽  
pp. 539-543
Author(s):  
L. JOULAEIZADEH ◽  
J. BACELAR ◽  
M. ESLAMI-KALANTARI ◽  
I. GAŠPARIĆ ◽  
N. KALANTAR-NAYESTANAKI ◽  
...  
Keyword(s):  
Cross Sections ◽  
Pion Production ◽  
Detection System ◽  
Nucleon Nucleon ◽  
Accelerator Facility ◽  
Production Threshold ◽  
Neutral Pions ◽  
Pion Production Threshold ◽  
Plastic Ball ◽  
Large Acceptance

In order to study the role of pions and clustering phenomena in nuclei, two experiments have been performed using the AGOR accelerator facility. In collisions of two nuclei a pion and a fused nucleus were produced. The examined reactions were 4He(3He, π0)7Be and 6Li(4He, π0)10B at beam energies about 10 MeV above the coherent pion production threshold (256 MeV and 236.4 MeV, respectively). Since the available energy is well below the pion production threshold in an elementary nucleon-nucleon process, a highly coherent mechanism is needed. We identified the reaction by measuring the fused system in the magnetic spectrometer and the produced neutral pions in the Plastic Ball detection system with large acceptance. Our experimental setup provided the exclusive cross sections by identifying all products in overdetermined kinematics. Here we present the preliminary results of the analysis for the second reaction. Angular distribution of neutral pions will be discussed.

A step-like rise in the 4He(γ,pn)2H cross section near the pion-production threshold

1997 ◽  
Vol 393 (3-4) ◽  
pp. 295-300 ◽  
Author(s):  
K Maruyama ◽  
K Niki ◽  
Y Sumi ◽  
T Emura ◽  
I Endo ◽  
...  
Keyword(s):  
Cross Section ◽  
Pion Production ◽  
Production Threshold ◽  
Pion Production Threshold
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