Nucleon-nucleon scattering above the pion production threshold

1979 ◽  
Vol 20 (1) ◽  
pp. 216-224 ◽  
Author(s):  
A. W. Thomas ◽  
A. S. Rinat
Keyword(s):  
Pion Production ◽  
Nucleon Nucleon ◽  
Nucleon Scattering ◽  
Production Threshold ◽  
Pion Production Threshold

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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